After watching this video and purchasing all of the Tusk tools in it, I rebuilt the top and bottom end in a 1990 Suzuki RM250 with no issues. Since then I have rebuilt a 1988 Honda CR125 and a 2002 Yamaha YZ125, saving me lots of money instead of paying for labor at a shop or dealership. Thanks RockyMounainATVMC!
have a question i have a 1997 kx 80 big wheel real fast but i seem to b aving a problem with te clutch ... the bike starts first kick but the clutch is not grabbing inside the wire moves and everything but not inside i have to power shift to ride any input will b appreciated thanks.. meaning the bike turns on i just have leave in nuetral wen its on give it a little push and pop into second and everything is else is fine.. popstart with the bike already on
when you split the cases there is a seal on the front of the engine i need one, do you have them on your site and if you do can you give me the part # so i can buy it its for a 1999 yamaha yz 250
hey i did exactly everything you did in the video to my yz250 but once i kick to start it its so hard to kick it i dont know if sumthing is stuck or wat once i kick it the kick lever stays exactly where i kick it to and doesnt come back up im in need of help im so close to putting this beast together but thats my only problem
@dmbnorthphilly - Did the crank spin smoothly when you got the cases together? I hope you used a crank puller. Retrace your steps and see what is rubbing or hitting. It could just be something with the kick start mechanism.
Quick Q' if i may!.... You changed the crank bearings and all is good but is it neccesary to change the other bearings in the crankcase for transmission at the same time or do you not need to change them as often? and also if you do need to whats the best way to go about that as i know you don't have access to the rear of them to hit them out like you do with the crank bearings??
@jaydaintith - it isn't a bad idea to change them, but they may be just fine. inspect thm for free play or signs of wear. Refer to our "motorcycle wheel bearing replacement, engine bearings removal - ATV " video for removal instructions.
hey i just rebuilt my yz250 and whe i kicked it ovr it tured on but when its on nuetral the tire keeps spinning like if its in gear. what do u think i did wrong
@paintballer2X5 - i assume it is on a stand with the tire off the ground??? This is most likely normal. There is still drag in the transmission that will move the wheels some when off the ground. It it wants to drive off on you, you may have a problem.
hi there my CR250's tranny is tweaked out. 1st slips into neutral and only 1st and 2nd were working 3,4,5 were not going in. now i tore it apart i see why 1st was slipping out into N. but the little spring loaded thing that holds the star into place show that 1st goes in halfway then slips back into N. but when its in N the bike is still in gear. now i can see the shit drum and i only find N in between 2nd and 3rd according to the Star. but all the gear are shifting thrue. Any ideas PLEASE HELP!
@Sandeep9201 - you most likely have a bad shift fork and a couple gears. you will have to split it to inspect. i am not sure about the cam mechanism you are talking about without looking it.
My cylinder is measuring 66.85mm STD is 66.4mm i am sending it to Millennium technologies in the states to have it bored and re-plated to suit a 67mm.
those tools are not essential but make the job alot easier and less chance on damaging your motor. so buy them! well worth the $250 i spent. and well built so i can see them lasting forever.
@Yamahayz2502t replace the spark plug be for you do any thing then do a compression test and spark test and clean the carb if it still doesnt start then check your stator plate timing marks
is this pretty much the same configuration on a 1993 suzuki rm125? I am in the middle of rebuilding my engine and need to get it all apart, will I need a puller and engine splitter or are there other ways of doing it?
Since I am probably going to put in shift forks and maybe drum or something else, do you have a video of how the transmission and drum/shift levers engage?
Thanks for this video, will be a huge help. I have shifting issues, not wanting to shift easily or at all. Did you use a main center case gasket ot just RTV?
@mrjata - It depends on the machine. Some bikes (most hondas) use a gasket. Some only use a sealant (most Yamahas) like yamabond 5. If the manufacture calls for a gasket, you have to use a gasket for spacing reasons.
Yes I wanted to know how much does your crank puller/installer cost I'm actually rebuilding my crankshaft assembly and one main bearing is a pain to get out on the left case also wat should I do? Your videos are super handy wit my project 01yz250 thanks !!
@dmbnorthphilly - check out our website for tool and part pricing. If the main bearing is stuck in the case, you either need to press it out or carefully pound it out.
I have a yz125 and the second gear is stuffed - to work on the transmission only would I need to remove the clutch / drive gear and all the stuff on that side of the case, or could I skip that and just split the case on the other side and remove the transmission?
@sx512 - you can split the case from the other side, but if you want to remove the transmission from the case you need to take out the stuff on the right side.
@RockyMountainATVMC thanks for the reply!!! I'm going to buy some of those tusk tools from your website now and go ahead with taking a look myself.
Also, on the 01 yz125 are you aware of anyway to swap out the 6th gear to something that will give me more top speed? I know you can can do this on the 02-05 yz250s, swapping 3-5 gears with the wr 3-5 gears....?
ok so i have a 2005 honda crf 250r. the engine was seized but i got it loose. i drained the oils and have alot of brass filings in it. what and where would that come from? and how much work am i looking at here?
@pmkfrtscvo - refer to your owner's manual for torque settings. If you are refering to the 6mm bolts on the clustch springs, it is usually 7.2 foot pounds.
@ rockymountianatvmc I have a yz80. I've had this problem for a little while, the bike starts in neutral I can put it in gear but it won't go but it's in first gear but it revs instead of pulling. I put a new clutch in what do you thank the problem can be
hi i have a question, when re-installing the crank on a KX 250, that only has threads on one side, is there a specialty tool to do this, I see you use the crank puller for this application, but how would you go about it on the KX, since the drive side is a spline drive, not a threaded piece?
@KX817 - Great question. If you have a KX with the c-clip that holds the primary gear on, I now have an adaptor that works with our crank puller. It should be in stock this week!
hey man if im in neutral and drop it into first while holding the clutch lever should it still freewheel i got this old yz100 and if im driving and press the clutch it works but if im stoped and engine is off the clutch dont work also i cant start it in first while pressing the clutch is that normal
even on the right side crank seals of 2-stroke engines with wet clutch? can an excessive quantity of grease in such a seal make it leak and let the engine suck in the gearbox oil? experienced anything like this?
hi there.i have a question.i have a 2001 2 stroke cr 250.and im trying to ship my engine together with the cage to texas.will the engine starts leaking if they put the box upside down because i didnt drain the oil?thanks.
@nicorolden - yes, it will drain out the breather. Why don't you drain the oil the best you can and then plug the breather. then put it in a heavey plastic bag as a safety measure!
Just a question though. The video doesn't show the torquing of the crank screws / bolts to the factory settings or the installation of the other gaskets is that because it's not important?
@chrisnorman83 - it is important, but every bike is different. make sure you refer to your manual. Also, some guys that do this enough have a pretty good feel for the torque they are putting on a bolt and therefore don't use a torque wrench all the time.
@RockyMountainATVMC Thanks, I have just replaced my bottom end bearings and I'm in the middle of putting my yz crank halves together and wanted to make sure also do the guys use lock tite on the crank bolts themselves?
wow, jeez man, ur like the bike gods.... i love workin on things, an i have a 89 kx80, and im putting on a new gasket bc the oils leakin....... but i was gonna take out my engine, an i got all the way down 2 pullin out the engine, an the kill switch was there.... i took the kill switch bolt off the handle bar, an im stuck on how i undo the wiring 4 the kill switch , on the main wiring system? where all the wires go, 2 the little system thing..... bc without me undo that , i cant takeitout help
@paintballing03 - thanks. your kx 80 kill switch should just plug into the wiring harness. I doubt it is hard wired in. I am confused why you need to pull that to get the engine out though. Pull your stator and spark plug wire and your engine is no longer connected to the electrical.
excellent video i just ordered my crank installer tool from rocky mountain today when it gets here in the uk i will be following your videos to complete the teardown.
Wow man, just wanted to say thanks for taking the time to show everyone how to do that. I have built several top ends but never dreamed I would attempt the crank and berrings until I watched you 20 times. I ordered all the tusk tools you mentioned, a service manual, berrings, and a Hot Rods complete crank like you said. Very nice tools and crank by the way. Now, if I only had a bike to work on....
Just kidding. The tear-down is almost complete. Thank you for your videos.
what happen if after I installed everything I dont get to shift more then 2 times the motocycle strarts up good but i just can't shit more the N and maybe 2nd or 1st , im fixing a kx 80
@BAKARDAN1 - probably, but if I have gone to the trouble of splitting the case, I will spend the money on the liquid gasket the manufacturer recommends.
i watched the whole procedure, so could i follow this procedure to do work on the yz 125 im getting? also im really new to rideing and dont know how to work on bikes so would you suggest i learn and do it?? or get someone too?? whats best for me and my bike? thanks and nice vid by the way. :)
@FratusDillon - you should learn. get a service manual and take your time to learn how to work on your own bike. most likely you will learn to do it better and save a lot of money.
My buddy has a 02 CR 125 that he crashed, landed on left side, bent the bars, subframe, left rad, etc. and soon after he was trying to get it started (no spark issue) and the engine locked up. He brought it over and we split the cases to find nothing visibly wrong with the engine/tranny at all. we should have done more diagnosing before splitting it. Do you think it is just a shift fork jumped out of the drum? or something like that? thanks
@79stingman - Yeah, I would have done more to diagnose the problem before. Do you know it was a problem in the transmission? Could the cylinder or crank have been full of gas from being laid down, locking the piston? I have never seen a shift fork jump out of the drum. if it did, you would see some seriously bent forks and most likely some ground gears (a wreck won't do it though). I am not sure what to tell you without knowing the problem. good luck!
@RockyMountainATVMC yes it is definently a tranny problem, couldnt shift through the gears and the bike wouldnt roll. One shift fork might be very slightly bent but i dont think it would affect anything. I think we are going to get new gaskets and a few other little things and reassemble piece by piece, seeing if it locks up after each one, and we will either find the problem or find nothing and hopefully it will work! thanks for replying.
Hey I have a 03 yz 250 pretty much the same bike as in the video, and I was wondering how much crank oil should I put into it in order to fill it up to the proper level? It's completle empty right now. Thanx a lot
Thanks for taking the time to put this together. I have a question: which is safer? Sweatin' in the crank (heating up the bearings and freezing the crankshaft) or using the puller tool? I have purchased the puller tool but I'm hesitant about using it since the pulling pressure would bear on the inner racing of the bearing. Should I be worried?
@plomarine - Both methods work and are safe if done right. The OE books will tell you to use a puller (They are pulled in the factory when the bikes are manufactured).
@tlbohanon - The last thing you want to do is press it in. it has to be pulled in. On a KX250 you need to heat the case half in an oven (flame eill damage internal seal) and freeze the crank. It will drop right into place.
you know what your talking about, which is more then i can say about my local dealer, where are you located, and how much would it cost to replace a yz250 crank, bearings and just check everything in the bottom end?
@mxjunkie28 - Thanks. We are located in Utah. We are a mail order/internet company for all your apparel, parts, and accessory needs. However, we don't have a service shop - just discount retail.
im bout to do the bottom end rebuild on my 2003 kx 250 are they similar to some extent i have alot of tools and stuff just have to by the splittter the crank puller/installer and clutch hub tool and also is it a good idea since its gonna be apart ne ways to replace the bearings as well as the crank or if they are good should i leave them on there
I am thinking about buying a piece of garbage, old, 125cc two stroke from craigslist so i can try to rebuild it to get some practice because i cant afford to mess up on my YZ125. Also would you recomend OEM or Wiseco pistons for a top end rebuild? Thanks, Great Vids!
Great Videos!! I am in the process of rebuilding the bottom end on my '00 YZ250 and have a question for you guys. How do you get the main transmission shaft bearing out of the left crankcase half (stator half)? The back of the bearing is covered by the case and there is no way to pound it out like the other bearings. It feels a bit rough so I'd like to replace it while I have it apart but can't seem to come up with a solution for getting it out. Any advice would be appreciated.
@Levytate - it is easy if you have the right tool. Watch our "motorcycle wheel bearing replacement" video. We actually do a transmission bearing as well.
hey u guys are awesome i'm soon going to be doing a top end rebuild for my 2007 crf150r this is ny first top end on a four stroke. I've watched your four stroke top end rebuild which was totally sweet and this 3 part series on the bottom end and i was wondering if you guys still make videos and if you do could you probaly do a top end rebuild vid of the crf150r if you can that would be awesome:)
@noodler11 - Thanks! your CRF150r will be much easier than the KTM we did in our other video. I doubt I will be doing a 150r video any time soon. Just invest in a service manual and it will be a breeze.
A good tip for reassembly is to use a zip tie on the aluminum washer that is about 6" long. You can't forget the washer as the case will not close with the zip tie end sticking out. I use orange ones. Easy to see. ={D
I watched this video about 6 months ago when I bought a bike with a blown bottom end. Decided to give it a try and my bike is still running strong. I even bought the fancy tools you got to. I now do work on my friends bikes as well. Thanks!
this was a great video. I was on the fence about getting a bike, i had really wanted one and I found a really good deal. the only issue with it is everytime it is put into second gear it pops out. The bike i'm looking at has another transmission included in the purchase price that is brand new. I was iffy and uncertain before, because i felt like it would be an overwhelming task. after watching your video, I am going to buy this bike and do this job myself. Thank- you so much for posting this.
@collinw420 - Me personally? i don't know. Depends on several things. Call a shop in your area for a better idea of what it would cost you. i can tell you it is worth doing yourself.
when u install the trans. and the shift drum is there any certain way u have to put them in? kinda like a timing or do u just drop it all in and it should shift through the gears?
@metalmillica - As long as the shift forks are lined up in the right grooves on the shift drum, you should be fine. Just make sure it rotates through the gears. you have to spin the gears so they can move into place as you are testing.
@RockyMountainATVMC well u where right about the shift cam. i wasnt too sure if thats what you where talking about at first but thats what was wrong with it and the shift pawls
have you ever had the inner race on the ingnition side become tight when using this method? i have seen them get pushed outwards slighlty making the bearing diffcult to spin becuase it has resited the pressing action and put side load on the ball bearings. is there any harm in using heat on the bearing to help it slip onto the crank to avoide this . also is this neccessary when the ignition side has a roller bearing ?
hey , iv bought case splitter from you guys,awesome tool really sturdy, maybe i shouldnt say this but
on my crank (kx125 97) , the crank installer will only work on one side, other side doesnt have threads, how do you think i should get the other case half on, the hot cold method? iv never done it, but i will try...maybe i should take it in for this half of motor...
Thanks alot. I just watched the bearing removal video, and I'll be ordering a Tusk Bearing Removal kit this week from RMATV. On another note, keep up the great work with all of your videos. I enjoy watching them all.
If the main bearings remain on the crankshaft once you split the cases, whats the best way to remove them without a hydraulic press? Do you sell a tool that will accomplish that?
Also dont forget to purchase a Clymer or manufacturers manual.
notaleg13bable 4 days ago
After watching this video and purchasing all of the Tusk tools in it, I rebuilt the top and bottom end in a 1990 Suzuki RM250 with no issues. Since then I have rebuilt a 1988 Honda CR125 and a 2002 Yamaha YZ125, saving me lots of money instead of paying for labor at a shop or dealership. Thanks RockyMounainATVMC!
notaleg13bable 4 days ago
Wow, you guys made that look super easy, but it doesn't look like it.
blazinhott112 2 weeks ago
forgot to put the crankcase dowels back in
noahlyden17 3 weeks ago
@noahlyden17 1:21
breedam 2 weeks ago
@breedam ohh you clever dog
noahlyden17 2 weeks ago
@noahlyden17 - trust me, we got them in.
RockyMountainATVMC 1 week ago
have a question i have a 1997 kx 80 big wheel real fast but i seem to b aving a problem with te clutch ... the bike starts first kick but the clutch is not grabbing inside the wire moves and everything but not inside i have to power shift to ride any input will b appreciated thanks.. meaning the bike turns on i just have leave in nuetral wen its on give it a little push and pop into second and everything is else is fine.. popstart with the bike already on
jonrod48 3 weeks ago
@jonrod48 - you need to pull the cover off and see why it isn't disengaging.
RockyMountainATVMC 1 week ago
when you split the cases there is a seal on the front of the engine i need one, do you have them on your site and if you do can you give me the part # so i can buy it its for a 1999 yamaha yz 250
Yamahayz2502t 3 weeks ago
@Yamahayz2502t - sorry so late. Yes we have the O-ring that goes between the cases on that bike. part # 1241700001.
RockyMountainATVMC 1 week ago
@RockyMountainATVMC its ok I will order it thanks for the reply
Yamahayz2502t 1 week ago
How long did this process take?
1stchoicepc 1 month ago
@1stchoicepc - longer than normal since we had to film it! With the motor out of the bike and top end off, you can do it is an hour or two.
RockyMountainATVMC 1 month ago
Thanks man your videos helped me a lot :)
1stchoicepc 1 month ago
hey i did exactly everything you did in the video to my yz250 but once i kick to start it its so hard to kick it i dont know if sumthing is stuck or wat once i kick it the kick lever stays exactly where i kick it to and doesnt come back up im in need of help im so close to putting this beast together but thats my only problem
dmbnorthphilly 2 months ago in playlist Favorite videos
@dmbnorthphilly - Did the crank spin smoothly when you got the cases together? I hope you used a crank puller. Retrace your steps and see what is rubbing or hitting. It could just be something with the kick start mechanism.
RockyMountainATVMC 2 months ago
Quick Q' if i may!.... You changed the crank bearings and all is good but is it neccesary to change the other bearings in the crankcase for transmission at the same time or do you not need to change them as often? and also if you do need to whats the best way to go about that as i know you don't have access to the rear of them to hit them out like you do with the crank bearings??
jaydaintith 2 months ago
@jaydaintith - it isn't a bad idea to change them, but they may be just fine. inspect thm for free play or signs of wear. Refer to our "motorcycle wheel bearing replacement, engine bearings removal - ATV " video for removal instructions.
RockyMountainATVMC 2 months ago
hey i just rebuilt my yz250 and whe i kicked it ovr it tured on but when its on nuetral the tire keeps spinning like if its in gear. what do u think i did wrong
paintballer2X5 2 months ago
@paintballer2X5 - i assume it is on a stand with the tire off the ground??? This is most likely normal. There is still drag in the transmission that will move the wheels some when off the ground. It it wants to drive off on you, you may have a problem.
RockyMountainATVMC 2 months ago
hi there my CR250's tranny is tweaked out. 1st slips into neutral and only 1st and 2nd were working 3,4,5 were not going in. now i tore it apart i see why 1st was slipping out into N. but the little spring loaded thing that holds the star into place show that 1st goes in halfway then slips back into N. but when its in N the bike is still in gear. now i can see the shit drum and i only find N in between 2nd and 3rd according to the Star. but all the gear are shifting thrue. Any ideas PLEASE HELP!
Sandeep9201 3 months ago
@Sandeep9201 - you most likely have a bad shift fork and a couple gears. you will have to split it to inspect. i am not sure about the cam mechanism you are talking about without looking it.
RockyMountainATVMC 3 months ago
My cylinder is measuring 66.85mm STD is 66.4mm i am sending it to Millennium technologies in the states to have it bored and re-plated to suit a 67mm.
those tools are not essential but make the job alot easier and less chance on damaging your motor. so buy them! well worth the $250 i spent. and well built so i can see them lasting forever.
Thanks again
KyleMrK 3 months ago
Good Thing this video. My Cylinder is stuff though, any advice on whether i should re-sleeve or re-plate. Personal preference?
Thx
KyleMrK 3 months ago
@KyleMrK - "My Cylinder is stuff though". I am not sure what you mean. I have had good luck with new sleeves from LA Sleeve though.
RockyMountainATVMC 3 months ago
I just blew a crank bearing and I'm wondering if all those fancy tools are necessary for replacing it?
Please answer
9lives22 3 months ago
@9lives22 - it depends on the machine. refer to your manual. In most cases you need the tools to do it right and with a lot less frustration.
RockyMountainATVMC 3 months ago
i got a yamaha yz 250 and it just got new bearings and new crank and new piston
and its harder to start is it normal y is it harder to start plz reaply fast !!!!!
Yamahayz2502t 4 months ago
@Yamahayz2502t replace the spark plug be for you do any thing then do a compression test and spark test and clean the carb if it still doesnt start then check your stator plate timing marks
crazyboyaustin 3 months ago
hey man, great vid. Im changing my 1st gear cog and shift fork on my yz250 2000 model. this vid is such a great help, thanks.
wardy1231980 4 months ago
@wardy1231980 - glad you found it helpful! thanks
RockyMountainATVMC 4 months ago
is this pretty much the same configuration on a 1993 suzuki rm125? I am in the middle of rebuilding my engine and need to get it all apart, will I need a puller and engine splitter or are there other ways of doing it?
djh0lden 4 months ago
Since I am probably going to put in shift forks and maybe drum or something else, do you have a video of how the transmission and drum/shift levers engage?
mrjata 5 months ago in playlist motos
@mrjata - i don't. when you split the engine, just pay close attention to how it is working.
RockyMountainATVMC 4 months ago
Thanks for this video, will be a huge help. I have shifting issues, not wanting to shift easily or at all. Did you use a main center case gasket ot just RTV?
mrjata 5 months ago
@mrjata - It depends on the machine. Some bikes (most hondas) use a gasket. Some only use a sealant (most Yamahas) like yamabond 5. If the manufacture calls for a gasket, you have to use a gasket for spacing reasons.
RockyMountainATVMC 5 months ago
Yes I wanted to know how much does your crank puller/installer cost I'm actually rebuilding my crankshaft assembly and one main bearing is a pain to get out on the left case also wat should I do? Your videos are super handy wit my project 01yz250 thanks !!
dmbnorthphilly 6 months ago
@dmbnorthphilly - check out our website for tool and part pricing. If the main bearing is stuck in the case, you either need to press it out or carefully pound it out.
RockyMountainATVMC 6 months ago
Hey,
I have a yz125 and the second gear is stuffed - to work on the transmission only would I need to remove the clutch / drive gear and all the stuff on that side of the case, or could I skip that and just split the case on the other side and remove the transmission?
sx512 6 months ago
@sx512 - you can split the case from the other side, but if you want to remove the transmission from the case you need to take out the stuff on the right side.
RockyMountainATVMC 6 months ago
@RockyMountainATVMC thanks for the reply!!! I'm going to buy some of those tusk tools from your website now and go ahead with taking a look myself.
Also, on the 01 yz125 are you aware of anyway to swap out the 6th gear to something that will give me more top speed? I know you can can do this on the 02-05 yz250s, swapping 3-5 gears with the wr 3-5 gears....?
sx512 6 months ago
@sx512 - sorry, I don't know of any other gear you can put in there.
RockyMountainATVMC 6 months ago
@sx512 Easiest way to change that would be to swap a sprocket out
thisidnotinuse 5 months ago
ok so i have a 2005 honda crf 250r. the engine was seized but i got it loose. i drained the oils and have alot of brass filings in it. what and where would that come from? and how much work am i looking at here?
contreeboie 7 months ago
@contreeboie - You need to split the cases and inspect the crank and tranny closely.
RockyMountainATVMC 7 months ago
@contreeboie brass colored is probably from lower connecting rod bearing. You will need to probably get a new crank or at least rebuild it
mdehait 5 months ago
This has been flagged as spam show
Stick some string on that washer to stop the gears, trust me it sucks when you drop it in the case! :)
UTAengineerUTA 7 months ago
Stick some string on that washer, trust me it sucks when you drop it in the case! :)
UTAengineerUTA 7 months ago
hi i have a cr250 (91) what is the torque settings for the clutch baskit plz?
sirdaveomac 7 months ago
@sirdaveomac - without a manual i don't know either. sorry!
RockyMountainATVMC 7 months ago
how tight do i put the clutch bolt thing that have the springs?
pmkfrtscvo 7 months ago
@pmkfrtscvo - refer to your owner's manual for torque settings. If you are refering to the 6mm bolts on the clustch springs, it is usually 7.2 foot pounds.
RockyMountainATVMC 7 months ago
i put my left case on and screwed the cases together but the gears arnt spinning what did i do wrong?
mamasboy2995 9 months ago
As a machinists and hydraulic pump/motor/gearbox repair tech
You really shouldn't load bearings like this, Why doesn't your puller slip into the case and support against the inner race? That's how I made mine.
Of course on a POS kawie the seals are alfeady in and you can't support there.
Trying to figure that one out right now
energyrail 9 months ago
@ rockymountianatvmc I have a yz80. I've had this problem for a little while, the bike starts in neutral I can put it in gear but it won't go but it's in first gear but it revs instead of pulling. I put a new clutch in what do you thank the problem can be
Bigyzillas 9 months ago
I have a 82 yamaha xj750 seca that I am going to rebuild the transmission in. Is your vid pretty much the same as the rebuild that i am about to do?
irishfan84n 10 months ago
hi i have a question, when re-installing the crank on a KX 250, that only has threads on one side, is there a specialty tool to do this, I see you use the crank puller for this application, but how would you go about it on the KX, since the drive side is a spline drive, not a threaded piece?
KX817 10 months ago
@KX817 - Great question. If you have a KX with the c-clip that holds the primary gear on, I now have an adaptor that works with our crank puller. It should be in stock this week!
RockyMountainATVMC 10 months ago
Good video and good tecnic.
ThePETACA 11 months ago
This has been flagged as spam show
hey man if im in neutral and drop it into first while holding the clutch lever should it still freewheel i got this old yz100 and if im driving and press the clutch it works but if im stoped and engine is off the clutch dont work also i cant start it in first while pressing the clutch is that normal
davison1021 11 months ago
question, how much torque do i apply to the clutch hub nut?
gekopacific 1 year ago
@gekopacific - Every bike is different. Refer to the manual for your specs.
RockyMountainATVMC 1 year ago
even on the right side crank seals of 2-stroke engines with wet clutch? can an excessive quantity of grease in such a seal make it leak and let the engine suck in the gearbox oil? experienced anything like this?
22kurgan 1 year ago
@22kurgan - it is similar.
RockyMountainATVMC 10 months ago
hey im doing this rebuild to my cr125 but i want to glassbead each cast do i need to do to get the other bearings out
UE211 1 year ago
@UE211 - yes unless you want glass beads in the bearing.
RockyMountainATVMC 10 months ago
hi,guys! i have a question - do you use any lubricant on inner surfaces of crank oil seals? thanks
22kurgan 1 year ago
@22kurgan - Yes. I always put a litle grease on them.
RockyMountainATVMC 1 year ago
hi there.i have a question.i have a 2001 2 stroke cr 250.and im trying to ship my engine together with the cage to texas.will the engine starts leaking if they put the box upside down because i didnt drain the oil?thanks.
nicorolden 1 year ago
@nicorolden - yes, it will drain out the breather. Why don't you drain the oil the best you can and then plug the breather. then put it in a heavey plastic bag as a safety measure!
RockyMountainATVMC 1 year ago
Great Video!
Just a question though. The video doesn't show the torquing of the crank screws / bolts to the factory settings or the installation of the other gaskets is that because it's not important?
Thanks,
Chris
chrisnorman83 1 year ago
@chrisnorman83 - it is important, but every bike is different. make sure you refer to your manual. Also, some guys that do this enough have a pretty good feel for the torque they are putting on a bolt and therefore don't use a torque wrench all the time.
RockyMountainATVMC 1 year ago
@RockyMountainATVMC Thanks, I have just replaced my bottom end bearings and I'm in the middle of putting my yz crank halves together and wanted to make sure also do the guys use lock tite on the crank bolts themselves?
chrisnorman83 1 year ago
@chrisnorman83 - wanted to make sure what? Unless the manual calls for the locktight, I wouldn't use it on the case bolts.
RockyMountainATVMC 1 year ago
@RockyMountainATVMC Sorry for the bad sentence! Yeah you answered my question. Cheers again for the video!
chrisnorman83 1 year ago
wow, jeez man, ur like the bike gods.... i love workin on things, an i have a 89 kx80, and im putting on a new gasket bc the oils leakin....... but i was gonna take out my engine, an i got all the way down 2 pullin out the engine, an the kill switch was there.... i took the kill switch bolt off the handle bar, an im stuck on how i undo the wiring 4 the kill switch , on the main wiring system? where all the wires go, 2 the little system thing..... bc without me undo that , i cant takeitout help
paintballing03 1 year ago
@paintballing03 - thanks. your kx 80 kill switch should just plug into the wiring harness. I doubt it is hard wired in. I am confused why you need to pull that to get the engine out though. Pull your stator and spark plug wire and your engine is no longer connected to the electrical.
RockyMountainATVMC 1 year ago
i dont understand what a bottom end rebuild is if u just take it apart and put it back together
it was helpful explaining what to do but why should i do this what should i replace just the barrings ??
andre1995ish 1 year ago
i dont understand what a bottom end rebuild is if u just take it apart and put it back together
andre1995ish 1 year ago
excellent video i just ordered my crank installer tool from rocky mountain today when it gets here in the uk i will be following your videos to complete the teardown.
MrDirtjunky 1 year ago
cheers for the video breakdown.
Pretty helpful knowing what I'm getting into if I buy an RGV250
jcotteri 1 year ago
Excellent videos! Well done.Thanks for sharing this!
cookiescotthug 1 year ago
Wow man, just wanted to say thanks for taking the time to show everyone how to do that. I have built several top ends but never dreamed I would attempt the crank and berrings until I watched you 20 times. I ordered all the tusk tools you mentioned, a service manual, berrings, and a Hot Rods complete crank like you said. Very nice tools and crank by the way. Now, if I only had a bike to work on....
Just kidding. The tear-down is almost complete. Thank you for your videos.
Kjames9951 1 year ago
@Kjames9951 - thanks a lot! I am glad it helped out.
RockyMountainATVMC 1 year ago
This has been flagged as spam show
what happen if after I installed everything I dont get to shift more then 2 times the motocycle strarts up good but i just can't shit more the N and maybe 2nd or 1st , im fixing a kx 80
cesaviles1 1 year ago
Comment removed
cesaviles1 1 year ago
Comment removed
cesaviles1 1 year ago
can i use termo silicone instead of liquid gasket???
BAKARDAN1 1 year ago
@BAKARDAN1 - probably, but if I have gone to the trouble of splitting the case, I will spend the money on the liquid gasket the manufacturer recommends.
RockyMountainATVMC 1 year ago
I have a 99 YZ 125 and just need the power valve assembly diagram, and the setting points in the case! Could you help me out on this? Thanks
wicked1k 1 year ago
@wicked1k - you can get the parts diagram on yamaha's website.
RockyMountainATVMC 1 year ago
i watched the whole procedure, so could i follow this procedure to do work on the yz 125 im getting? also im really new to rideing and dont know how to work on bikes so would you suggest i learn and do it?? or get someone too?? whats best for me and my bike? thanks and nice vid by the way. :)
FratusDillon 1 year ago
@FratusDillon - you should learn. get a service manual and take your time to learn how to work on your own bike. most likely you will learn to do it better and save a lot of money.
RockyMountainATVMC 1 year ago
@RockyMountainATVMC okay man, thanks a lot
FratusDillon 1 year ago
good
pierre100685 1 year ago
good......................
pierre100685 1 year ago
best instructional video on this subject on the web.
GatheringSticks 1 year ago
nice vids makes everything look easy (with the right tools of course) and congrats to you for explaining everything
socrati007 1 year ago
Muy bueno...saludos desde Argentina.
TheTrapjaw 1 year ago
hey nice videos, very good info, i hav a question
My buddy has a 02 CR 125 that he crashed, landed on left side, bent the bars, subframe, left rad, etc. and soon after he was trying to get it started (no spark issue) and the engine locked up. He brought it over and we split the cases to find nothing visibly wrong with the engine/tranny at all. we should have done more diagnosing before splitting it. Do you think it is just a shift fork jumped out of the drum? or something like that? thanks
79stingman 1 year ago
@79stingman - Yeah, I would have done more to diagnose the problem before. Do you know it was a problem in the transmission? Could the cylinder or crank have been full of gas from being laid down, locking the piston? I have never seen a shift fork jump out of the drum. if it did, you would see some seriously bent forks and most likely some ground gears (a wreck won't do it though). I am not sure what to tell you without knowing the problem. good luck!
RockyMountainATVMC 1 year ago
@RockyMountainATVMC yes it is definently a tranny problem, couldnt shift through the gears and the bike wouldnt roll. One shift fork might be very slightly bent but i dont think it would affect anything. I think we are going to get new gaskets and a few other little things and reassemble piece by piece, seeing if it locks up after each one, and we will either find the problem or find nothing and hopefully it will work! thanks for replying.
79stingman 1 year ago
@79stingman - Good luck. It is always a lot more difficult when the problem can't be pin-pointed.
RockyMountainATVMC 1 year ago
hello very helpful video
just wondering when installing a new crank does it have to be balanced?
thanks
gihidohe 1 year ago
@gihidohe - a new crank assembly should come ballanced. yes, being ballanced is important.
RockyMountainATVMC 1 year ago
@RockyMountainATVMC so does this mean if i buy a complete crank i can just install it
thanks
gihidohe 1 year ago
@gihidohe - correct
RockyMountainATVMC 1 year ago
Hey I have a 03 yz 250 pretty much the same bike as in the video, and I was wondering how much crank oil should I put into it in order to fill it up to the proper level? It's completle empty right now. Thanx a lot
Jr91D 1 year ago
@Jr91D lol. none its a 2 stroke
hill2t 1 year ago
@hill2t i used the wrong word i ment oil for the tranny wise ass
Jr91D 9 months ago
hellow im rebildind a yamaha 2 stroke motor on the halfs of the cases what other sealler can i use like whate kind of rtv or form a gasket
stutest2 1 year ago
@stutest2 - i am not sure. I would use what the manual recomends. In this case it was yamabond 5.
RockyMountainATVMC 1 year ago
where can i get a flywheel holder ,, the clutch hub holding tool wont work,, i need a "flywheel holder", please
TheRoy34 1 year ago
@TheRoy34 Rocky Mountain carries flywheel pullers for around $15.
tonypybus 1 year ago
what sort of assembly lube did you use
THEJBUDS 1 year ago
is this fairly similar to a 06 crf250r
TheRoy34 1 year ago
@TheRoy34 - It is fair to say that it is "fairly similar".
RockyMountainATVMC 1 year ago
Thanks for taking the time to put this together. I have a question: which is safer? Sweatin' in the crank (heating up the bearings and freezing the crankshaft) or using the puller tool? I have purchased the puller tool but I'm hesitant about using it since the pulling pressure would bear on the inner racing of the bearing. Should I be worried?
plomarine 1 year ago
@plomarine - Both methods work and are safe if done right. The OE books will tell you to use a puller (They are pulled in the factory when the bikes are manufactured).
RockyMountainATVMC 1 year ago
Comment removed
tlbohanon 1 year ago
@tlbohanon - The last thing you want to do is press it in. it has to be pulled in. On a KX250 you need to heat the case half in an oven (flame eill damage internal seal) and freeze the crank. It will drop right into place.
RockyMountainATVMC 1 year ago
you make it look easy
dogg502 1 year ago
great videos, they helped me alot
hcglooser 1 year ago
you know what your talking about, which is more then i can say about my local dealer, where are you located, and how much would it cost to replace a yz250 crank, bearings and just check everything in the bottom end?
mxjunkie28 1 year ago
@mxjunkie28 - Thanks. We are located in Utah. We are a mail order/internet company for all your apparel, parts, and accessory needs. However, we don't have a service shop - just discount retail.
RockyMountainATVMC 1 year ago
im bout to do the bottom end rebuild on my 2003 kx 250 are they similar to some extent i have alot of tools and stuff just have to by the splittter the crank puller/installer and clutch hub tool and also is it a good idea since its gonna be apart ne ways to replace the bearings as well as the crank or if they are good should i leave them on there
durginKX 1 year ago
@durginKX - They are very similar.
RockyMountainATVMC 1 year ago
I am thinking about buying a piece of garbage, old, 125cc two stroke from craigslist so i can try to rebuild it to get some practice because i cant afford to mess up on my YZ125. Also would you recomend OEM or Wiseco pistons for a top end rebuild? Thanks, Great Vids!
ghat13 1 year ago
@ghat13 - it doesn't get much easier than a yz125. you won't mess it up. Just refer to the manual. OEm and Wiseco are good.
RockyMountainATVMC 1 year ago
Great Videos!! I am in the process of rebuilding the bottom end on my '00 YZ250 and have a question for you guys. How do you get the main transmission shaft bearing out of the left crankcase half (stator half)? The back of the bearing is covered by the case and there is no way to pound it out like the other bearings. It feels a bit rough so I'd like to replace it while I have it apart but can't seem to come up with a solution for getting it out. Any advice would be appreciated.
Levytate 1 year ago
@Levytate - it is easy if you have the right tool. Watch our "motorcycle wheel bearing replacement" video. We actually do a transmission bearing as well.
RockyMountainATVMC 1 year ago
hey u guys are awesome i'm soon going to be doing a top end rebuild for my 2007 crf150r this is ny first top end on a four stroke. I've watched your four stroke top end rebuild which was totally sweet and this 3 part series on the bottom end and i was wondering if you guys still make videos and if you do could you probaly do a top end rebuild vid of the crf150r if you can that would be awesome:)
noodler11 1 year ago
@noodler11 - Thanks! your CRF150r will be much easier than the KTM we did in our other video. I doubt I will be doing a 150r video any time soon. Just invest in a service manual and it will be a breeze.
RockyMountainATVMC 1 year ago
This was by far the best video I've seen in my life, thank you and keep them coming ;)
ps how about a vid about fuel system, carburator and timing
makimski 1 year ago
hi could you please help me, i have just bought a complete crank it is off a 94 model cr 250 will it fit my cr 250 98 model cheers, dean
juliethomas01 1 year ago
@juliethomas01 - Pro-x lists them all the same from 1992-2001.
RockyMountainATVMC 1 year ago
i have a yz 125cc my spring in it came off hoe do i fix it
TheMotocrossboys 1 year ago
@TheMotocrossboys - I don't understand the question.
RockyMountainATVMC 1 year ago
A good tip for reassembly is to use a zip tie on the aluminum washer that is about 6" long. You can't forget the washer as the case will not close with the zip tie end sticking out. I use orange ones. Easy to see. ={D
gaijin1200 1 year ago
@gaijin1200 Good idea. I never thought of that.
NAEP3K2 1 year ago
I watched this video about 6 months ago when I bought a bike with a blown bottom end. Decided to give it a try and my bike is still running strong. I even bought the fancy tools you got to. I now do work on my friends bikes as well. Thanks!
poogocker 1 year ago
what would you need to split a horizontal crankcase?
priaprism717 1 year ago
@priaprism717 - most horizontals are not pressed. It should take anything special unless your manual says otherwise.
RockyMountainATVMC 1 year ago
what are the torque specs on the hub and primary gear??
alliballillama 1 year ago
@alliballillama - depends on the machine. Refer to your service manual.
RockyMountainATVMC 1 year ago
this was a great video. I was on the fence about getting a bike, i had really wanted one and I found a really good deal. the only issue with it is everytime it is put into second gear it pops out. The bike i'm looking at has another transmission included in the purchase price that is brand new. I was iffy and uncertain before, because i felt like it would be an overwhelming task. after watching your video, I am going to buy this bike and do this job myself. Thank- you so much for posting this.
priaprism717 1 year ago
@priaprism717 - glad I could help. Good luck
RockyMountainATVMC 1 year ago
Does the tusk flywheel puller fit the ltz 400? I cant find one for it on rockymountain
chino185 1 year ago
@chino185 - No. it takes a special one from Motion Pro. We sell it on our site. Part # 1177270013.
RockyMountainATVMC 1 year ago
do you absolutely have to buy these special tools in order to complete the bottom end rebuild? How long does this take you?
crf250rider6 1 year ago
@crf250rider6 - if you want to do it right - YES. it takes a few hours with practice.
RockyMountainATVMC 1 year ago
What do you recommend regarding the bolts? It looked as if you oiled them up a bit prior to installation.
Am i right?
RatRaper 1 year ago
@RatRaper - a shot of wd-40 never hurts.
RockyMountainATVMC 1 year ago
this is a very specific and clear video thanks a lot
ramonpina01 1 year ago
How much would you normally charge for this procedure? Thanks
collinw420 1 year ago
@collinw420 - Me personally? i don't know. Depends on several things. Call a shop in your area for a better idea of what it would cost you. i can tell you it is worth doing yourself.
RockyMountainATVMC 1 year ago
I put my crank in the freezer, it dropped in the bearings like butter :)
No need for force.
eamh2002 1 year ago
What exactly is the power valve and what is it's function
AjakeC1 1 year ago
I mean Honda engines BTW.
guitarfreak2105 1 year ago
@guitarfreak2105 - pretty much. no powervalve on the 500.
RockyMountainATVMC 1 year ago
Is the 250 motor basically just a smaller version of the 500 motor?
Kinda like Fords 4.6L and 5.4L engines?
guitarfreak2105 1 year ago
do u know anything about the namura pistons?
metalmillica 1 year ago
@metalmillica - not much. I can't say I have ever used one.
RockyMountainATVMC 1 year ago
when u install the trans. and the shift drum is there any certain way u have to put them in? kinda like a timing or do u just drop it all in and it should shift through the gears?
metalmillica 1 year ago
@metalmillica - As long as the shift forks are lined up in the right grooves on the shift drum, you should be fine. Just make sure it rotates through the gears. you have to spin the gears so they can move into place as you are testing.
RockyMountainATVMC 1 year ago
@RockyMountainATVMC well u where right about the shift cam. i wasnt too sure if thats what you where talking about at first but thats what was wrong with it and the shift pawls
metalmillica 1 year ago
@metalmillica
ramonpina01 1 year ago
have you ever had the inner race on the ingnition side become tight when using this method? i have seen them get pushed outwards slighlty making the bearing diffcult to spin becuase it has resited the pressing action and put side load on the ball bearings. is there any harm in using heat on the bearing to help it slip onto the crank to avoide this . also is this neccessary when the ignition side has a roller bearing ?
thanks
good video good products
WATTSWANNABE 1 year ago
@WATTSWANNABE - No I have not. This is the method all the OE manuals will recommend.
RockyMountainATVMC 1 year ago
what you think, any tips would really help, iv bought 100 in tools from you guys...and im going to buy more so help me out!...
fernhood 1 year ago
hey , iv bought case splitter from you guys,awesome tool really sturdy, maybe i shouldnt say this but
on my crank (kx125 97) , the crank installer will only work on one side, other side doesnt have threads, how do you think i should get the other case half on, the hot cold method? iv never done it, but i will try...maybe i should take it in for this half of motor...
fernhood 1 year ago
Thanks alot. I just watched the bearing removal video, and I'll be ordering a Tusk Bearing Removal kit this week from RMATV. On another note, keep up the great work with all of your videos. I enjoy watching them all.
topstar3 1 year ago
@topstar3 - Thanks!
RockyMountainATVMC 1 year ago
Just curious how much do you guys generally charge to have a complete rebuild?
cawille6694 1 year ago
@cawille6694 - we are a internet/mail order company. We actually don't offer the service. instead, we show you how.
RockyMountainATVMC 1 year ago
Alright, thanks for the video
cawille6694 1 year ago
If the main bearings remain on the crankshaft once you split the cases, whats the best way to remove them without a hydraulic press? Do you sell a tool that will accomplish that?
topstar3 1 year ago