Let's say a piston gets damaged in a 2-stroke and you want to rebuild it, do you have to hone the cylinder if it looks good? Or can you just replace the pisons as the cylinder is?
@danceGIRLIES101 It's very rare that the piston get damaged without damaging the cylinder as they are in full contact but, if so, you still need to measure the bore of the cylinder in at least 3 different spots to make sure it hasn't worn in a taper or too much in an oval before you figure out the size of piston you will need to order. if your standard piston has become too small you will need to have the cylinders bored and honed for the larger sized pistons. always hone
@danceGIRLIES101 A lot of the newer 2 stroke motors can't be honed and therefore you must send them off to a machine shop to be re-plated or resleeved.
nice vid :) i have the same engine in mine 670 :) moster power! but i was wondering, are thos hardchrome? and do you have to replace the cylinder while doing this, or only the piston?
@117nathanmyers The ring gaps should NEVER end in the same spot on the piston in any type of engine. This would result in a loss of compression. In most 2 strokes though, there is a tab where the ring gaps have to be so that they don't spin and catch a port.
@1skiinIan okay that helps. I figured they must be offset... I thought that it was weird that it looked like they ended in the same spot on the video. So they are are offset even on the 2 stroke that you are working on? watch 0:30. maybe I just need to go take one apart to really understand what you are talking about. I have obviously only worked on 4 stroke but I hope to expand to 2 stroke very soon.
@117nathanmyers i don't know it seems pretty clear to me. you can see the pin in the center of the ring gaps where they have to be when you install the cylinder over the piston. That pin stops the ring gaps from moving to a place where when they are installed could potentially catch on one of the ports in the cylinder. It doesn't matter in a 4 stroke because there are no ports in the cylinders.
Do you use gasket seal? and also, im doing a top end rebuild on my yz 85 dirtbike, would i HAVE to use a toque wrench, or would you say two fingers on a ring ended spanner would be ok?
hey, i have a question..... i have a 1997 ski-doo formula 583.. its leaking anti-freeze in between the right cylenderand the block.. what should i do to fix this?
@MegaDanTheMan1987 you're going to have to take the jugs off to see if you have a crack anywhere. if there isn't it's probably the base gasket. replace it and reassemble
@lacossanostra I'm assuming he doesn't actually know why. It is not all ways "down." It is Up or Down. The reason being that you can't imagine how fast the piston travels up and down. placing them with the gap at the top or the bottom is kind of extra insurance to keep the clip from popping out while the engine is going. It is not anything to worry about on some old thumper, mainly very high rpm engines.
i already found it out myself, its just commen sence when a piston at the turning point to from up to down or down to up the g force will be extreem high on the clip
i think it will never go wrong at a max 5000rpm engine
@1skiinIan Hey there.I've rebuilt a couple of 521 rotax motor's.These are one amazing motor.I've got the manual for this motor.In the rebuilding section it say's a good rule of thumb for keeping you jug's straight is a feeler gauge inbetween the jug's both end's and centre when torking down the jug's to keep it as straight as possible.Just thought I'd throw that out there.Chee's Bud.
@LegittGod39 no, if it's oil injected, reattach the oil injection hose and loosen the bleed bolt untill oil starts coming out of it. after that, pull over the engine with the oil injection lever wide open untill you see oil coming out of the tiney holes in the bottom of the ports (this is with the carbs off of course). also, just to make sure I always mix oil into the first tank of gas on top of the oil injection. (mix at about 100:1)
I noticed the base gasket moving around when installing the cylinder, shouldn't this have had gasket adhesive installed between crankcase and gasket? I'm asking because im getting ready to do my motor.
Hey man, just over the ex. ports on that engine there are two black plastic circular covers clipped on. Are they some kind of ice up plug? Sorry if it's a silly question, I'm more familiar with bike engines.
@ballockybill they are power valves. dirt bikes have them too but they are internal. They are like sliding plates that close off the exhaust ports a bit and open at higher rpm so that you can still get good power and torque at lower rpm's without sacrificing high rpm power and torque.
i have a 2001 cr125r and it runs like shit, mine is always fuckin boggin when i twist the throttle real quick when im puttin around, is it supposed to do that, what could cause all this bogging??? and when i rev it out it dont sound smooth like this one does in the video, what do i need to do to make it run perfect, and smooth, and NO BOGGIN??
@impakt750 yes it's really not hard to do top end work. Just do your research. This video already gives you basics that you can use to rebuild your 125. Is it a YZ?
@1skiinIan no its a yamaha dt i already did the top end the other day and it is actualy really simple i put a wiseco forged piston in as i didnt want to let it break in the first place
@outdoorsman310 no, there are groves made in the piston. This is what I am talking about in the video. you lign the ring gaps where the notches are on the piston. You also make sure once you put the piston in that the ring gaps don't end at any ports
@KeepItRoostin658 make sure you tighten them all the same amount then, using a torque wrench, or if you are very experienced you can do a pretty good job at getting them all around the same tightness
@KeepItRoostin658 you keep doing it like that and you'll end up with a warped mating surface , every motor has been giving recommended tq specs by the factory usually a looser spec to seat the surface than the second spec to tighten the seal.
@KeepItRoostin658 I understand that but it dont mean your not playing with fire. Not to be an asshole but dont you think its just a little ignorant to ignore factory specs being that they designed and built these engines in the first place. All Im saying is you keep doing that and one day your going to tq one of your bolts down a little bit more than the other, you'll end up having to have the jug and case milled.
@KeepItRoostin658 maybe as good but certainly not better because obviously I take my time and go by the book,where as just kinda "wing it" and see what happens.Im not saying you cant build a motor,Im saying your doing it carelessly, thats all and that someday it might catch up to you.
@KeepItRoostin658 oh and when you ignore factory specs to save a little time thats called cutting corners, you can word at as you please but a turkey will always be a turkey.It might not be a big deal on these little two strokes but I dont know if you caught the sn I build Hondas as in four stroke engines with much more specific tolerances and I bet you any amount of money if you did the same thing on a fourstroke it wouldnt run nearly as long.
@KeepItRoostin658 I could almost see you tq'ing by "feel" the cam assembly on a VTEC that poor engine would grenade halfway up the street just stick to two strokes if thats how you build things,because that shit dont work when you build four strokes.
@KeepItRoostin658 but if the lazy way is how you wanna do it go ahead its not my bike. me Im going to use my head and go the safe route knowing for a fact that everything is as close to perfect as humanly possible.I guess I get a little P.O'd when ppl cut corners and get lazy because it is that mentality that has turned so many bikes into basket cases.
@B16BBOB by no means do i cut corners? i have done it like that forever its not like i dont want to take the time to do that, it wouldnt bother me one bit if i absolutely had too. but if i can do it just as good without torquing it to the exact, whats the point?
@B16BBOB when i build 4 stroke i torque every motor bolt on it, four strokes are obviously way more techniqule than 2 strokes. i can build a 4 stroke just as easy as a 2 stroke but more time costly and you have to be very careful. i can build a 2 stroke top end in under 45 minutes. and the right way. i can build a 4 stroke also, not as quick but just as good.
@haloass123 yeah, in a 4 stroke they would be. in a 2 stroke you don't have a choice. you have to lign them up with the groove on the piston and install the piston the right way so that the ring gaps are in between the ports. Typically in a 4 stroke you want to have the ring gaps 120 degrees away from eachother. In this case, they are only about 90 degrees because they didn't have a choice because of where the ports were
awesome explaination man... this is my first time rebuilding a 717 rotax 2 stroke engine from my 1997 Seadoo GTS jetski and i didnt have much idea of how emsanbling everything... i got a manual, but i still need someone watching how they do it but thank much man ! good bless you for sharing your knowlegdes with the world !
@1skiinIan That cant be, because i have a formula SS with a purple head, the only difference between the H.O. and the normal 670 is a little x underneath rotax etched in the head.
I just finished disassembling my 1993 MX 470 because the #2 piston was stuck. Using your video, I came to realize that the pistons were installed backwards by the previous owner and this caused the ring gaps to align with the exhaust port. The end result is a scored cylinder by a broken ring on #2. The #1 cylinder was also scored and the ring was already bent - caught it before it broke! Will be getting new pistons, rings and cylinders. Thanks again for the video!
@KubotaTee Thank you for that post. this proves to @DangerZONEpixel that pistons have to be installed a certain way so that the ring gaps don't end at a port
is there like a basics tutorial for rebuilding a rotax engine? I'm pretty into intermediate level car stuff but I haven't tackled a job like this before. I hear it takes about 7-8 hours? What's a good place to get quality rebuild parts?
Btw, I said "giggity" and "that's what she said" to like half the sentences you said in the video.
@iamchevyman5 go on ebay. Wiseco makes very high quality pistons. So does JE. Get forged pistons, because they are the strongest. These were wiseco in the movie. This IS a basic tutorial. Just take it apart the opposite way I put it in. You don't even have to take the engine out of the sled if you're only doing a top end job. I did the crank seals and checked bearing play in the bottom end so I didn't have a choice. It shouldn't matter how long it takes you to do it. It's not a race.
hey if i have to crank my bike many times really quick to get it started with full throttle but once started i can start it no probe for like 24 hours and yesterday full of gas started coming out of the expansion chamber near th cylender? what would you say that is bad fuel mix or spark plug?
@davison1021 Check the float and float needle in the carb. floats are getting stuck of the needle isn't sealing. It causes the bike to flood when you let it sit
@DangerZONEpixel you're joking, right? I have so many people that have brought engines to me, where they installed the pistons in the opposite way and the rings had cought on the port. IF YOUR RING GAPS END AT A PORT, THEY WILL CATCH. Warning you. It doesn't matter how precice the part is, you can still install it WRONG!
@1skiinIan first I like the vid I get bored sometimes and watch shit like this, I already know how to do a two stroke but figured Id watch anyways. Im sure you know this but there is a special pair of pliers for the piston circlips they look like needle noses with little nipples on the end when you look at the circlip you can see the two holes one on each side for compressing the clip
@1skiinIan yeah I stopped letting friends borrow my tools years ago . Every time I lent out a tool, it never returned, so I decided I cant be the local rent a center anymore lol.
@DangerZONEpixel This is correct for most engines. BUT if the gaps end at a port (by installing the piston the wrong way which is 180 degrees), it doesn't matter fuck all what degree angle your chamfer is. End of conversation. Go do everyone here a favour and google rebuilding two strokes so you can stop annoying us.
@DangerZONEpixel Dude, ever hear of expansion and contraction, yea, METAL does that...theres a chance of anything happening, including some unforeseen condition causing the rings to catch on the lip of the port. Think about it. Anything is possible..but if you want to take the chance and NOT worry about the gaps, go right ahead. And the "dumb cunt" part could have been left out, actually it SHOULD have been. Show some respect prick, i don't see you making any tutorials to help others, watch it.
not sure if it would apply here but many new rotax engines call for the head pipe to be installed befor the torquing of the cylinders to prevent leakage
@BriZav squeeze the rings with one hand and lower the cylinder over the piston. Don't force anything. Make sure you line up the ring gaps with the ring stoppers
@maxamo007 sweet lol i know of a few engines with flat ones and some with stock domes but they are really high performance and expensive. and the performance piston upgrade for those looks like they formed the top of the piston with half of a baseball. lol
@1skiinIan i have a problum i was opeing a techumas engine 2 stroke from a snowblower toke the connecting rod of the crankshaft but needle bearings fell all over the place and i dont know how to put them back cause theres no cage to hold then ? can u help me out please i dont know how to put them back on lol (they fall out)
@1skiinIan ohh dam lol i wonder why they didnt have a cage with it when i opend it weird i think ill just tell him its a waste cuz finding parts for this pieace of shit is gettin harder and harder cause they went out of business
@1skiinIan hey would u know why my 110cc atv wont start well i know that part lol theres no spark. but it cant be cdi cause it starts rarly like if i crank it for 5 mins it MIGHT start for 2-7 sec then off and wont start again.I cant get the vavle cover off to set the timin cause the screws are in a spot were its like impossible to work on this pieace of shit. would u know why iam not gettin spark all wires are good and gas is good but compression isnt that good but cant get to the vavle cover
@farisman09 Yea i think i might try the heavy grease cause i tryed looking around and like non of them seem to be the rite size cause techumseh fcked them up and also u cant even get parts for these motors
can u suggest any heavy grease i might be able to use (one things for sure iam never ever gonna touch another techumseh engine in my life) LMFAOO
if i cant get it with heavy grease i know were that engines comin ...... into the lake behind my house
Good job bro..Is it still holdin up??
GunsClap315 5 days ago
@GunsClap315 yeah of course! 1500 km's now
1skiinIan 4 days ago
Very helpfull video for all 2 stroke engines, it's basicly the same.
HendroitI 1 week ago
Let's say a piston gets damaged in a 2-stroke and you want to rebuild it, do you have to hone the cylinder if it looks good? Or can you just replace the pisons as the cylinder is?
danceGIRLIES101 2 weeks ago
@danceGIRLIES101 It's very rare that the piston get damaged without damaging the cylinder as they are in full contact but, if so, you still need to measure the bore of the cylinder in at least 3 different spots to make sure it hasn't worn in a taper or too much in an oval before you figure out the size of piston you will need to order. if your standard piston has become too small you will need to have the cylinders bored and honed for the larger sized pistons. always hone
1skiinIan 2 weeks ago
@1skiinIan when you replace pistons and/or rings
1skiinIan 2 weeks ago
@danceGIRLIES101 A lot of the newer 2 stroke motors can't be honed and therefore you must send them off to a machine shop to be re-plated or resleeved.
SkinnySkinch 2 weeks ago
rotax austria power!
abobiso 2 weeks ago
I don't need new nuts lol
gunshow2323 3 weeks ago
is this the engine used in lynx rave?
loller25 3 weeks ago
Just did a fresh top end on my 787 SeaDoo Rotax, 0.040 over.
classicoutboards 1 month ago
nice vid :) i have the same engine in mine 670 :) moster power! but i was wondering, are thos hardchrome? and do you have to replace the cylinder while doing this, or only the piston?
plzb4nd0z 1 month ago
but on a 4 stroke you never want to line up the gaps in the rings... I guess you can do that on a 2 stroke because you don't have to trap the oil.
117nathanmyers 1 month ago
@117nathanmyers The ring gaps should NEVER end in the same spot on the piston in any type of engine. This would result in a loss of compression. In most 2 strokes though, there is a tab where the ring gaps have to be so that they don't spin and catch a port.
1skiinIan 1 month ago
@1skiinIan okay that helps. I figured they must be offset... I thought that it was weird that it looked like they ended in the same spot on the video. So they are are offset even on the 2 stroke that you are working on? watch 0:30. maybe I just need to go take one apart to really understand what you are talking about. I have obviously only worked on 4 stroke but I hope to expand to 2 stroke very soon.
117nathanmyers 1 month ago
@117nathanmyers i don't know it seems pretty clear to me. you can see the pin in the center of the ring gaps where they have to be when you install the cylinder over the piston. That pin stops the ring gaps from moving to a place where when they are installed could potentially catch on one of the ports in the cylinder. It doesn't matter in a 4 stroke because there are no ports in the cylinders.
1skiinIan 1 month ago
@1skiinIan Okay... I understand now. thanks.
117nathanmyers 1 month ago
@117nathanmyers 4 smokers are totally different ball game than 2 stroke engines. 4 stompers need more maintenance. long live the 2 strokes.
pualsharkfella 1 month ago
Do you use gasket seal? and also, im doing a top end rebuild on my yz 85 dirtbike, would i HAVE to use a toque wrench, or would you say two fingers on a ring ended spanner would be ok?
dmainesYZ85 1 month ago
@dmainesYZ85 you have to use a torque wrench and you have to use new gaskets
1skiinIan 1 month ago
@1skiinIan thanks, i new you needed new gaskets, but do you need to use any sort of gasket seal aswell?
dmainesYZ85 1 month ago
@dmainesYZ85 I usually never do. just make sure the surface is clean and smooth
1skiinIan 1 month ago
@1skiinIan thanks for the advice, i appreciate it(:
dmainesYZ85 1 month ago
Oil hurts your stomach and insides.
mrf1102 2 months ago
hey, i have a question..... i have a 1997 ski-doo formula 583.. its leaking anti-freeze in between the right cylenderand the block.. what should i do to fix this?
MegaDanTheMan1987 2 months ago
@MegaDanTheMan1987 you're going to have to take the jugs off to see if you have a crack anywhere. if there isn't it's probably the base gasket. replace it and reassemble
1skiinIan 1 month ago
Actually...I'm going to put a cloth on here so that nothing falls. cause if we do that were pretty fucked
echo41911709 2 months ago 15
why do you have to assamble a piston clip facing down always!!??
lacossanostra 2 months ago
@lacossanostra I'm assuming he doesn't actually know why. It is not all ways "down." It is Up or Down. The reason being that you can't imagine how fast the piston travels up and down. placing them with the gap at the top or the bottom is kind of extra insurance to keep the clip from popping out while the engine is going. It is not anything to worry about on some old thumper, mainly very high rpm engines.
kaseycoleman993 2 months ago
@kaseycoleman993
thanks for the explaination
i already found it out myself, its just commen sence when a piston at the turning point to from up to down or down to up the g force will be extreem high on the clip
i think it will never go wrong at a max 5000rpm engine
it wouldt go wrong on a 8000 to 12000rpm engines
what do you think!
lacossanostra 2 months ago
@kaseycoleman993 don't assume anything. I just don't live on youtube and facebook like the rest of the world I guess...
1skiinIan 1 month ago
Thanks man helped me a lot! :)
BrandFan9 2 months ago
ROTAX =MONSTER POWER
steveo8776 2 months ago 10
@steveo8776 They really do. From an engine first produced in the late 80's, the 670 is still up there power wise even today.
I'm definately a fan
1skiinIan 2 months ago
My derbi needs that cylinder then i can win my dads GSX :)
Danoxify 2 months ago
what type of oil are you using? is it ok if i just use something like wd40? or is that too liquid-y??
ryjack26 3 months ago
@ryjack26
Use 2-stroke oil to be safe. It was designed to go in your cylinder anyway. Also WD40 is a water displacer, not a lubricant.
zanuha 3 months ago
oukey:D is it hard to install? and how many hp it gives i mean that new piston?
morominaolenmina 4 months ago
Yeas what sizi is that piston? 670 cc engine piston??
morominaolenmina 4 months ago
What cc piston?:)
morominaolenmina 4 months ago
@morominaolenmina you mean what overbore?
1skiinIan 4 months ago
@1skiinIan 1-2 hp. it's only 20 thousands of an inch
1skiinIan 4 months ago
@1skiinIan Hey there.I've rebuilt a couple of 521 rotax motor's.These are one amazing motor.I've got the manual for this motor.In the rebuilding section it say's a good rule of thumb for keeping you jug's straight is a feeler gauge inbetween the jug's both end's and centre when torking down the jug's to keep it as straight as possible.Just thought I'd throw that out there.Chee's Bud.
CrazyCurtass 2 months ago
@morominaolenmina yes 670 piston that's 0.020 overbore. The cylinder was too damaged and had to be bored out a bit
1skiinIan 4 months ago
are you using 2 stroke oil or assembly lube?
ComicalFerret 4 months ago
@ComicalFerret used lots of 2 stroke oil
1skiinIan 4 months ago
you said a little oil never hurt anything! Mmmm what about the iraq war
TheSkutty 5 months ago
@TheSkutty but I wasn't talking about the Iraq war, was I...
1skiinIan 5 months ago
@1skiinlan whay should i do before i start it. The oil will drain in the cylinders itself right
LegittGod39 5 months ago
@1skiinlan what should you do when you start it the first time. Will oil drain into the cylinders itself b4 u start it?
LegittGod39 5 months ago
@LegittGod39 no, if it's oil injected, reattach the oil injection hose and loosen the bleed bolt untill oil starts coming out of it. after that, pull over the engine with the oil injection lever wide open untill you see oil coming out of the tiney holes in the bottom of the ports (this is with the carbs off of course). also, just to make sure I always mix oil into the first tank of gas on top of the oil injection. (mix at about 100:1)
1skiinIan 5 months ago
where can you find the rotax parts? i cant find any for mine.
nate11346 5 months ago
@nate11346 skidoo or mbrp dealers. ebay, etc...
1skiinIan 5 months ago
I noticed the base gasket moving around when installing the cylinder, shouldn't this have had gasket adhesive installed between crankcase and gasket? I'm asking because im getting ready to do my motor.
1Rugbrn 6 months ago
@1Rugbrn I never have used gasket adhesive. I've never had a problem
1skiinIan 6 months ago
Really excellent video! Subbed :D
jakob2803 6 months ago
@jakob2803 thanks man
1skiinIan 6 months ago
Hey man, just over the ex. ports on that engine there are two black plastic circular covers clipped on. Are they some kind of ice up plug? Sorry if it's a silly question, I'm more familiar with bike engines.
ballockybill 6 months ago
@ballockybill they are power valves. dirt bikes have them too but they are internal. They are like sliding plates that close off the exhaust ports a bit and open at higher rpm so that you can still get good power and torque at lower rpm's without sacrificing high rpm power and torque.
good question though
thanks
1skiinIan 6 months ago
@1skiinIan Ah yes, it all becomes clear. That looks like a powerful motor, ever thought of sticking one in a bike?
ballockybill 6 months ago
@ballockybill many times, but ended up selling the bike I wanted to put it in lol
1skiinIan 6 months ago
@1skiinIan What kind of bike were you thinkin' of ? I can see a 2stroke Buell, Oh yeah!
ballockybill 6 months ago
@ballockybill I was going to make a drag bike out of my yamaha warrior, or finding a banshee with a siezed engine
1skiinIan 6 months ago
extremely well done video, best engine rebuild video that i have found on youtube
jman9061 7 months ago
lol i had the rings catch while i was driving my pocket bike and believe me it wasn't fun
ipwnr 7 months ago
Very instructional. Moves well. Good video shots. Narrative is to the point. I give it FIVE stars.
allegrobas 7 months ago
@allegrobas thanks man
1skiinIan 7 months ago
What lube did you use or oil?
gavinabcdefghi 7 months ago
@gavinabcdefghi 2 stroke oil
1skiinIan 7 months ago
how old are you??
Dave72mph 7 months ago
@Dave72mph I was 19 when I made this vid. I'm 21 now. Why?
1skiinIan 7 months ago
Ur jets need to be set right go a little smaller and ur prob going through plugs
622skate 7 months ago
unless there was a part 1 video that i missed....you didnt hone the cylinder, or check ring end gap clearance in the cylinder
ed563 8 months ago
@ed563 these cylinders came back from the machine shop bored and honed. Ring gap was checked by them too
1skiinIan 8 months ago
@honda1296 if you have them on wrong the piston would not go into the cylinder and you would not be able to complete the assembly, your fine.
RidingSausage 8 months ago
@honda1296 who knows? sometimes they last a long time and others don't even last a few minutes. make sure that arrow is pointing to the exhaust
1skiinIan 8 months ago
This has been flagged as spam show
i have a 2001 cr125r and it runs like shit, mine is always fuckin boggin when i twist the throttle real quick when im puttin around, is it supposed to do that, what could cause all this bogging??? and when i rev it out it dont sound smooth like this one does in the video, what do i need to do to make it run perfect, and smooth, and NO BOGGIN??
jeremybrown1942 8 months ago
im getting a 2-stroke 125 if the piston brakes on it do you think replacing is a job for a semi novice eg.never taken a 2-stroke apart just 4t's
impakt750 9 months ago
@impakt750 yes it's really not hard to do top end work. Just do your research. This video already gives you basics that you can use to rebuild your 125. Is it a YZ?
1skiinIan 9 months ago
@1skiinIan no its a yamaha dt i already did the top end the other day and it is actualy really simple i put a wiseco forged piston in as i didnt want to let it break in the first place
impakt750 9 months ago
@impakt750 yeah dt's are air cooled so they're very easy to do
1skiinIan 9 months ago
@1skiinIan its liquid cooled its the dtr
impakt750 9 months ago
@impakt750 ohhh ok lol. you forgot the R
1skiinIan 9 months ago
what do u use to lube? premix or just 2 stroke oil?
justinyoface911 9 months ago
@justinyoface911 yeah just 2 stroke oil
1skiinIan 9 months ago
@justinyoface911 i think he means premix because i dnt think u wanna put transmission oil in there that would be bad
XxAnthonyxX4 9 months ago
dont the rings sometimes turn when the engine is running?
outdoorsman310 10 months ago
@outdoorsman310 no, there are groves made in the piston. This is what I am talking about in the video. you lign the ring gaps where the notches are on the piston. You also make sure once you put the piston in that the ring gaps don't end at any ports
1skiinIan 10 months ago
@1skiinIan i see that now because i took apart my engine i read that in an auto book from the 80s
outdoorsman310 10 months ago
On my single cylinder two stroke i dont have to torque the head to any ft/lbs i just have to tighten them nice and snug.
KeepItRoostin658 10 months ago
@KeepItRoostin658 make sure you tighten them all the same amount then, using a torque wrench, or if you are very experienced you can do a pretty good job at getting them all around the same tightness
1skiinIan 10 months ago
@KeepItRoostin658 you keep doing it like that and you'll end up with a warped mating surface , every motor has been giving recommended tq specs by the factory usually a looser spec to seat the surface than the second spec to tighten the seal.
B16BBOB 10 months ago
@B16BBOB ive rebuilt my RM125 7 times exactly like that. not once have i had a problem of such and havent ever ruined a gasket.
KeepItRoostin658 10 months ago
@KeepItRoostin658 I understand that but it dont mean your not playing with fire. Not to be an asshole but dont you think its just a little ignorant to ignore factory specs being that they designed and built these engines in the first place. All Im saying is you keep doing that and one day your going to tq one of your bolts down a little bit more than the other, you'll end up having to have the jug and case milled.
B16BBOB 10 months ago
@B16BBOB i bet the bikes i rebuild would keep up/run as long/as good if not better than all the bikes you have rebuilt.
KeepItRoostin658 10 months ago
@KeepItRoostin658 maybe as good but certainly not better because obviously I take my time and go by the book,where as just kinda "wing it" and see what happens.Im not saying you cant build a motor,Im saying your doing it carelessly, thats all and that someday it might catch up to you.
B16BBOB 10 months ago
@KeepItRoostin658 oh and when you ignore factory specs to save a little time thats called cutting corners, you can word at as you please but a turkey will always be a turkey.It might not be a big deal on these little two strokes but I dont know if you caught the sn I build Hondas as in four stroke engines with much more specific tolerances and I bet you any amount of money if you did the same thing on a fourstroke it wouldnt run nearly as long.
B16BBOB 10 months ago
@KeepItRoostin658 I could almost see you tq'ing by "feel" the cam assembly on a VTEC that poor engine would grenade halfway up the street just stick to two strokes if thats how you build things,because that shit dont work when you build four strokes.
B16BBOB 10 months ago
@KeepItRoostin658 but if the lazy way is how you wanna do it go ahead its not my bike. me Im going to use my head and go the safe route knowing for a fact that everything is as close to perfect as humanly possible.I guess I get a little P.O'd when ppl cut corners and get lazy because it is that mentality that has turned so many bikes into basket cases.
B16BBOB 10 months ago
@B16BBOB by no means do i cut corners? i have done it like that forever its not like i dont want to take the time to do that, it wouldnt bother me one bit if i absolutely had too. but if i can do it just as good without torquing it to the exact, whats the point?
KeepItRoostin658 10 months ago
@B16BBOB when i build 4 stroke i torque every motor bolt on it, four strokes are obviously way more techniqule than 2 strokes. i can build a 4 stroke just as easy as a 2 stroke but more time costly and you have to be very careful. i can build a 2 stroke top end in under 45 minutes. and the right way. i can build a 4 stroke also, not as quick but just as good.
KeepItRoostin658 10 months ago
THE PISTONE RING;S ARE FACEING THAT WAY FOR COMPRESSIONAL RESONS NOT THAT
haloass123 10 months ago
@haloass123 yeah, in a 4 stroke they would be. in a 2 stroke you don't have a choice. you have to lign them up with the groove on the piston and install the piston the right way so that the ring gaps are in between the ports. Typically in a 4 stroke you want to have the ring gaps 120 degrees away from eachother. In this case, they are only about 90 degrees because they didn't have a choice because of where the ports were
1skiinIan 10 months ago
awesome explaination man... this is my first time rebuilding a 717 rotax 2 stroke engine from my 1997 Seadoo GTS jetski and i didnt have much idea of how emsanbling everything... i got a manual, but i still need someone watching how they do it but thank much man ! good bless you for sharing your knowlegdes with the world !
Gatute28 11 months ago
This is from an old PRS chassis correct? Because i have a Formula SS with the purple head.
TaKeItLiKaMaN 1 year ago
@TaKeItLiKaMaN Correct! 1993 formula Mach 1 670
The purple heads are found on the 670HO (high output) engines that had a bit higher compression.
1skiinIan 1 year ago
@1skiinIan That cant be, because i have a formula SS with a purple head, the only difference between the H.O. and the normal 670 is a little x underneath rotax etched in the head.
TaKeItLiKaMaN 1 year ago
@1skiinIan Sorry to double reply, but i own both an H.O. 670 and a normal 670
TaKeItLiKaMaN 1 year ago
I just finished disassembling my 1993 MX 470 because the #2 piston was stuck. Using your video, I came to realize that the pistons were installed backwards by the previous owner and this caused the ring gaps to align with the exhaust port. The end result is a scored cylinder by a broken ring on #2. The #1 cylinder was also scored and the ring was already bent - caught it before it broke! Will be getting new pistons, rings and cylinders. Thanks again for the video!
KubotaTee 1 year ago
@KubotaTee Thank you for that post. this proves to @DangerZONEpixel that pistons have to be installed a certain way so that the ring gaps don't end at a port
1skiinIan 1 year ago
is there like a basics tutorial for rebuilding a rotax engine? I'm pretty into intermediate level car stuff but I haven't tackled a job like this before. I hear it takes about 7-8 hours? What's a good place to get quality rebuild parts?
Btw, I said "giggity" and "that's what she said" to like half the sentences you said in the video.
lol
iamchevyman5 1 year ago
@iamchevyman5 go on ebay. Wiseco makes very high quality pistons. So does JE. Get forged pistons, because they are the strongest. These were wiseco in the movie. This IS a basic tutorial. Just take it apart the opposite way I put it in. You don't even have to take the engine out of the sled if you're only doing a top end job. I did the crank seals and checked bearing play in the bottom end so I didn't have a choice. It shouldn't matter how long it takes you to do it. It's not a race.
1skiinIan 1 year ago
@iamchevyman5 So set aside a full day and do it RIGHT!
1skiinIan 1 year ago
hey if i have to crank my bike many times really quick to get it started with full throttle but once started i can start it no probe for like 24 hours and yesterday full of gas started coming out of the expansion chamber near th cylender? what would you say that is bad fuel mix or spark plug?
davison1021 1 year ago
@davison1021 Check the float and float needle in the carb. floats are getting stuck of the needle isn't sealing. It causes the bike to flood when you let it sit
1skiinIan 1 year ago
this may sound like a stupid question, but are the torque patterns the same for all sleds??
snoxgirl440 1 year ago
THAT'S HOW i learned to change my moped rings
paulius360 1 year ago
the fuckin rings wont catch on ur ports u dumb cunt. this is machined with presition. perferct round ring. It can not posibly catch.
DangerZONEpixel 1 year ago
@DangerZONEpixel you're joking, right? I have so many people that have brought engines to me, where they installed the pistons in the opposite way and the rings had cought on the port. IF YOUR RING GAPS END AT A PORT, THEY WILL CATCH. Warning you. It doesn't matter how precice the part is, you can still install it WRONG!
1skiinIan 1 year ago 5
@1skiinIan OWWWWWNNNNEEEDDDD
groundedb2200 1 year ago
This has been flagged as spam show
@1skiinIan OWWWWWNNNNEEEDDDD lol
groundedb2200 1 year ago
@1skiinIan first I like the vid I get bored sometimes and watch shit like this, I already know how to do a two stroke but figured Id watch anyways. Im sure you know this but there is a special pair of pliers for the piston circlips they look like needle noses with little nipples on the end when you look at the circlip you can see the two holes one on each side for compressing the clip
B16BBOB 10 months ago
@B16BBOB Yeah I know. I actually have the tool just hadn't gotten them back from a guy I let borrow them at the time.
1skiinIan 10 months ago
@1skiinIan yeah I stopped letting friends borrow my tools years ago . Every time I lent out a tool, it never returned, so I decided I cant be the local rent a center anymore lol.
B16BBOB 10 months ago
@B16BBOB lol yeah me too
1skiinIan 10 months ago
@DangerZONEpixel
"To prevent ring breakage, make sure all port edges are chamfered @ 30 angles with a radius of 0.9 to 1.4 mm"
so suppliers are wrong in this statement?
harvesterofsorrow899 1 year ago
@DangerZONEpixel This is correct for most engines. BUT if the gaps end at a port (by installing the piston the wrong way which is 180 degrees), it doesn't matter fuck all what degree angle your chamfer is. End of conversation. Go do everyone here a favour and google rebuilding two strokes so you can stop annoying us.
1skiinIan 1 year ago
@DangerZONEpixel Dude, ever hear of expansion and contraction, yea, METAL does that...theres a chance of anything happening, including some unforeseen condition causing the rings to catch on the lip of the port. Think about it. Anything is possible..but if you want to take the chance and NOT worry about the gaps, go right ahead. And the "dumb cunt" part could have been left out, actually it SHOULD have been. Show some respect prick, i don't see you making any tutorials to help others, watch it.
bigdog5986 1 year ago
@bigdog5986
what he said.
iamchevyman5 1 year ago
cause if we do that, we're pretty fucked lmao
shalakalakaboomboom 1 year ago
cuse if we do that, we're pretty fucked lmao
shalakalakaboomboom 1 year ago
not sure if it would apply here but many new rotax engines call for the head pipe to be installed befor the torquing of the cylinders to prevent leakage
steveothegreat2424 1 year ago
"little oil never hurt anything" haha everything except the gulf
lakelinden11 1 year ago
@lakelinden11 HAhAhaha so true
1skiinIan 1 year ago
@TheMos2818 Thanks man
1skiinIan 1 year ago
I'm having trouble getting the cylinder over the piston rings any suggestions
BriZav 1 year ago
@BriZav squeeze the rings with one hand and lower the cylinder over the piston. Don't force anything. Make sure you line up the ring gaps with the ring stoppers
1skiinIan 1 year ago
Love the video. Rebuiling a 800cc engine- first time. Could you recommend any other videos- would help
rsqr12 1 year ago
@rsqr12 Once you've rebuilt a 2 stroke, you've rebuilt them all. They're all the same
1skiinIan 1 year ago
Great video and great job on assembly.
Did you replace the crank seals too or just a top end refresh?
joesudbury 1 year ago
@joesudbury yup, seals were done too
1skiinIan 1 year ago
shouldnt the arrows on the pistons be pointed towards the exhaust.?
yoshman139 1 year ago
@yoshman139 yes, usually that's the case
1skiinIan 1 year ago
the Exhaust y pipe works too Aline too
maxamo007 1 year ago
@maxamo007 I had to get a new one because it was so worn on the joint from rubbing with the expansion chamber, so it wasn't an option
1skiinIan 1 year ago
I need to rebuild my 583. How do you get the clutch off?
yak55x 1 year ago
@yak55x You need a clutch puller
1skiinIan 1 year ago
thats a pretty engine!!! lol
did you get dome shaped pistons as a hi performance upgrade or where they dome'd stock? (my neighbors DT250 had flattops but he got a dome'd piston)
highdeserthater 1 year ago
@highdeserthater there dome Stock
maxamo007 1 year ago
@maxamo007 sweet lol i know of a few engines with flat ones and some with stock domes but they are really high performance and expensive. and the performance piston upgrade for those looks like they formed the top of the piston with half of a baseball. lol
highdeserthater 1 year ago
haha I wish I watched this before I took my John Deere 440 motor apart. now its fubar:(
airsoftkid1996 1 year ago
what did this engine go to
offspringfanman96 1 year ago
@offspringfanman96 what? 1993 mach 1 670
1skiinIan 1 year ago
@1skiinIan ohg i was confused because i only saw 1 cylinder at first but did he say it right in the video lol
offspringfanman96 1 year ago
@1skiinIan i have a problum i was opeing a techumas engine 2 stroke from a snowblower toke the connecting rod of the crankshaft but needle bearings fell all over the place and i dont know how to put them back cause theres no cage to hold then ? can u help me out please i dont know how to put them back on lol (they fall out)
Thankz
bettafish110 1 year ago
@bettafish110 techumseh engines are not worth rebuilding IMHO
1skiinIan 1 year ago
@1skiinIan yea i noticed LOL but would u know how to put the bearings back on cause i wanna put it together cause its not mines LOL its my freinds
Thankz
bettafish110 1 year ago
@bettafish110 you're gonne need to buy new needle bearings. They should come in a cage
1skiinIan 1 year ago
@1skiinIan ohh dam lol i wonder why they didnt have a cage with it when i opend it weird i think ill just tell him its a waste cuz finding parts for this pieace of shit is gettin harder and harder cause they went out of business
bettafish110 1 year ago
@bettafish110 LOL there is a reason they went out of business
1skiinIan 1 year ago
@1skiinIan yup lol fckin cheap asswholes
bettafish110 1 year ago
@1skiinIan hey would u know why my 110cc atv wont start well i know that part lol theres no spark. but it cant be cdi cause it starts rarly like if i crank it for 5 mins it MIGHT start for 2-7 sec then off and wont start again.I cant get the vavle cover off to set the timin cause the screws are in a spot were its like impossible to work on this pieace of shit. would u know why iam not gettin spark all wires are good and gas is good but compression isnt that good but cant get to the vavle cover
bettafish110 1 year ago
@bettafish110 USE A HEAVY GREASE TO HOLD THEM ON THE CONECTING ROD BUT I WOULD SPLURGE AND JUST BUY SOME CAGED BEARING FOR 25 DOLLARS
farisman09 1 year ago
@farisman09 Yea i think i might try the heavy grease cause i tryed looking around and like non of them seem to be the rite size cause techumseh fcked them up and also u cant even get parts for these motors
can u suggest any heavy grease i might be able to use (one things for sure iam never ever gonna touch another techumseh engine in my life) LMFAOO
if i cant get it with heavy grease i know were that engines comin ...... into the lake behind my house
Thankz bro
bettafish110 1 year ago
nice, pozz from croatia
MZetz301 1 year ago
Great video. I used this as a reference to rebuild my RMK 700 top end. Thanks for posting.
BrownLabRanch 1 year ago
@BrownLabRanch yeah no problem. glad to help. Nice sled btw
1skiinIan 1 year ago
good vid man
itsonlyafl3shwound 1 year ago
what are those black things your touching @ 9:41 ??
hyde20082142 1 year ago
@hyde20082142 9:41 is the end of the video... :S
1skiinIan 1 year ago
Nice video. What sort of power are you getting out of your motor ? Has it been modifiied in anyway ?
Maximusfool 1 year ago