2 Stroke Motocross YZ Engine Re Build 5 (of 5) First Re Start

[mikereyes2630]

One good rock to that pipe and say goodbye! considering that its probably held on there by just the springs and silecner, didnt see the pipe knecked to the frame, im just saying....

[banfordg]

@mikereyes2630 Well noticed, and a good point. But It was just the first heat cycle, and the pipe was braced properly before it was ridden. This was a few years ago now, I've still got the bike but it's now a 144 with an Athena top end and a PC works pipe (it's not braced properly in the video either funnily enough).

[mikereyes2630]

@banfordg thats fuckin nice bike man, never get rid of it.

[mikereyes2630]

@banfordg thats one hell of a good looking bike you got there man, keep the 2 stroke fever alive.

[stinkyfarts445]

i almost busted a nut when i saw that decal on your radiator scoop bro hahaha thats badass

[Slyder1212]

did u hear about the 98 pound weakling who went to alaska he came back a husky fucker lol sorry just reminded me of it

[davison1021]

what does it mean if i have to give it gass and crank really quickly like 5 times to start it

[pinduline]

Good work.. now it is a NEW bike!!!

[teacups1]

MAN I LUV WATCHING THIS AND HATE IT AT THE SAME TIME IF I HAD 1 OF THOSE I WOULD BE RIDING 24/7

[sideshow45]

what oil:gas ratio did you run after the rebuild for the breaking in purpose of the engine.

[banfordg]

@sideshow45 32:1's fine as long as you use a good quality synthetic oil and take it easy for the first couple of tank-fulls. Don't drop below 40:1 even when the bike's fully run in.

[sideshow45]

@banfordg ok thank you sir. :) i was going to buy a project bike, it was a 1990's suzuki frame, and a yamaha yz250 engine, but the engine must have been old because it was air cooled not liquid, like yours. do you have any idea what year the engine could've been?

[banfordg]

@sideshow45 Got to be very early 80's, 80-81 were the last of the air coolers (and the end of a golden era in my opinion). Not sure how well the two will mesh being that far apart in age, but good luck bud.. anything's possible.

I'm in the process of uploading three new vids, see my Athena 144 installation (thde bugger's broken three of my ribs so far...)

[sideshow45]

@banfordg cool good luck with yours :)

[matthewmarrs123]

@banfordg so when it's fully broken in stay at 40:1

[theleadinbrumie]

U dun a reali good job m8 well dun

got a cr 125 2003 ma self but hell tht bike is a looker

[aleks9808]

@theleadinbrumie 

[SmurfTacuIar]

pretty sick bike.... I bet your neighbors aren't happy.

btw, I would paint the plastics all black, otherwise, black and white makes it look like a mime...

[TS50ER]

No Fat Chicks, top crosser ! You gotta a love the bike you stripped down and repaired by yourself.

[Skylamarie121]

can you get front radiator shrouds ova there for a husky cr 125 1999 im from NZ cant sorce much ova here

[banfordg]

Yep, but they're not cheap. I got a set of shrouds for this about 18 months ago from these guys... huskysport co uk (sorry, can't paste links on Youtube, just add the dots!) I believe they still make the plastics somewhere in Italy as that's where the package eventually came from. The shrouds cost me £70 for the pair (I think that's about £160 of your Kiwi Dollars). Hey, by the way. I lived in Auckland for 4 years!

[Skylamarie121]

R u able to get radiator shrouds over there for a husqvarna cr125 1999 cant sorce any in NZ

[yz250fwepon]

wat do u do for your heatcylce 15 mins riding really soft and then a break to the motors cold agian and then another 15 mins riding jus getting into band and then let cool till cold agian or differnt?? please respond

[banfordg]

There are different theories about the best way to run a bike in, from gradually heating and cooling to riding like you stole it from first start. I like to start it with a little more 2-stroke than normal and run it for 10 mins until it's just about up to full temp then switch it off and leave it to cool for at least an hour. I do this three times before the first easy ride. On the first ride it's important not to over rev but equally important not to bog the engine (revs too low in high gear).

[ack1961]

an excellent set of videos...thanks for posting. they were very informative and helpful.

[andrew125cr]

Good video very helpful,i was riding my bike sunday the start making a noise like the piston was knocking off the cylender head did not sound healthy i turned it off strait away,its not locking up i started it again no noise this time but it rev very high whit no throttle and cut out,(cr 250 2007 2 stroke) any suggestions

[banfordg]

Sounds like you may have dropped a piston skirt. It's difficult to tell without having heard what you heard but it's the most likely problem. You'll ave to pull the barrel and head to confirm this but dont start it again whatever you do. If the broken skirt is still in one piece you may be lucky, but if it breaks up into fragments you'll have to split the cases to get them out (and probably have to replace all your bearings while you're at it).

[banfordg]

As for the high revs, sounds like either the throttle jammed or it ran lean. Is it possible you forgot to turn the fuel on? When a two stroke starts to run out of fuel it begins to burn lean and will start to rev higher and higher, this type of lean condition can actually cause damage to and even seize an engine. Never run your 2-stroke out of fuel.

[dundas14]

you seem to know alot about bikes, so il ask you b'cos i cant figure owt whats happening with my KX100,

whilst its running at mid to high revs its letting quite alot of water out of the overflow from the radiator, can you tell me why it keeps pissing out water? its just had all top end gaskets done and stuff, but thats the only problem with the bike.

[banfordg]

Your bike's got a thermostatic radiator cap, it's designed to release the pressure from your colling system if it overheats. As the water within your cooling system gets close to 100 degrees it begins to boil and produce steam, therefore creating pressure. The little spring in the cap is designed to be overcome when the system reacehs a certain pressure. If I was to take a wild guess I'd say that the cap seal is either worn out or damaged. There fairly cheap, just buy a new one. Easy fix!

[dundas14]

so shall i just buy a new rad cap for it?

[banfordg]

Yep, that's what I'd start with anyway.

[thekgb27]

Nice bike. I hot a 2002 yamaha yz125

[spud886]

i just watched all of your videos because i want to rebuild my bike a honda cr80 2001 before i sell it mainly because then i get more knowledge of the bike and so its done before i sell it thanks alot your a great macanic i shall watch the rest of your videos. :)

[buzzender]

i just watched all 5 of your rebuild videos, i find that type of video really interesting. i myself have a '99 yz 125, just a couple of quick questions: just out of interest, do you know if the power valve is operated according to revs or throttle? or both? and secondly, my primary drive sprocket cover/protector has a split in and is a bit of an eye-sore, do you think its worth keeping it on? i noticed you havent got one fitted, are they necessary to avoid damage or something? cheers.

[banfordg]

The powervalve operates according to your revs and is not directly linked to the throttle in any way (although of course your throttle position ultimately dictates your revs). As for your sprocket cover, there's actually two parts, one is the 'case saver' which sits behind the sprocket cover (in front of the sprocket) . You may have one of these or you may not, but it's far more important than the cover. I wouldn't worry too much about the split cover, but make sure you have a case saver!

[banfordg]

You can see the case saver around 1:29, the thin moon shaped piece of aluminium in front (left) of the sprocket. It protects your engine casing should the chain snap or come off. The sprocket cover on the other hand, both protects your ankle and stops anything from getting in to the drive sprocket.

[buzzender]

yh i thought the powervalve was of revs but not always entirely sure. im still not entirely sure what a case saver is, or if i even have one. but directly over my drive sprocket-(not infront of it), is like a little plastic cage thing, and that is split... ill have a look at my bike later and see if i have a case saver. thanks

[HondaRider2007100]

great job with everything, thats cool how you made it a hybrid. I had to rebuild my kx100 a couple months ago and its not that its hard just really takes up alot of time. But anyways nice job on rebuilding the bike and have fun riding it

[banfordg]

Cheers, wil do!

[banfordg]

Just picked bits and pieces up gradually along the way. Two strokes are easy if you just take your time and have the right tools... Cheers

[JIMIJIM]

I just watched all 5 of your vids, great work with the engine looks mint now.

I love the look of the bike, where did you get the plastics from as they dont look standard??

[banfordg]

Thanks for watching JIMIJIM. With 2-strokes, you spend as much time working on them as you do riding them (you already know this I'm sure) so I thought I'd video the work this time. I love the shape of the '99, but the catch is that they only came in really bad colours (yellow, white, and blue), Acerbis made the original plastics but Husqvarna held onto the rights so you can't get anything but the original colours. I seem to have spent half my life researching ways to re-colour bike plastics!

[yz125rider209]

a yz mounts perfectly into a husky frame??

[banfordg]

Well, let's just say it's possible! You have to transfer the pivot pin bushes from the husky engine to the YZ and a couple of other bits and pieces, but it's not that difficult. The Husky's a good rigid lightweight frame with great running gear (Brembo's etc as standard), and you can squeeze 38 - 40 HP out of the 96-98 YZ engine, plus it's easier to get parts for. It's a good combination...

[yz125rider209]

ohh i c brembo brakes r the best...idk about the looks tho but its good enough

i heard the 98-00 were best for HP?