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Old 09-21-2017, 04:56 PM   #1
Leo_jb
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Old 09-21-2017, 05:30 PM   #2
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New-to-me YZ250

I'll try to make this short. At the Penny Pines group ride over Memorial Day weekend, CJ let me take his YZ250 out for a spin. I was hooked. As luck would have it, Eric B had a co-worker with a 2002 YZ250 that was just sitting around decomposing in his front yard. A week later I'm the very excited, somewhat shell-shocked owner of a well worn, but mostly intact, 2002 YZ250.

What follows is three months of complete disassembly and replacement of virtually all moving parts, plus some that don't move: re-plating the cylinder, all new transmission bearings, crank, piston, rims, tires, shock linkage bearings, wheel bearings, steering bearings, final drive, etc., etc. Plus all new plastics. Invested twice as much money in parts as the original purchase price. Not to mention the innumerable calls and texts to CJ for advice and tools (couldn't have done it without him). Finally finished it about two weeks ago and have taken it to Metcalf a couple of times to start re-learning how to ride a two stroke. For your entertainment, a time-lapsed video I put together of the assembly.



youtu.be/5_S63TH2QkQ
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Old 09-21-2017, 05:55 PM   #3
OaklandF4i
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Awesome job Leo! Cant wait to see it at Stonybarf.
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Old 09-21-2017, 06:25 PM   #4
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Old 09-21-2017, 06:51 PM   #5
1962siia
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Congrats Leo!! Looks awesome!
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Old 09-21-2017, 08:28 PM   #6
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Nice!
I'm about to put all the new stuff into my YZ250 engine (cases already split).
You work pretty fast, will you do mine? should only take you, what, 3 minutes?
Looks like you are making it into a trail YZ? Will you be racing it, too? More mods to come?
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Old 09-21-2017, 08:31 PM   #7
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Had not heard about this project Leo. CJ tells me 2002 is the year to have. I can't wait to see it at Stony. It will be a ripper.
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Old 09-21-2017, 08:46 PM   #8
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Awesome, I especially like the project manager early on in the video. But all that work and it's the wrong color!

Team YZ is going to shred at StonyBARF. I'm even bringing spare tubes for you know who.
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Old 09-22-2017, 08:21 AM   #9
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Ring ding ding ding, I love it! Bike looks great with the restyle kit and desert tank.
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Old 09-24-2017, 05:58 AM   #10
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You'll shoot your eye out, kid.
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Old 09-24-2017, 09:00 AM   #11
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I just had time to watch the video -loved it and she started on the 2nd kick!

If you don't need a plate or long range, there is nothing like a 220 lb. two stroke off road bike, specially if you tune it for low end torque. I can't wait to see it Leo!
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Old 09-24-2017, 10:31 AM   #12
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Quote:
Originally Posted by Leo_jb View Post

What follows is three months of complete disassembly and replacement of virtually all moving parts, plus some that don't move ...



youtu.be/5_S63TH2QkQ
... awesome video ...

I'd say that bike found a good home ...

... watch out No Whimps Trail ...
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Old 09-24-2017, 03:38 PM   #13
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Quote:
Originally Posted by SFMCjohn View Post
... awesome video ...

I'd say that bike found a good home ...

... watch out No Whimps Trail ...
I've actually dreamed of attacking the No Wimps Trail on a two stroke. Yes, I have issues. How to carry enough gas or get fueled dropped is the biggest issue to overcome. Neither easily solved. I'm not trying that trail again on the 650. Someday I'll have a smaller lighter 4T desert bike to attempt it again.
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I'm looking for 1970 or older Triumph 650 project, cheap and preferably complete. PM me if you have something - will provide it a good home.

If you think me being naked is offensive, dont look!

"You find the biggest meanest bull, chop off his balls, dangle them in front of him, then hop on his back. That should give you some reference point. Either that, or shove a shuttle rocket up your ass. Take your pick." Colin Edwards

'Cycles is a mean toy lady" Big Halsy
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Old 09-25-2017, 08:25 AM   #14
mbrick
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Second kick after a full reassembly, gotta love that!

Hope to see it at stonyford.
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Old 09-25-2017, 04:01 PM   #15
Leo_jb
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Originally Posted by onto1wheel View Post
Nice!
I'm about to put all the new stuff into my YZ250 engine (cases already split).
You work pretty fast, will you do mine? should only take you, what, 3 minutes?
Looks like you are making it into a trail YZ? Will you be racing it, too? More mods to come?
Ha! That was the assembly! All the hard work was already done!

The hardest thing you have ahead of you is trying to get the transmission and shift drum into the case. I did mine twice just to make sure I got it right, and no, it wasn't much easier the second time. Combination of skill, patience, and a little luck.

Right now I'm trying to get the suspension sorted and learn how to ride it effectively. Needless to say I need a much different riding style than with my XR400. But - it does pull surprisingly well, and I can bog it way down without stalling it thanks to the 11 oz Steahly flywheel weight. As for racing - no immediate plans, but who knows?
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