tranny woes...

pELYgroso

pELYgroso

'Merica
Location
LEHI, UT
I lost my tranny this weekend in Moab. Luckily, I got in 2 great days of riding, and luckily I'm not road kill! We were riding the highway back from Kane Creek and I was pinned in 5th gear going about 65 and my rear wheel locked up out of nowhere. I didn't realize it until I found myself drifting, what felt like completely parallel to the road, still going 50+ mph. I have no idea how I pulled it around straight but I did and fish tailed off to the side, barely in time for the car behind me to whizz by. The skid mark must have been 300+ ft. Crazy.

Anyways, anybody worked on a tranny? I'm kinda skerd to yank it all apart. I love my bike and want to revive it ('94 WR250) but not sure which route to take here. I can buy another WR off ksl for $600-$1000 and have a parts bike, or pay a shop probably the same to fix mine, or try to do it myself and come in sub $500-ish. There's that WR500 on ksl that might be fun, but that may be a little too much bike for AF canyon-ish riding.

suggestions?
 
i've done dozens of yamaha case-splits, its easy. i'll help you out if you want, The yamahas like to eat crank bearings so now is a good time to do those too. But steve is right a donor will save you tons on the price of tranny parts. basically the rule of doing it right is, if a gear is worn/chipped you need to replace it, and the gear its dogs touch, and the fork. so even 1 damaged gear means 2-3 replacement gears, and a shift fork

that's $300.00 at the dealership

no matter what, it is always worth tearing it down, and finding the issue. you never know, it could be something less catastrophic than you think

i have a case splitting tool, but a good dead-blow hammer used correctly can split a case too.
just keep track of the shift drum detents and pauls, un-bolt the shift drum detent wheel, and the rest will pop apart a lot easier than you think, usually the trans main shaft, and counter shaft stay with all of the tranny guts in one half of the case as you lift the other half off.

you can do this
 
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also, was the engine still running? or did it die? can you pull in the clutch and get it to roll? with the shifter actuate anything?
 
Crazy!
Glad you made it home :)
I agree about getting a spare bike and doing it yourself, it's a great way to learn about your ride.
Best of luck.
 
sounds like countershaft, and/or main shaft bearing failure if it was excessively low on oil. Like maybe a shaft bearing seized. Its not common, but it happens.

just to the left of the clutch basket, and near the kick-start shaft. how does the shift mechanism look?
 
Ya, I can still pull in the clutch and it will start right up. The clutch internals look great but it will not roll more than about 1 ft. Either way. No nuetral.
 
B2-Bomber said:
i've done dozens of yamaha case-splits, its easy. i'll help you out if you want, The yamahas like to eat crank bearings so now is a good time to do those too. But steve is right a donor will save you tons on the price of tranny parts. basically the rule of doing it right is, if a gear is worn/chipped you need to replace it, and the gear its dogs touch, and the fork. so even 1 damaged gear means 2-3 replacement gears, and a shift fork

that's $300.00 at the dealership

no matter what, it is always worth tearing it down, and finding the issue. you never know, it could be something less catastrophic than you think

i have a case splitting tool, but a good dead-blow hammer used correctly can split a case too.
just keep track of the shift drum detents and pauls, un-bolt the shift drum detent wheel, and the rest will pop apart a lot easier than you think, usually the trans main shaft, and counter shaft stay with all of the tranny guts in one half of the case as you lift the other half off.

you can do this
Click to expand...

I may just take you up on your offer to give me a hand with this. I'd love to do it myself but an extra pair of more experienced eyes is always comforting to have helping!
 
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