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Old 09-09-2014, 08:10 AM   #1
hiawassee OP
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Joined: Aug 2009
Location: O-H!.....for now
Oddometer: 199
Help, please....

Trying to sort out a nagging problem on a 2001 WR426 dual sport. It runs like a beast up through 4th gear, but as soon as it hits 5th it starts "missing" or "slipping". Revs are still high and it's not a bog like the carb is gunked up. It just won't accelerate in 5th.

I recently replaced the clutch thinking it was slipping, but that didn't solve the problem.

Only thing I can think of is the teeth on the gearing are possibly worn causing the bike to lurch sporadically and the revs to race higher when accelerating in 5th. Even trying to keep a steady speed in 5th (around 50-55mph) results in deceleration on flat ground to where I have to kick it back to 4th.

Any suggestions? I do a lot of my own work, but admittedly don't have a completely tooled garage or the time, necessarily, for cracking open the case and performing surgery. Not that I wouldn't, I just want to know if my assessment is on the right track in order to minimize any more time spent fixing it.

Thanks
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'81 KZ1000 (resting in pieces)
'01 WR426F
'07 WR450F
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Old 09-09-2014, 08:28 AM   #2
vfxdog
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Have you checked your sprockets, specifically the front one?
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Old 09-09-2014, 08:56 AM   #3
hiawassee OP
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Quote:
Originally Posted by vfxdog View Post
Have you checked your sprockets, specifically the front one?
Both front and rear are relatively new with less than 500 miles on them. I re-geared before a race 2 years ago and haven't ridden it much since. 15/47 (or 48. It's been a while). I will double check the teeth though and look for excessive wear. Also the chain is well adjusted.

What's your line of thinking about the front sprocket?
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'07 WR450F
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Old 09-09-2014, 10:06 AM   #4
gonerydin
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I think you have it figured out, your 5th gear engagement rings could be slipping. This is caused by a bent/worn shift fork or worn engagement dogs. No easy fix for this, if that's your problem. This is one of the more common transmission problems.
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Old 09-09-2014, 10:31 AM   #5
hiawassee OP
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Quote:
Originally Posted by gonerydin View Post
I think you have it figured out, your 5th gear engagement rings could be slipping. This is caused by a bent/worn shift fork or worn engagement dogs. No easy fix for this, if that's your problem. This is one of the more common transmission problems.
Thx. Sounds like surgery will be unavoidable. Oh well. Ive always said that education is money well spent.
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'07 WR450F
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Old 09-16-2014, 12:01 PM   #6
hiawassee OP
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Joined: Aug 2009
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Quote:
Originally Posted by vfxdog View Post
Have you checked your sprockets, specifically the front one?
Double checked the sprockets. It's the 15/47 combo I thought it was. Front looks good. Negligible tooth wear, which is what I expect with very little mileage on it. But there does seem to be some oil seepage coming from this general area which probably means a seal has gone bad. And the back sprocket is in good shape as well.

All in all the whole thing seems like it's gonna result in cracking the case. Given the symptoms it's probably what gonerydin alluded to...bent/worn shift forks or worn engagement dogs (or both).
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