Problem With Fifth Gear
Posted December 14, 2004 - 11:47 AM
I replaced the clutch basket, clutch boss, friction plates and clutch plates with springs. This did not fix the problem. What could it be?
My suspicion is that fifth gear itself is damaged, or possibly a shift fork? But I don't want to crack the case until I've eliminated everything else.
Any help would be greatly appreciated.
Posted December 14, 2004 - 12:05 PM
I'd bet that one of your dogs is broken off 3rd gear. 3rd gear drives fifth.
I have a 2000 WR 400, it's got YZ Cams, an FMF Q Pipe and about 100 hours on it. For about 30 hours now it has been exhibiting an odd slipping sensation, but only in fifth gear. All the other gears pull great. It only happens under load, not when coasting.
My bike showed the exact same symptoms, and this was the result.
Posted December 14, 2004 - 01:19 PM
Posted December 15, 2004 - 12:51 AM
about $AU500 if I remeber correctly, but I changed a few other gears that were worn at the same time. Yamaha payed for all the 'broken bits' because it died the 1st day I had the bike (bought 2nd hand from a dealer)
What was the replacement cost? Is this an expensive fix?
I opted to do the work myself which was a much safer option than letting some 1st year apprentice loose on my baby.
Posted December 15, 2004 - 07:20 AM
Make sure you are using NON-Energy Conserving Oil with NO anti friction additives.
Posted December 15, 2004 - 10:02 AM
Posted December 15, 2004 - 05:33 PM
Posted December 16, 2004 - 03:13 AM
Unfortunately you arent correct on that matt. Mine was as smooth as silk in all gears, even fifth, but to the untrained rider it appeared to be slipping in 5th. If the clutch was that bad that it 'free reved' in 5th, it would be noticeably slipping in 4th aswell.
If you had a chipped or broken tooth on any of the gears, you would hear it, and feel it.Chipping and clunking away in your tranny.
You need to understand how the gearbox works to see how this can be the case. As the dogs wear, they round out. This round edge causes the gears to 'ramp out' After they have ramped out enough times, the dogs break off.
Alternateively, the dogs can just fail.
I have heard comments on this forum like 'shifting too hard without the clutch causes the gearbox failures' I think not.