Shaft slip? - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #1 of 4 (permalink) Old 07-16-2020, 12:59 AM Thread Starter
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Shaft slip?

I seem to be having trouble with shifting into second with power. Unless I ease it into gear, it seems to slip, then thunk! I thought it might be wheel spin but it’s not.
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post #2 of 4 (permalink) Old 07-16-2020, 08:00 AM
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Bandit, add your bike/year and location to your signature line it can help with these kinds of questions.

That said, you’re probably experiencing one of a couple things, those being either, clutch slip or being a second gear deal it may be 2nd gear itself, Yamaha seems to have had a lot of issues with this over the years. You might dump your oil and look for metal in it.

Also if your bike hasn’t been well kept with an occasional clean & greasing of the drive shaft splines you could have stripped them of as the constant vibration there causes what is called fretting (vibration induced rust) which causes the teeth of the splines to basically round off. This is a somewhat common failure on the older goldwings but I haven’t heard of any on an fjr but the mechanics of it are the same. The driveshaft fretting & clutch-slipping should affect all gears though and not just 2nd, I suspect a damaged 2nd gear, drum or fork there, dump your oil and run a magnet Through it.

Steve P
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post #3 of 4 (permalink) Old 07-16-2020, 08:33 AM
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If you shift into second under hard acceleration and it seems to jump a tooth, or worse, if already in second and it jumps out then back in, that is most likely the second gear dogs worn (doesn't take much), also possible bent shift fork. This ain't cheap if you have to pay someone to fix it... engine removal, split the cases on the bottom end, etc. Ouch labour, but the parts are under $300..
You can do it yourself if you're so inclined, if so there are a couple of old threads around somewhere....

Meanwhile, check your clutch lever bushings are good and system is bled, ensure you're doing positive shifts into second.
Driveshafts very likely OK, any grease used on them will be fine... of course, we all want the best moly paste...
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post #4 of 4 (permalink) Old 07-16-2020, 09:32 AM
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https://www.fjr-tips.org/maint/spline/spline.html


https://www.fjr-tips.org/maint/ujoint/uj.html

Ridden wet. Put up hard.

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