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Old 09-30-2012, 03:23 PM   #1
PBOB's Avatar
Joined: Mar 2012
Location: East coast
Oddometer: 295
Wicked cb900c- shaft noise when engaging clutch from 1st gear

I have 2 cb900c 1982's. One of them I just bought (the red one, 16k miles, in very good condition overall, all faired and hard cased up) every so often makes a clunky/shutter noise which sounds like its coming from the shaft drive and or gears when mid clutch, taking off from 1st gear in hi range only. I dont notice it from first in low range. But bc I'm a highway guy and like better fuel economy, i leave it in high, on both bikes. My other bike (blue, 33k, 12k by me in the last yr, very good cond, and bone stock) only whims a little when going out of 1st gear hi. But this noise on ole red sounds almost like its doing a couple extra revolutions before fully engaging. I'm thinking, maybe new clutch springs, contaminated oil ( maybe they used automotive oil) or sub tran oil (maybe that's real old), or even final drive oil too old. So I changed all that with spec'd oil today. Anyway. Assuming clutch is adjusted right (which i believe it is) and oil has no positive impact over the next several hundred miles .... What could it be?
Any similar experiences of tips would be much appreciated. Note- I have read shaft on these bikes is same as old Goldwings, and they do make a lil noose or shutter, may or may not be true...
Help please old crock fans...
1982 Honda CB900c
2002 Kawasaki KL250G "Super Sherpa"
1999 Honda CN250 Helix
1995 Honda XR650L (in Shasta white and Uranus violet of course)
The list is long, I'll stop there....
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