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Old 09-30-2012, 03:23 PM   #1
PBOB OP
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Joined: Mar 2012
Location: East coast
Oddometer: 279
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...
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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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