SOHC.co.uk Forums > CB350/400

Almost finished (I think)

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CBNelly:
Hi Dave,
I read through your suggestions and wondered if any had made a particular difference
I want to do all the checks, etc. before reassembling the engine again
Like I said all my bearings seem OK but I will focus more on the clutch as noise seems more pronounced when being slipped
I've had my noise for a while and bike runs OK but always the nagging thought in the back of my head
I'll keep looking over the engine and if anything comes up I'll be sure to post
Thanks

Clem2112:
Pretty sure the "whine" is typical of straight cut gears , not sure if there are any in the driveline apart from the primary chain gear on the crank and the intermediate shaft.
Back in the day when these bikes were popular, my mate's f1 was very whiney in 1st but had a very sweet engine that revved well past 10,000.

My only evidence for what is the likely cause of the noise :-
Mini Coopers had straight cut gears in the box and were very whiney / noisy.
Later Hondas had hy-vo cam chains that whined at high revs, my NC31 (400 Super Four) being one.
Gear-driven camshaft bikes like the CB-1 400 also made odd noises.

Dave487:
I think Clem2112 has got a point all the gears including the main clutch drive have straight cut teeth and the large gear on the clutch basket has a bit of play so it may not mesh correctly with the drive gear. I'm not quite sure how this can be corrected without new parts.

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