SOHC.co.uk Forums > CB350/400

Gearbox problem

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taysidedragon:
Looking for advice on a gearbox problem I have with my 400f.
When rolling to a halt in first gear with the clutch pulled in there is a clunking sound  which appears to come from the clutch / gearbox area. It feels as if a gear or shaft is jumping out of line. It doesn't happen in any other gear and gears change up and down without any problem.
I've drained the oil and checked filters, there are no metal particles or evidence of damage. I removed and inspected the clutch and it all checks out within spec.

Is there a common problem with gearbox wear? I guess I'm going to have to split the cases to find the problem.  :(

Bryanj:
No common problem i know of; is the chain nice and free on the links as i have seen bad chains cause odd noises

Nurse Julie:
Had a seized link one time  on the Thundercat drive chain that used to make a terrible noise. If its only happening in 1st gear with the clutch in, I would think its something catching somewhere 🤔

MrDavo:
I had a strange and puzzling intermittent clunk with my CB750, which I could only hear (and feel) at slow speeds, like 'Clunk'.....................'Clunk'.....................'Clunk'

It turned out to be one of the studs holding the rear sprocket onto the hub, was slowly backing out, with the nut on, and being machined by the inside of the swinging arm.

taysidedragon:
I'll check around everywhere for the above issues. It's a fairly new chain and sprockets which have only done about 400 miles, but you never know.

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