SOHC.co.uk Forums > CB350/400

Gearbox Stuck - The last straw?

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Laverda Dave:

--- Quote from: SeanFD on July 15, 2025, 05:08:27 PM ---OK, thanks.

I'll try that once I get the clutch off. Trying to find someone with a castellated socket; I'm here with 4 spanners, a screwdriver and a vise grip!  ;D

--- End quote ---

You need the correct tool to remove the clutch centre nut, it is held on really tight. You'll need to probably use a torque ratchet to get the oomph needed to loosen it and make sure you have bent the tabs back on the lock washer before attempting to undo the nut (and replace the tab washer, not worth the risk of using the old one).

SeanFD:
I've got the clutch off now - had to hire an impact wrench to remove the centre nut!

The only thing that looked amiss in the selector setup was the actuator to the end of the gear shaft; it seemed to have moved outwards and was not meshing with the pins on the drum centre.

With everything off, it looks to me as if the selector drum, when the gearbox is in "neutral" that the hole to align with the drum centre is rotated too far anti-clockwise?

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I can move the drum only about 30º and there is a positive and solid click each time it moves - I replaced the bits on the end of the drum to allow me to rotate it. It will only go anti-clockwise and I've no way of telling if different gears are actually being selected.

What next? The only thing I can think, is reassemble and see f it works!

Not feeling too hopeful here!  :(

K2-K6:
You should be able to feel the difference in ratio by turning the rear wheel, it will rotate the centre (clutch) shaft at different speed.

1st would spin that shaft fastest, 6th the slowest.

SeanFD:
It doesn't seem to change; at least not noticeably.

K2-K6:
Have you got the shift mech reassembled  ?

If so, with a mark on the outer face to show movement, it should "index" around each time the lever is used. Then obviously return to original position by going back down the ratios.

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