SOHC.co.uk Forums > CB350/400

Gearbox problem

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K2-K6:
I'm not that familiar with the internal gearbox operation of the 400,  but if you have lateral movement on gearshafts or selector drum then it's possible that while in one gear it would be rattling the dogs on another ratio.

Not enough to give you a complete conflict (if it did it would break dogs or teeth) but just skimming another ratio while in first would certainly make a noise.

Given the above,  you'd have to consider if you've got a damaged tooth on one gear, that could be making a noise during torque reversal of the rear wheel driving the engine under braking.

Does look like you need to get in there for a more comprehensive look though.

florence:
Before taking the engine out you could always have a look in the clutch casing.  I once had the end of the selector drum come loose and it caused all sorts of problems and strange sounds.  This casing can be removed with the engine in the frame.  The spring on the selector thing at the end of the gear-shaft might also be a problem.

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