SOHC.co.uk Forums > CB750

4th gear failing to engage.

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steff750:
 :o are you sure its fourth gear and not fifth gear that's not engaging,the reason i ask is, if you have left out the half noon rings that hold the gearbox bearings in place or you have used new bearings without the slots cut in them the slots are there to hold the bearings in place and stop any side movement of the gear cluster,then the main shaft will move over with bearings and the gear selector drum making the gears fail to engage  >:( bad news is engine out again you might get away with just removing lower crankcase and work on engine upside-down

Warthog1959:
We have an engine mount swivel to do that with. i didn't replace the bearings on the gear cluster. I did just get a set of selector forks and a shaft for an F2 for £22. didn't actually dismantle the gear cluster.

Is there any possibility that this is the selector drum. I have a spare used one of those also.

Warthog1959:
Sorry yes it is 4th. I've carefully counted 1 down and 2 up, then nothing.

hairygit:
Worth checking the seletor drum, also the lug on the selector fork that engages with the drum

K2-K6:
As the others say, it seems most likely to need access by splitting it but you should be able to do it in a day so still be up and running for the coming summer.

It does sound like an incorrect thrust washer/assembly mistake to have absolutely no engagement at all.

What happens if you try to get fith by clicking through without the engine running? can you get anything there and if so is there still no 4th when you come at it from that direction?

I know it's too late now, but I always click through the gears after assembly and before installing the motor. Just can't resist on bikes or cars as you can even feel any part engagement just using your hands.

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