SOHC.co.uk Forums > CB350/400
Gearbox Stuck - The last straw?
SeanFD:
--- Quote from: McCabe-Thiele (Ted) on November 16, 2025, 03:10:50 PM ---Just trying to think outside the box, could this be caused by the retainig clip coming off the gear selector fork?
--- End quote ---
You mean inside the box, Ted? ;)
Which clip are you referring to?
Dolomite: I won't be updating too soon because I'm not going across until mid-Dec. If you've by any chance solved the problem by then, please please post the solution.
Dave: So, gasket oil seal and Hondabond. ✔️ and ✔️ and ✔️ That's No 270 on the parts fiche? 91205-333-005?
McCabe-Thiele (Ted):
When I rebuilt my 400 there was a clip on the gear selector forks inside the gearbox.
It a few years back iirc there are two shafts with selector forks on each shaft that move the gear dogs. Without the clip the selector fork just moves along the shaft thus failing to engage a gear.
If you drop the sump the clip might make it's way down there.
I might have miss remembered, I lost one of the clips on dismantling. I swept the floor, tried
a big magnet to no avail. A few weeks later I found it on the garage floor a good distance away.
Bryanj:
Anything is possible, as the engine was apart were all the thrust wazhers put back in corect places
Ken4004:
I have just seen this video for assembling of the Honda cb 750 gear change mechanism, this is of course not the Cb400 but explains the principle of operation and might be useful to somebody.
When I assembled my Cb 400 four gear change mechanism I took a lot of photos when I took it apart because I realised it was quite complicated and would be easy to make a mistake.
https://youtu.be/NdYqec2u_4U
Ken4004:
I have just found another video which again is not the CB400 four but does explain nicely the principle operation of the gear change mechanism and I think it shows the cir clip that has been mentioned earlier, again might be useful to someone.
https://youtu.be/Xtghypx8mII
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