SOHC.co.uk Forums > CB350/400
Gearbox Stuck - The last straw?
SeanFD:
when I get home, I think I have more pics of the assembly. It'll be interesting to see where it was when I put it together.
SeanFD:
Greetings,
So I've finished my wee RTW jaunt, with a rapid blast through Saudi, Kuwait, Iraq, Turkey, Greece, Italy and France.
(belfast2belfastbybike.com if anyone is interested)
Now with Xmas coming, it's time to think about the annual visit to the old homestead, where my nemesis awaits - deep breath!
To remind anyone who has memory akin to my own, I rebuilt it, rode it for a few kms. Set out on a longer ride and after less than 1 km it wouldn't shift out of 1st gear. Examination and adjustment of everything reasonably accessible - clutch, gear shift mechanism, gear change pedal ... resolved nothing. At the end a comparison of before and after photos suggested that the gear selector drum has rotated!
So the decision was put everything back in place and leave it till .... well, now. :)
The plan is to remove the engine and take the lower case off to see if I can see anything untoward. From memory (very fallible) and the parts fiche, it seems that the only parts I will need for this is a new sump gasket - assuming all is well internally.
Have I got this right? Has anyone any tips to make the task easier?
Stay well all.
Laverda Dave:
You'll need some hondabond (or similar but not instant gasket) to rejoin the cases along with plenty of clean rags to prevent any of the old gasket from dropping into the engine as you scrape it off.
If it were me and I was disturbing the final drive oil seal I would be replacing that as well, the last thing you want is weeping oil when you put it all back together. Take the lower case off slowly in case any crankshaft bearing shells stick to the crank, don't want to mix those up!
Good luck🤞
Dolomite_:
I've just had the same issue, after a 30 mile ride this morning. On the last mile when pulling away from traffic lights it wouldnt go from 1st into 2nd.
Ive done 700+ faultless miles since I rebuilt the engine in the summer of 2024.
There is a sound coming from the gearbox when I put it in 1st, hold the clutch in and spin the wheel. I cant remember if that was there before and is normal. There seems to be too much resistance when its in 1st and I spin the wheel with the clutch held in.
I'm worried that its the worse case and something has gone wrong internally but I'll take the same steps as you and take a look at the gear selector mechanism behind the clutch drum.
Hopefully you update the thread with some good news!
McCabe-Thiele (Ted):
Just trying to think outside the box, could this be caused by the retainig clip coming off the gear selector fork?
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