SOHC.co.uk Forums > CB350/400

CB350/4 Countershaft bearing.

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Gixxer-18:
Just Curious, is the countershaft bearing replaceable on a 350/4.?  There's nothing wrong with my bearing, and I'm going to reuse it.
 but I can't see how the bearing locating ring can be removed? Has anyone done it?
Is the oil seal surface ring an interference fit on the countershaft? If that's removed it then looks like the bearing and then the gear could be taken off the shaft?
How would you do it? , bearing in mind that a NOS shaft, gear, and bearing assembly is on sale for €229.00! And only four left!
Nigel.

mike the bike:
Which one is the countershaft, the clutch side or the output side?

Gixxer-18:
It's the output side, the bearing nearest the final chain sprocket.

AshimotoK0:
Think it's pressed on like the CB250/350K. On that bike initially,  the bearing and shaft were available separately but laterally only as a complete assembly due to difficulty in replacing the bearing. So, I think it can be done but you would need the right kit to do it.  my problem on one of  my CB250K engines  was not the bearing it was the collar that the oilseal fits onto. Due to a period of not being used, the surface was corroded & pitted. I had the hardness of the collar checked and it had not been surface hardened so I did consider getting it machined down to suit the the next O ring ID size, however, I got a full gearbox off eBay in superb nick for £20 so I never bothered.

mike the bike:
Do you mean that half a ring that fits into a groove?  That just fits into a groove into the crankcase and the groove in the bearing to keep the bearing in place.
It's not held in with anything as such, once the crankcases are bolted up,  it all locks into place.  Obviously it can't be removed without splitting the crankcases.

Hope this helps.

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