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Use CB Cotters is CA??

Clutch, Transmission, Drive Chain, Sprockets
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Nick
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Use CB Cotters is CA??

Post by Nick » Fri Jun 27, 2025 6:22 pm

My Dream's transmission needs offset cotters and I have a spare CB engine. Are the CB cotters the later, thicker cotters and will they work in the CA?

Tanks
Do what you've always done and you'll get what you've always had.

Nick
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Posts: 160
Joined: Thu Oct 15, 2009 2:03 am
Location: Paradise

Do the CB and CA use the same cotters?

Post by Nick » Sat Jun 28, 2025 12:22 am

In short, why does the CA have the problem of inadequate gear engagement and not the CB?
Do what you've always done and you'll get what you've always had.

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G-Man
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Re: Use CB Cotters is CA??

Post by G-Man » Sun Jun 29, 2025 5:18 am

The offset cotters are just a way of improving dog engagement by shifting the gear along the shaft a small amount.

CBs have dovetailed dogs which 'pull' the gears into engagement. CAs have straight dogs which don't have this feature...

Any axial play in the transmission caused by wear to the 14mm bush will accentuate the problem. With the cases apart you can check engagement and offset the gear accordingly. While you have the transmission apart check the amount of 'float' you have.

I make a kit which improves on that thin flange on the 14mm bush and also takes care of the area where the rollers run on the kickstart shaft.

https://www.dropbox.com/scl/fi/d5qjjemn ... wquif&dl=0
'60 C77 '60 C72 '62 C72 Dream '63 CL72
'61 CB72 '64 CB77 '65 CB160
'66 Matchless 350 '67 CL77
'67 S90 '77 CB400F

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