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In the middle of a cm400 build

654 Views 11 Replies 3 Participants Last post by  paulboots553
Here she is in all her assholedness. Had it bored.25 over metric not standard. Gaskets were a bitch and any ideas on setting the jug rubbers would be great. I can't get em on correctly seems too big pressed in but tight over the sleves


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the o-rings for the jugs between the cylinder and the upper case that come in the kits are 2.5 mm. You need 2mm . You can buy them online.

Bill H
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Why they are on there I dont know. I do know the sleeve and cylinder head heat and expand at different rates so maybe an oil seal. Every Honda motor from 90 cc to the 400s I have worked on had them. So I would replace them. JMHO

Bill H
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