Topic: Smoking CB350F after rebuild

[MotoMech18]

Ive got a smoking CB350F that I've rebuilt. New rings, professional valve job, all new gaskets. Bike runs great but smokes which it did NOT do prior to rebuild. Plug #3 the only plug clean. Could I have damaged rings on install? If I need to pull apart again does anyone have a suggestion on a proper tool to compress the rings and make installing the jugs easier? Looking for suggestions. Thanks!

[markreimer]

What pistons and rings did you use? Honda or aftermarket? Was it bored out at all? If so, what clearance did you request?


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[markreimer]

Also did you verify all the rings were put in right side up?


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[MotoMech18]

I used aftermarket rings. i did not bore. I used inside micrometers on all cylinders, no cylinders out of round. I installed all top rings with the markings facing up.

[markreimer]

What brand of rings? There are many reports, myself included, of horrible smoking on 350F's when using Cruizin Image rings. I rebuild mine twice, and each time oil poured past the rings. That was both before and after a fresh valve job.

[MotoMech18]

To be honest, not sure of the brand. Whats your recommendation for rings?

[markreimer]

Are you using the stock Honda pistons? If so, buy OEM rings for sure! They can be a bit tricky to find, but they're out there. I found a set in Vancouver for about $50 when I did mine a while back.