SOHC.co.uk Forums > CB350/400

Addressing the smoking

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Johndoc:
Hi there, have not been near the 400f for months, back now to solve the smoking issue. Removed head and barrels to find a damaged scraper ring on cylinder number 1, looks like it was damaged on installation. There was also a missing circlip on the gudgeon pin!, amazingly the bore is ok but I intend to have them all honed and new rings fitted. I have a couple of questions for you experienced guys.
How can I tell if it has been rebored previously? I was thinking there would be a stamp on the piston, but can't see anything.
The other thing is I can only find 11 head washers and I suspect one of them has fallen down the cam chain channel, if this is the case could I retrieve it through the sump?
The internals of the engine do look in really great shape, virtually no wear on the cam and it also looks like new pistons. Any other advice on what I should do at this stage would be appreciated.
Thanks in advance

Bryanj:
Check for size at the gaps on the rings if only N its standard  or 25;50;75;100 are the oversizes or you will have to measure the bore.

Yes if the washer went all the way down you can remove the sump to try and find it

Johndoc:
Thanks Bryan, that is helpful, will check it shortly

Johndoc:
I measured the bores and it looks like cylinder  1 = 50.95, C2 = 51.47, C3 = 51.00 and C4 = 51.50. Is it me or does this seem strange? I am not sure what to do with this, Looks like someone has put another liner in as there are some marks at the base of it. Any advice would be gratefully received, would it be best to get the barrel into a machine shop and everything set up evenly?
Any thoughts on the 466cc big bore kit?

Bryanj:
Way to much variation to be accurate mate unless some PO has been a real b*stard and not bored all cylinders, try measuring the piston skirts that may be easier for you

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