SOHC.co.uk Forums > CB350/400

Oil leak from head.

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royhall:
My 350F started leaking at the left front. I took the rocker cover off and re-torqued the bolts to a higher torque than specified in the book, about 15% over if I recall. Surprisingly, considering it had only done 600 miles from rebuild, some of the bolts had come very loose. So far after the re-torque it has not leaked (touching wood urgently  ;D ).

Athame57:

--- Quote from: Bradders on November 06, 2024, 04:59:27 PM ---Hi Athame57. My bike is an early one , I think 122. It had a top end rebuild in 2019 with a DSS gasket set and had been fine until about 6 months ago when it started leaking.

--- End quote ---
Later models had the length of the cylinder head studs revised, as to whether you can retrofit I don't know, but there will be someone here who can answer that.

Bradders:
Thanks for the replies guys.
Is it a difficult job to tackle?  My normal motorcycle repair garage didn’t want the job.  I guess they want jobs that they do quick and get on with the next one.

McCabe-Thiele (Ted):
Changing the head studs isn't an easy task, full of things that can go wrong, hopefully it's a later model 400, is there an engine number for the change of stud length?

Bradders:
Sorry Ted, I meant the gasket change. I’m not the most proficient mechanic so not sure I would tackle changing the gasket myself but my repair garage didn’t want to change the head gasket either.

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