SOHC.co.uk Forums > CB500/550

head gasket

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matthewmosse:
Not any chance one or more of the studs has partially unwound in the bottom cases? then the nut might not go past the threaded portion. other part that can snag is the camchain tensioner which needs to seat properly in the bottom crankcase, likewise the guide blade needs to seat properly at to and bottom.

Bryanj:
Incorrect locating dowels possibly, i know that has happened on 750's

mickwinf:
thanks will check all the above

mickwinf:
well i got another head gasket (genuine) so thought i would take head off to replace it. before i unscrewed the head nuts i thought i would recheck the tightness, and they were loose! I think something had stopped the head seating properly (as suggested by Bryan) but after running for a while it must have settled down to its correct place thus loosening the nuts slightly. So i took a chance and torqued it down, result! Sweet! Then had to replace a duff plug to get it running on 4, but very happy!

matthewmosse:
That's a good result.

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