Well, the compression tester arrived this morning. I have done three consecutive tests and it read 95psi each time. I wasn't sure if it was a faulty gauge so I tried it on my trials bike and that was 125psi.
I took the exhaust off to see the piston, it still looks new and there is no carbon build up below the rings.
I have just taken the head off and the inner O ring looks pretty suspect at the exhaust port side, I can't see that it's been letting gas past but it definitely looks in worse shape in that area.
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