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Hi Spookdog. The bikes a 1991 French import, cheers for the info about the screws. It looks all original, I've had it about 3yrs but recently started the top end. Took the cylinder to a local bike engineers who bore and fit a new piston, the original was 56mm its now been bored to 57mm but the piston seems sloppy in the barrel, can get a larger feeler down than speck....not good! Its bound to slap if over sized!? Whats your thoughts, its not back together yet.
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@DTTOLATE
It’ll slap and get worse quickly, well it has in my experience.
Piston should be tight in the bore. The only place I would get a rebore done now would be a reputable one. I use PJME because I heard nothing but good about them and the finish is excellent. I used a local engineer to get a barrel honed and it came back looking like it was raped by a Brillo pad!..If it’s as bad as you say I’d take it back to be fixed. You paid for a service you should be happy with.
Can you post pics of the finish in the barrel? If the it’s that bad I’m concerned about the hatching and the port skirting -
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