Ah, but are you the only one who puts petrol in?simon.holyfield wrote: ↑Sun May 14, 2023 8:00 pm ...By the way, I have always used Super E5 fuel in my bikes.....
I suspect that it might not be easy to nail down when the various refineries change the proportions, or exactly where they're supply what to.......and incidentally I believe that up here in Norfolk we don't have too much ethanol inflicted on us.
Personally, I'd fit a new piston. I know all the old hands are adept at 'easing down the high spots' but personally I've never had any success with that, the pistons have always either ended up with too much clearance and slapped like blazes or just carried on seizing up. I've also inherited a couple of pistons that have been 'eased down' by other folks and they've been no better.
Maybe add 'double check mixture' to the list?
SG