Pop cans... nice... I can feel the slices in my fingers already! LoL Might be worth a shot. I might even be able to come up with shims at my work, who knows....

So the shim just needs to be the same size as the top of the cylinder wall and slap the top on? What would be my tolerance for 'overhang' if I wasn't able to trim it as close as I wanted to? Thinking an exacto knife might actually cut pretty well against a piece of pine in this case. I'm running 15% in my other motor (K&B .61), but I think I'll switch to 10% and call it a happy medium, I know the motor is reccomended for less than I am running. Still awaiting to find out if the last LHS has FAI fuel. I also discovered I have a source of methanol in large quantities at a substantial discount As for an oil I could use Klotz if I find it locally, or I have MobilJet 254, which I hear will mix and runs at about 15%.