Right, I've stripped the barrel off and found piston is only running one compression ring. Is this standard practice or a dodgey legacy of the last owner (given what Yow Ling has said)?
Carb is essentially only very slightly canted forward with the rubber inlet manifold setup. Running 25:1 Avgas/2T mix. Only thing I've noticed with respect to fuel starvation is when the fuel tank runs low on gas the float bowl doesn't fill on right hand corners, but I think that is down to the fuel pick up point from the tank and the routing of the fuel line, nothing else.
Fuel tank outlet is on lower left side of tank, fuel pickup on carb is right hand side. Fuel line drops below level of fuel intake on carb (might be able to be changed). When fuel level gets low, fuel pressure drops, fuel wont flow left to right across the bike (centripedal force and all that) and then up to carb fuel pick up, so supply is interupted. Just need to keep minimum of 3 ltr in the tank to stop this, unless anyone knows of a suitable carb that has a left hand fuel pickup.
Hilleye
If it doesn't bring a tear to your eye, add a little more fully synth 2T to the mix.
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