Did the mod on the reed. Bent the reed so that it fit the curve of the back plate and adjusted it so it just barely touched the seat. Bent the stop plate so it only contacted the reed at the very end where it clamps the reed. Did NOT cut waist in reed valve. Radius-ed the intake tube to a sort of bellmouth shape. (There's hardly any contact area around the edge of the hole so the radius was pretty small.

Not much gain. About 60 RPM. All this with an 8 mm venturi carb.

What's the consensus on the best carb size?? There has been a lot of talk about 11.1 mm venturi. Also heard of 12.2 mm (although I can't find that exact size in the literature. There's a 12.7mm)) and some thought that that might be too big. I'd like to hear from you all before I go out and buy another carb!

Thanks for the advice, diceco