Joe,
According to Ralph, the ONLY prop for this engine is the Mejzlick 18X6 (9000 RPM). I plan to buy one as soon as funds become available. $45.00 for a prop, OUCH (On a 1.20 size plane that's expensive, I wouldn't mind giving $45.00 for a prop for a 100cc engine though, only at that price it would be made of wood.....)

Brian,
My JBB won't be as fast as an USL. The wing is much thicker. I had a JBB with a 3W 24 on it, it had good power too but due to the design, is not very fast. I'm pretty sure my dad's us 40 with a TT.46 pro could out run it, but it won't even come close to out-performing it.

Birddog,
I read the instructions to the letter, and will follow them, My concern is, how do you adjust the needles with the engine running? With Ralph's carb rotator block the screws are on the bottom angled back toward the prop. It's going to be very tricky.

Thanks for all the replies guys, keep em coming. As soon as I get to fly this baby I'll let everybody know how it went.

GB