I've done a few Ryobis. One with CH and one with magneto. All Wacker engine parts for the muffler, mount and stuff. They run pretty good with a bigger carb. Nice engine for a Cub or a Decathlon. Too heavy to be an aerobatic performer though.

I've done 2 Poulans. Both 54cc. One was a twin ring and the other was a single ring. Actually, the single ring was a Craftsman, but same exact saw. They both had to be cut out of the saw. Kinda ugly and heavy. Both with synchrospark ignition. One was CH and one was RCIGN system. Both ran well, but heavy for the power they put out. Both engines weighed about 4.5 pounds with the muffler and ignition systems installed. They would swing a Pro Zinger 22-8 at about 6500-6700RPM with 40:1 mix and pump gas. Guys around here usually swing the same or similar prop on a BME or other commercially made engine at around the same RPM- so my power wasn't anything to laugh at-- they were just a bit heavy.

A stock G-62 weighs about 4.5 pounds with magneto---- BUT, it will swing a 22-10 or a 24-8 around 6700-7000RPM here.

I've got an old Pioneer saw thats reed valve induction. It's somewhere in the range of 64-67cc. I'd have to definetly use an elec. ignition system with it. I've talked to Ralph about converting it, but I'm concerned with getting parts if it ever needs repair. I think it would be kinda heavy, because the cylinder fins are HUGE and bulky. Looks like a lot of metal there for cooling. Looks heavy.

I need an engine that will turn a 22-10 or a 24-10 prop up in the 6500-7000 RPM range, but it's gotta be LIGHT.

Anyone have any conversion experience with engines in the 60-70cc range that are light enough to bolt on an 80" Extra 300S? Will it swing a 22 or 24" prop at decent RPMs?

Thanks