Paul,
My engine is the first type, thin mounting lugs on case. The engine mounts were version 2 and the ignition is version 2. Serial number 166

It sounds like your engine is running fine, if you want to impress yourself with static rpm get a 22x8 zinger pro. I bet you could spin one of them 7400+ but they are not even close to the prop a Xoar is. I have a zinger pro 22x8 I bought as a backup but I have not broken either of my good 22x8's so the Zinger has never even been drilled to fit.

And for everyone, lets not forget that no 2 props are the same. You can get 2 props, same mfg., same size... and be 300 rpm different static. Don't get caught up in static rpm, fly the prop that works for your combo and the way you fly.

But good props will give you the best chance at happiness.

Beila, Xoar, Skorepa, Menz, Mejzlic, NX, JXF, 3W, Evolution, BME these are the ones I can think of. You could get a prop that doesn't work for your application, but you wont get very many "bad props" if you stick with these. Remind me if I missed some.

Scott