Chuck, just by chance, I was out in the back yard this afternoon tacking my velocity stack equiped G-62 on a plain old Zinger 22x10. By leaning the high speed needle way out (3/4 turn open) I could get 6900 rpm. I backed the needle out 1/4 turn and had 6600 rpm. That's where I left it. I'm running Klotz KL-300 synthetic (50:1) and 87 octane regular gas. The engine is well broken in. I can pick up about 800 rpm with a Menz 22x10 Ultra but I'm not sure I really like the extra rpm. Vibration goes up with more rpm even with a carefully balanced prop.

Ken