I have an echo conversion that I think is a 25cc (measured bore x stroke) with a cdi ignition and an 11mm walbro carb. I'm getting 8600rpm with an APC 14x6 and 8000 with a Topflight 14x8. I know the APC puts out about 8.5 lbs of thrust at 9400 on an O.S. 91 4stroke, and I'm looking for 10 - 11 lbs from this echo. My question is what are some of your rpm and thrust readings with various props? I'd like to know if I can get this kind of thrust from this engine before I go out and buy a handfull of $15 props to experiment with.

Thanks.