Thanks Dave I will keep that in mind. I will know better once I get to tach. the rpms. I am not looking for high rpm's for the model the engine is being used in. Thrust is more important for the bigger prop. Still have to play around with it. I think this Walbro WT 644 carb. is making a big difference. I'll post again once I have had a chance to get the RPM's and have a little more run time on the engine.

John