This is one of the best sport engines made- It has a built in fuel delivery system that is sweet

It is usually used for speed planes (Patriot, Magnum, F-20 etc..) but I have heard good things about fun-flys with these motors-

Run 20/20 fuel (Synthetic), OS-8, and any prop from a 9 x 9 up* The sweet spot on my Lanier F-4 is a 10 x 7 (This is for speed tho.) Dunno RPM's check:


http://www.ysperformance.com/
You have the stock muffler or the pipe?

This is by far the best engine I have ever owned- (No I have not has a Jett YET )

james