Silver,don't stop now.I have a BGX-1 0n a Giant Knife.I went through all kinds of problems also.First,it takes forever to break in.After a few gallons,the motor will increase in power every time you fly it.Also you may think you have solved the problem but hanging on the prop close to the ground it will quit occasionally(I know) if you don't get a cline regulator(not the pump!)The problem is fuel draw.This is a great motor once broken in and the fuel draw solved.I almost hate to mention spending more money,but I ran across a header and pipe(about 10") at a steal at Joe Nall and it really added power overall.It is big and OK on something like a Knife but would be hard to install on a bipe or normal plane.Good luck. Dave