Jeff I have cut the prop down and this has worked well. The lipoly 's are a test pack for me. I tried using the jetti, but can't figure out what's going on with the speed control. I retart the throttle and wait then push up the throttle and the motor will begin to run but only briefly. Then it will stop as the throttle is advanced further forward. I have reversed the throttle and it won't work at all. Anythoughts. Thanks vettdvr