Hello -

I've got an Evolution 26GT that I cannot get to run properly. I'm using high quality 2 stroke 100% synthetic racing oil and premium gasoline. The ignition system is being powered by a 7.2 volt 1500 milliamp battery. The engine runs and does not die. I have adjusted both the high and low settings and have them where the engine sounds like it should. ( to me anyway). The problem is persistent throughout the entire RPM range. It sputters, sounds like it is missing. In the air with the plane pointed down the engine stops sputtering and runs just fine. On the ground I try to replicate this by holding the plane at a 45 degree angle UP and then move it to a 45 degree angle down; the engine continues to sputter. I cannot replicate in flight on the ground.

Any ideas as to what I should try?

Thanks for any and all suggestions!!!


Brian