Guys...do you remember the old style glow engine that had a plate that would cover the exhaust port as you closed the throttle. What I did was to experiment as I throttled down my 25cc gas/glow engine I covered the exhaust port with my finger (with heavy leather glove) and I could idle the engine right down to a very low RPM. Same as with a gas engine like a chain-saw engine. Try it!! I am thinking a exhaust throttle should be made and tried. Problem is...I cannot come up with a good design. I am sure it would really help transition and idle. Any comments? Capt,n