First, it sounds like you need to change your throttle geometry or tx curve so that 1/2 travel on the stick gives you less rpm's. If it is deadsticking after half throttle it might be too lean on the HSN, have a filter, or fuel delivery problem.
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on my gas engine when i have the throttle stick on the transmitter 1/2 open the engine is running full throttle >> if i push the stick further the engine dies out>>>>any one might know why> thank you