Hello all! 

     I am having a very frustrating problem with a 1980 somthing rotax 247 single mounted as a lift fan for a hovercraft. I bought the craft with this problem and thought I could figure it out. I can get the motor to idle, but not accelerate unless the throttle is moved very slowly. I have rebuilt the original tillotson carb, tried 2 others with the same issue. I have rebuilt the engine completely with new gaskets piston etc. I have set the timing to spec.I get reversion through the carb when I try to accelerate and when at speeds above idle.

Please help! I am going crazy trying to figure this out.

Thank you



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