I have a almost new RB s-5 motor (3/4 of a gallon) with a long header and OS 2040 pipe and I'm having glow plug issues. I am having problems keeping the glow plugs working. The plugs are not distorded or broken but after a tank or 2 they stop working. This happen to the RB plug that came with the motor and a #6 McCoys. I also used a MC59 and that last a while longer but still died. The motor is smoking on the top at Full throttle. The motor is a little rich on the bottom still but not sure if thats causing the problem or not. Please help.

Mike