G'day,
yeh ide agree accept ive alredy checked the flywheel key and made sure the magnetron is at the right distance from the flywheel. i believe the problem is that the pressed steel stack pulley is way to light to act in place of the blades as a flywheel apparatus. the original engine was one of the good old 5hp briggs i/c with the big very heavy cast iron flywheel. the thing about the kickback is when it gets to the compression stroke it kicks because there isn't enough momentum stored in the light flywheel to spin it easily threw the compression stroke.
regards jay
