Fresh bored .20 over, constantly fouling plugs. Before rebuild, never fouled a plug in years, running 32:1 with klotz oil,has stock needle and needle jet, down 3 notches in the needle, 250 main jet, don't understand why it fouls plugs, help please!!

Does it run good without any miss-firing at partial throttle?

Does it run good at wide open throttle and high RPM?


What spark plug are you running