need help ? o6 mcx 280 hp apex popping banging under boost?

[925rotax]

I just found out he DID change the plugs out. He never gapped them. Would you know what they should be gapped too?

 

[NB-Snowgoer]

0.018"

 

[mbarryracing]

X2

Could be electrically misfiring, likely blowing the spark out due to added turbulance in the CC..
What spark plugs and what gap are you running?
Stock plugs set at 0.018" gap will solve that problem...