I ride MX and I ride decently hard and use the clutch alot and rev the bike out of the bike. And I've got my head cut to .045 squish and the dome cut out to stock compression, and i've retarded the timing. And its still pinging, it doesn't seem as bad now that i retarted the timing.But its still doing it. And way to get rid of it besides running race gas? I would run race gas but the only stuff I have locally is VP C-12 and that costs like $10 and that alittle too much for me, with how much I ride.