pinging

Hello guys,, Just built our HM60 for Nova Tote Gote and its the 1970s Block with the adjustable breaker plate,Pinging Noise, So we might have the plate to much advance on spark timing? Is this possible? We are going to Buy 90 Octane fuel today and give this Goat a ride.see if that 90 Octane fuel...

I have a pretty new Hilliard clutch on my 212cc Predator. The clutch makes a slight pinging sound like the bell housing might be getting tapped by one of the shoes. Like I said the clutch is new but when I took it apart it had some slight blue tint to the middle area. I think I read before tha...