Originally Posted by BPro

Hey guys, I have a Novarossi Plus4c that i got used supposedly with only 2 litres on the bench.

I'm breaking it in with a heat gun, competition heat, 30% VP Powermaster fuel and a OS P3 plug.

It idles fine but i can hear something like the Piston Knocking , never heard this strange noise before any ideas of what it might be?

Thanks.