Hello, I just installed a Polini kit on a ZA50. I just started it up for the first time, and I noticed a "ping" sound. It is a metally sound, like if you hit a screwdriver on the cylinder head. It follows the revs of the engine. Yes I didn't forget the head gasket. Whats the deal?
15mm Bing with 102 jet (too big probably)
Stock Head, stock timing.