Piston Scratched - Exhaust side
#17
#19
It's the fuel, more specifically the oil, or lack of. I damaged my Kangaroo the same way using OD Speedblend. I have allowed adequate running in (1 gallon) but the piston seized several times during runs when I was trying to race tune the engine.
Speedblend contains 7.5% oil. Too little for on-road. I have since switched to Cosmo (12-14% oil).
Speedblend contains 7.5% oil. Too little for on-road. I have since switched to Cosmo (12-14% oil).