B
I pulled my motor apart last night to put a top end, new SLP head and pipe on it and was shocked at what I found. I have a stock motor 08 800 XP with aprox 1800 miles. The mag side piston has tons of detonation scarrs in the piston and head, towards the exahuast side of the piston it is so bad that the piston is actual disintegrated almost to the ring. The primary side piston has three detonation warks in the piston and head. I ran premium fuel all winter and have stock jetting, any ideas?