Originally posted by cbreeze
Greetings,
Picked up a used Supertigre 61 some time ago and have never run it. Took it apart for a anti-freeze bath and noticed that the top of the piston was pitted on the top edge on the exhaust side. Also, the ring was broken in the same spot. Can anyone tell me what could have caused this. Would detonation be a possible cause? Thanks for any advice.
I'd bet on detonation as almost a sure thing. After you get it fixed, add a head shim or run lower nitro fuel.