Yesterday a friend of mine at the field started his 58gx in a lanier 330, and it flew just about to finish its braekin just flying it normally aroud the field an occional loop but basic straight flite al of a sudden i heard a funny noise from the engine and told him to land it quick on approche engine koncked out. on inspeccion we found out that the ring had broken and also the piston he told me he was useing a 30:1 mix with the oil that came with the engine. any insight on this