i know je makes better pistons for yamaha as i believe they are a bit thicker in certain stress areas. but i know jojje is running weisco pistons with a turbo, beats the ****** out of the thing all the time and has no problems at all. the 904 is proven to be bulletproof and even if the je was to be better is it really worth it?

Frank

(Former)05 BA tbike pipes, ai removed, Freak, mikuni hsr 42's, 904, ported/polished head, 1mm oversized valves NOW-2010 silver and black tbird