50cc piston diameter 40.3mm, piston pin 12mm 70cc piston diameter 47mm, piston pin 12mm 90cc piston diameter 49mm, piston pin 12mm TZR 50 X-Power 2003-2004 (AM6) X-Limit SM 50 LC 2T 2002 (AM6) X-Limit SM 50 LC 2T 2003-2006 (AM6) ...