WISECO TOP END KIT PRO-LITE 54.00/STD YAM - PK1344The Wiseco Pro Lite Top End Piston Kit PK1344 is a complete 54. 00mm standard bore engine rebuild kit for Yamaha applications, giving you every part you need in one box for the Wiseco Pro Lite 54mm top end piston kit Yamaha. This kit is built for riders who want to do a full top end rebuild without hunting down parts from three different suppliers. The forged aerospace alloy piston delivers crisp throttle response and a power feel that lasts well past