WISECO 70mm FORGED PISTON KIT YAMAHA YZ250 1988-1991

Part No. 56-W605+200_WI
Wiseco Pro-Lite Piston Assembly ?Durability, longevity and increased horsepower ?Innovative forging design and piston skirt provide maximum horsepower and torque ?Lightweight wrist pins enable faster revs and quicker throttle response ?Power Valve must be modified for .040 and larger

?1991 model is Ceramic Composite-Cylinder sleeving or replating required for oversizes ?Top-End bearing available-part no. B1014
Included Items: One 70.0mm piston Two 2756CD rings Two CW18 circlips One S508 wrist pin