PISTON KIT 99-25 YZ250 66.40, WISECO 804M06640B PRO-LITEPart No. 56 W742. B. WI (phoenixmotos. com) Fantic XX 250 2022 2023 Yamaha YZ 250 1999 2025 YZ 250 X 2016 2025 Overview of Wiseco Pro Lite Piston Assembly 804M06640 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 Ceramic Composite Cylinder sleeving or replating required for oversizes Top End bearing

- High grade Stainless braiding to help eliminate expansion and transmit Sustained braking force to your calliper

The ProX titanium valves do exceed OE specifications in dimensions and reliability

low-friction piston alloy is used as is used for all major Japanese engine manufacturers

any questions please feel free to ask

Assemblies where 93102-28004-00 is used

Here are the details: Features:

HD springs and steel separator plates Load on the clutch basket is spread and clutch basket dogging is prevented using swaged aluminum carriers

Double forged on dedicated forgings This process maintains superior strength

oil muddying and loss of stack height Complete engine set of friction plates

94 Wossner 8134DA (STD)

YZ 125 1994 - 1997

longevity and increased horsepower Innovative forging design and piston skirt provide maximum horsepower and torque