PISTON KIT 99-25 YZ250 66.40 C, PROX 01.2321.D RM250 03-12Piston KIT 66. 40mm Bore [Piston Size: 66. 38mm] ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low expansion, low friction piston alloy is used as is used for all major Japanese engine manufacturers. ProX Piston Kits are a first class solution to replace the original piston in your Motorcycle, Scooter, Moped, ATV, Personal Watercraft, etc. Coated for ultimate performance Most of the ProX pistons come with

OEM Compression ratio: 2 stroke

HOT RODS 8717 YAMAHA YZF250 Yamaha WR 250 F 2015-2018

eliminating localized pressure and distributing thrust loads more evenly

Direct OEM replacement for precise fitment

and the output shaft collar and lock washer

2004 Yamaha YZ250F

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Yamaha YZ250 2002-2019

1999 Yamaha YZ250

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 available-part no

Yamaha WR250 FF/FG (4T/Reverse Cylinder) (2015-2016)