New Piston Kit Size D 66.38Mm Compatible With Yamaha Yz250 Yz250x 1999-2025 Suzuki Rm250 2003-2012

CROSS REFERENCE PART NUMBERS:
• Yamaha 1P8-11631-00-D0
• Suzuki 12110-37F30-0F0
• Pro-X 01.2321.D

ITEM SPECIFICATIONS:
• Component: Piston Kit (Size D, Standard Bore)
• Piston Size: 66.38mm (Size D)
• Bore x Stroke: 66.4mm x 72.0mm
• Displacement: 249cc
• Kit Contents: Piston, Ring, Wrist Pin, Circlips
• Material: Cast Aluminum Alloy Piston
• Engine: 249cc Liquid-Cooled 2-Stroke Reed-Valve Single-Cylinder
• Model Years: 1999-2025 (YZ250), 2016-2025 (YZ250X), 2003-2012 (RM250)

COMPATIBLE MODELS:
Yamaha YZ250 / YZ250X / Suzuki RM250:
• Yamaha YZ250 (1999-2025)
• Yamaha YZ250X (2016-2025)
• Suzuki RM250 (2003-2012)

PRODUCT DETAILS:
Direct replacement piston kit engineered for the Yamaha YZ250 249cc liquid-cooled 2-stroke reed-valve motocross bike 1999-2025 and the Suzuki RM250 2003-2012 sharing the same 66.4mm cylinder bore. The Size D piston at 66.38mm provides factory-specified piston-to-wall clearance within the standard 66.4mm cylinder bore for optimal ring seal and 2-stroke performance across the full RPM range. Kit comes complete with cast aluminum alloy piston, precision-fitted piston ring, hardened wrist pin, and retaining circlips for a comprehensive top-end rebuild on the Yamaha YZ250 and Suzuki RM250. Precision machined on CNC equipment using low-expansion piston alloy for reliable sealing and consistent power delivery in motocross and off-road racing conditions. Both the Yamaha YZ250 and Suzuki RM250 feature proven liquid-cooled 2-stroke engines with power valve systems and five-speed transmissions for competitive motocross racing. This piston kit ensures proper fit and dependable performance for all 1999-2025 YZ250, 2016-2025 YZ250X, and 2003-2012 RM250 motocross bikes.

PRODUCT NOTICE:
As a parts distributor we mostly sell aftermarket parts (any OEM parts would be noted as such). Aftermarket parts are not sourced from the original vehicle or equipment manufacturer, but are designed to function the same as - if not better than - the original. All parts sold are new.

WARNING - This product may expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov