CROSS REFERENCE PART NUMBERS:
• Yamaha 3XK-11631-00-C0
• Yamaha 4DA-11631-00-C0
• Yamaha 4EW-11631-00-C0
• Yamaha 4EW-11631-01-C0
• Yamaha 4SR-11631-00-C0
• Pro-X 01.2314.C
ITEM SPECIFICATIONS:
• Component: Piston Kit (Size C, Standard Bore)
• Piston Size: 67.96mm (Size C)
• Bore x Stroke: 68.0mm x 68.0mm
• Displacement: 249cc
• Compression Ratio: 8.7:1
• Kit Contents: Piston, Ring, Wrist Pin, Circlips
• Material: Cast Aluminum Alloy Piston
• Engine: 249cc Liquid-Cooled 2-Stroke Reed-Valve Single-Cylinder
• Model Years: 1988-1998 (YZ250), 1991-1997 (WR250)
COMPATIBLE MODELS:
Yamaha YZ250 / WR250 Motocross:
• YZ250 (1988-1998)
• WR250 (1991-1997)
PRODUCT DETAILS:
This piston kit is a direct replacement for the Yamaha YZ250 1988-1998 and WR250 1991-1997 with the 249cc liquid-cooled 2-stroke reed-valve single-cylinder engine. The 67.96mm Size C piston is designed for the standard 68mm cylinder bore providing factory-specified piston-to-wall clearance for optimal ring seal and compression in the high-revving YZ250 and WR250 2-stroke engine. Each kit includes cast aluminum alloy piston, precision-fitted piston ring, hardened wrist pin, and retaining circlips for all Yamaha YZ250 and WR250 2-stroke applications. Manufactured using low-expansion piston alloy and precision machined on CNC equipment for consistent dimensions and reliable performance in motocross and off-road racing conditions. The YZ250 features a liquid-cooled 2-stroke engine with YPVS power valve and five-speed transmission for competitive motocross racing. Installs directly into the standard 68mm cylinder bore without modifications for piston replacement or top-end rebuild on all 1988-1998 YZ250 and 1991-1997 WR250 motocross and enduro 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
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