CROSS REFERENCE PART NUMBERS:
• Yamaha 5JG-11631-00-00
• Yamaha 5JG-11631-10-00
• Yamaha 5NG-11631-00-00
• Yamaha 5NG-11631-10-00
• Pro-X 01.2427.B
ITEM SPECIFICATIONS:
• Component: Piston Kit (Size B, Standard Bore)
• Piston Size: 94.96mm (Size B)
• Bore x Stroke: 95.0mm x 60.1mm
• Displacement: 426cc
• Compression Ratio: 12.5:1
• Kit Contents: Piston, Rings, Wrist Pin, Circlips
• Material: Forged Aluminum Alloy Piston
• Engine: 426cc Liquid-Cooled 4-Stroke DOHC 5-Valve Single-Cylinder
• Model Years: 2000-2002 (YZ426F), 2001-2002 (WR426F)
COMPATIBLE MODELS:
Yamaha YZ426F / WR426F:
• YZ426F (2000-2002)
• WR426F (2001-2002)
PRODUCT DETAILS:
Direct replacement piston kit engineered for the Yamaha YZ426F 426cc liquid-cooled 4-stroke DOHC 5-valve motocross bike 2000-2002 and WR426F enduro 2001-2002 sharing the same 95mm cylinder bore. The Size B piston at 94.96mm provides factory-specified piston-to-wall clearance within the standard 95mm cylinder bore for optimal ring seal and 4-stroke performance across the full RPM range. Kit comes complete with forged aluminum alloy piston, precision-fitted piston rings, hardened wrist pin, and retaining circlips for a comprehensive top-end rebuild on the Yamaha YZ426F and WR426F. Precision machined on CNC equipment using premium forged aluminum alloy for reliable sealing and consistent power delivery in motocross and off-road racing conditions. The YZ426F and WR426F feature Yamaha's proven liquid-cooled DOHC engine with titanium valves and five-speed transmission providing competitive power for motocross and enduro racing. This piston kit ensures proper fit and dependable performance for all 2000-2002 YZ426F and 2001-2002 WR426F 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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