CROSS REFERENCE PART NUMBERS:
• Yamaha 5PA-11631-00-A0
• Yamaha 5PA-11631-10-A0
• Pro-X 01.2114.A
ITEM SPECIFICATIONS:
• Component: Piston Kit (Size A, Standard Bore)
• Piston Size: 47.44mm (Size A)
• Bore x Stroke: 47.5mm x 47.8mm
• Displacement: 85cc
• Compression Ratio: 8.2:1
• Kit Contents: Piston, Ring, Wrist Pin, Circlips
• Material: Cast Aluminum Alloy Piston
• Engine: 85cc Liquid-Cooled 2-Stroke Reed-Valve Single-Cylinder
• Model Years: 2002-2025
COMPATIBLE MODELS:
Yamaha YZ85 / YZ85-LW Motocross:
• YZ85 (2002-2025)
• YZ85-LW Large Wheel (2022-2025)
PRODUCT DETAILS:
Direct replacement piston kit engineered for the Yamaha YZ85 85cc liquid-cooled 2-stroke reed-valve motocross bike from 2002 through 2025 model years including the YZ85-LW large wheel variant from 2022 onward. The Size A piston at 47.44mm provides factory-specified piston-to-wall clearance within the standard 47.5mm 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 YZ85. Precision machined on CNC equipment using low-expansion piston alloy for reliable sealing and consistent power delivery in motocross and off-road racing conditions. The YZ85 features Yamaha's proven liquid-cooled 2-stroke reed-valve engine with six-speed transmission providing competitive power for youth motocross racing. This piston kit ensures proper fit and dependable performance for all 2002-2025 Yamaha YZ85 and YZ85-LW 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
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