CROSS REFERENCE PART NUMBERS:
• Yamaha 4ES-11631-00-A0
• Yamaha 4ES-11631-01-A0
• Pro-X 01.2107.A
ITEM SPECIFICATIONS:
• Component: Piston Kit (Size A, Standard Bore)
• Piston Size: 45.93mm (Size A)
• Bore x Stroke: 46.0mm x 47.8mm
• Displacement: 79cc
• Compression Ratio: 8.2:1
• Kit Contents: Piston, Ring, Wrist Pin, Circlips
• Material: Cast Aluminum Alloy Piston
• Engine: 79cc Liquid-Cooled 2-Stroke Reed-Valve Single-Cylinder
• Model Years: 1993-2001
COMPATIBLE MODELS:
Yamaha YZ80 Motocross:
• YZ80 (1993-2001) - International 46mm Bore
PRODUCT DETAILS:
Direct replacement piston kit engineered for the Yamaha YZ80 79cc liquid-cooled 2-stroke reed-valve motocross bike from 1993 through 2001 model years with the international 46mm bore cylinder. The Size A piston at 45.93mm provides factory-specified piston-to-wall clearance within the standard 46mm 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 YZ80. 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 YZ80 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 1993-2001 Yamaha YZ80 international bore 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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