CROSS REFERENCE PART NUMBERS:
• Yamaha 18U-11631-00-A0
• Pro-X 01.2005.100
ITEM SPECIFICATIONS:
• Component: Piston Kit (1.0mm Oversize)
• Piston Size: 41mm (1.0mm Oversize)
• Bore x Stroke: 40.0mm x 39.2mm
• Displacement: 49cc
• Compression Ratio: 6.0:1
• Kit Contents: Piston, Ring, Wrist Pin, Circlips
• Material: Cast Aluminum Alloy Piston
• Engine: 49cc Air-Cooled 2-Stroke Reed-Valve Single-Cylinder
• Model Years: 1981-2025
COMPATIBLE MODELS:
Yamaha PW50 Youth Motorcycle:
• PW50 (1981-2025)
PRODUCT DETAILS:
Direct replacement piston kit engineered for the Yamaha PW50 49cc air-cooled 2-stroke reed-valve youth motorcycle from 1981 through 2025 model years. The 1.0mm oversize piston at 40mm provides factory-specified piston-to-wall clearance within the 41.0mm overbored cylinder for optimal ring seal and 2-stroke performance in the PW50 engine. 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 PW50. Precision machined on CNC equipment using low-expansion piston alloy for reliable sealing and consistent power delivery in youth motorcycle riding conditions. The PW50 features Yamaha's proven oil-injection 2-stroke engine with automatic transmission providing the ideal platform for young riders learning to ride. This piston kit ensures proper fit and dependable performance for all 1981-2025 Yamaha PW50 youth motorcycles.
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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