CROSS REFERENCE PART NUMBERS:
• Yamaha 1C3-11631-00-A0
• Yamaha 1C3-11631-01-A0
• Yamaha 1C3-11631-02-A0
• Yamaha 1C3-11631-03-A0
• Pro-X 01.2225.A
ITEM SPECIFICATIONS:
• Component: Piston Kit (Size A, Standard Bore)
• Piston Size: 53.95mm (Size A)
• Bore x Stroke: 54.0mm x 54.5mm
• Displacement: 125cc
• Compression Ratio: 8.6:1
• Kit Contents: Piston, Ring, Wrist Pin, Circlips
• Material: Cast Aluminum Alloy Piston
• Engine: 125cc Liquid-Cooled 2-Stroke Reed-Valve Single-Cylinder
• Model Years: 2005-2022
COMPATIBLE MODELS:
Yamaha YZ125 / YZ125X Motocross:
• YZ125 (2005-2021)
• YZ125X Cross Country (2020-2022)
PRODUCT DETAILS:
Direct replacement piston kit engineered for the Yamaha YZ125 125cc liquid-cooled 2-stroke reed-valve motocross bike from 2005 through 2021 and the YZ125X cross country variant from 2020 through 2022. The Size A piston at 53.95mm provides factory-specified piston-to-wall clearance within the standard 54mm 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 YZ125. 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 YZ125 features Yamaha's proven liquid-cooled 2-stroke engine with YPVS power valve system and six-speed transmission providing competitive power for motocross racing. This piston kit ensures proper fit and dependable performance for all 2005-2021 Yamaha YZ125 and 2020-2022 YZ125X 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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