New Piston Kit Size B 53.95Mm Compatible With Yamaha Yz125

CROSS REFERENCE PART NUMBERS:
• Yamaha 5NY-11631-00-B0
• Yamaha 5NY-11631-01-B0
• Pro-X 01.2224.B

ITEM SPECIFICATIONS:
• Component: Piston Kit (Size B, Standard Bore)
• Piston Size: 53.95mm (Size B)
• Bore x Stroke: 54.0mm x 54.5mm
• Displacement: 125cc
• Compression Ratio: 8.7:1
• Kit Contents: Piston, Ring, Wrist Pin, Circlips
• Material: Cast Aluminum Alloy Piston
• Engine: 125cc Liquid-Cooled 2-Stroke Reed-Valve Single-Cylinder
• Model Years: 2002-2004

COMPATIBLE MODELS:
Yamaha YZ125 Motocross:
• YZ125 (2002-2004)

PRODUCT DETAILS:
Direct replacement piston kit engineered for the Yamaha YZ125 125cc liquid-cooled 2-stroke reed-valve motocross bike from 2002 through 2004 model years. The Size B 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 2002-2004 Yamaha YZ125 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