New Piston Kit Size B 76.96Mm Compatible With Yamaha Yz250f

CROSS REFERENCE PART NUMBERS:
• Yamaha 1SM-11631-00-00
• Yamaha 1SM-11631-01-00
• Pro-X 01.2414.B

ITEM SPECIFICATIONS:
• Component: Piston Kit (Size B, Standard Bore)
• Piston Size: 76.96mm (Size B)
• Bore x Stroke: 77.0mm x 53.6mm
• Displacement: 249cc
• Compression Ratio: 13.5:1
• Kit Contents: Piston, Rings, Wrist Pin, Circlips
• Material: Forged Aluminum Alloy Piston
• Engine: 249cc Liquid-Cooled 4-Stroke DOHC 4-Valve Single-Cylinder
• Model Years: 2014-2015 (YZ250F), 2015-2017 (WR250F), 2015-2016 (YZ250FX)

COMPATIBLE MODELS:
Yamaha YZ250F / WR250F / YZ250FX:
• YZ250F (2014-2015)
• WR250F (2015-2017)
• YZ250FX (2015-2016)

PRODUCT DETAILS:
Direct replacement piston kit engineered for the Yamaha YZ250F 2014-2015, WR250F 2015-2017, and YZ250FX 2015-2016 with the 249cc liquid-cooled 4-stroke DOHC 4-valve engine. The Size B piston at 76.96mm provides factory-specified piston-to-wall clearance within the standard 77mm cylinder bore for optimal ring seal and 4-stroke performance across the full RPM range. Kit comes complete with forged aluminum alloy piston, precision-fitted piston rings, hardened wrist pin, and retaining circlips for a top-end rebuild on the Yamaha YZ250F WR250F and YZ250FX. Precision machined on CNC equipment using premium forged aluminum alloy for reliable sealing and consistent power delivery in motocross and off-road racing conditions. The YZ250F features Yamaha's proven liquid-cooled DOHC engine with titanium valves, fuel injection, and five-speed transmission providing competitive power for motocross racing. This piston kit ensures proper fit and dependable performance for all YZ250F WR250F and YZ250FX motocross and enduro 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