CROSS REFERENCE PART NUMBERS:
• Yamaha 5BE-11631-01-A0
• Yamaha 5BE-11631-02-A0
• Yamaha 5GR-11631-00-00
• Pro-X 01.2419.A
ITEM SPECIFICATIONS:
• Component: Piston Kit (Size A, Standard Bore)
• Piston Size: 91.95mm (Size A)
• Bore x Stroke: 92.0mm x 60.1mm
• Displacement: 399cc
• Compression Ratio: 12.5:1
• Kit Contents: Piston, Rings, Wrist Pin, Circlips
• Material: Forged Aluminum Alloy Piston
• Engine: 399cc Liquid-Cooled 4-Stroke DOHC 5-Valve Single-Cylinder
• Model Years: 1998-1999 (YZ400F), 1998-2000 (WR400F)
COMPATIBLE MODELS:
Yamaha YZ400F / WR400F:
• YZ400F (1998-1999)
• WR400F (1998-2000)
PRODUCT DETAILS:
Direct replacement piston kit engineered for the Yamaha YZ400F 399cc liquid-cooled 4-stroke DOHC 5-valve motocross bike 1998-1999 and WR400F enduro 1998-2000 sharing the same 92mm cylinder bore. The Size A piston at 91.95mm provides factory-specified piston-to-wall clearance within the standard 92mm 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 comprehensive top-end rebuild on the Yamaha YZ400F and WR400F. 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 YZ400F and WR400F feature Yamaha's proven liquid-cooled DOHC engine with titanium valves and five-speed transmission providing competitive power for motocross and enduro racing. This piston kit ensures proper fit and dependable performance for all 1998-1999 YZ400F and 1998-2000 WR400F 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
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