PISTON KIT YFM400FW 00-06, FORGED WOSSNER 8901DA 5GH-11631-00-00

This Wossner piston kit features a standard 92.00mm bore with a measured diameter of 84.42mm, engineered for Yamaha YFM400FW Kodiak (2000–2006) and YFM4 Grizzly 400 (2007–2008) models. Built for durability and thermal efficiency, this forged piston is optimised for four-stroke engine performance in utility ATV applications.

Features

• Forged piston construction for superior strength and reliability

• Advanced heat transfer design from combustion chamber to cylinder walls

• Elliptical profile promotes uniform bearing surface under thermal expansion

• Even thrust load distribution reduces localised stress and prevents piston collapse

• Manufactured in Germany

Specifications

• Bore: 92.00mm

• Diameter: 84.42mm

• Display: 400 cm³

• Stroke: 70.50 mm

• Clearance: 0.08 mm

• Compression Ratio (Wossner): 8.50:1

• Compression Ratio (OEM): 10.50:1

• Dome Volume: -2.90 cm³

• Compression Height: 26.90 mm

• Clips P/N: CW20

• Pin P/N: WP052

• Ring Set P/N: 845XSY

Cross-Reference OEM Part Numbers

• Part No. 56-W9924.00A.WO

• Wossner Piston 8901DA

• 5GH-11631-00-00

• 40076M08450

Vehicle Fitments

• Yamaha YFM400FW Kodiak 2000–2006

• Yamaha YFM4 Grizzly 400 2007–2008

Dispatch Times

Local Stock: Dispatches in < 24 hours

Parts showing as available at our Warehouse in Gorey ship the same business day if ordered before 1pm. 

Supplier Stock: Dispatches in 2-4 Days

Parts showing as available at our Supplier Warehouse are ordered from our supplier and delivered to us before we can dispatch. More info is available on this page under "Stock Availability".

OEM Special Order: Dispatches in 3-10 Days

This website does not have access to live stock levels from our OEM Suppliers. In most cases the parts will be available but in the case of backordered parts we will notify you. We receive parts from Yamaha in 3-4 days, All others including Honda, Suzuki, Kawasaki, Polaris please allow 7-10 days for us to receive the parts. 

Delivery Times

Ireland & Northern Ireland:

1-2 Days using GLS/An Post

Germany, France, Netherlands, Belgium:

3-5 Days using GLS/Fedex

Italy, Spain & Other EU Countries:

4-7 Days using GLS/Fedex