PISTON KIT YFZ450/R/X 95.00 A, WOSSNER 8601DA FORGED KIT 5TG-11631-12-00

The Wossner 8601DA forged piston kit features a 95.00mm bore and is designed for Yamaha YFZ450 models from 2004 to 2005. Manufactured in Germany, this piston is built for optimal strength, heat transfer, and durability under high-performance conditions. Its elliptical shape ensures even pressure distribution and minimizes the risk of piston collapse due to thermal expansion.

Features

• Forged piston construction for enhanced strength and durability
• Designed for efficient heat transfer from the combustion chamber to cylinder walls
• Elliptical profile provides uniform bearing surface under heat expansion
• Reduces localized pressure and prevents piston collapse
• Manufactured in Germany

Specifications

• Bore: 95.00 mm
• Actual Bore Diameter: 94.95 mm
• Display: 449 cm³
• Hub Stroke: 62.00 mm
• Clearance: 0.05 mm
• Compression Height: 25.00 mm
• Dome Volume: -7.40 cm³
• Compression Ratio: OEM (11.90:1)
• Theoretical Weight: Not specified

Cross-Reference OEM Part Numbers

• Piston: 8601DA
• Lock: CW20
• Pin: WP038
• Ring Set: 950XSY
• Rod: P4029
• Part No.: 56-W4865+00A.WO
• OEM Reference: 5TG-11631-12-00, 4865M09500

Vehicle Fitments

• Yamaha YFZ450 2004–2005

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