PISTON KIT 01-04 YFM660 100 A, WOSSNER 8507DA YAMAHA ATV 3YF-11631-00-X0

This Wossner Piston Kit features a 100mm bore and is designed as a standard replacement for various Yamaha motorcycle and ATV models, including the XTZ660 Tenere and Raptor, as well as the YFM660R Raptor and YFM660F Grizzly. Forged in Germany, the piston is engineered to optimise heat transfer and minimise stress under thermal expansion, thanks to its elliptical design and high-quality construction.

Features

• Forged construction offers superior strength and reliability

• Engineered for optimal combustion chamber heat transfer

• Elliptical design distributes thrust loads evenly and prevents piston collapse

• Manufactured in Germany

Specifications

• Bore: 100.00 mm

• Measured Bore: 99.93 mm

• Clearance: 0.07 mm

• Compression Ratio: OEM

• OEM Compression Ratio: 9.20:1

• Dome Volume: -0.30 cm³

• Compression Height: 27.00 mm

• Display: 660 cm³

• Hub Stroke: 84.00 mm

• Part No.: 56-W8507+00A.WO

• Piston Kit Model: 8507DA (STD)

Cross-Reference OEM Part Numbers

• 3YF-11631-00-X0

• 4966M10000

• 01.2660.000

Vehicle Fitments

• Yamaha XTZ660 Tenere 1991–1998

• Yamaha XTZ660 Raptor 1991–1998

• Yamaha YFM660R Raptor 2001–2009

• Yamaha YFM660F Grizzly 2001–2009