Name: Piston Kit Yfm YFB250 71.00, Wossner Forged 8659DA 92-01
Brand: Wossner
SKU: 56-W4675+000.WO

Piston Kit Yfm YFB250 71.00, Wossner Forged 8659DA 92-01

Wossner
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Description

The Wossner 71mm Bore Piston Kit (Part No. 8659DA) is a high-performance forged piston designed for Yamaha YFM250 Timberwolf, YFB250 Bear Tracker, Bruin, and Big Bear models. Engineered for strength and durability, it optimizes heat transfer within the combustion chamber and features an elliptical design to ensure even load distribution, reducing localized pressure and preventing piston collapse. Manufactured in Germany, this piston maintains the OEM compression ratio for reliable engine performance.

Features

High-strength forged piston construction
Optimized heat transfer for improved combustion efficiency
Elliptical design for even thrust load distribution
Manufactured in Germany

Specifications

Bore Size: 71mm
Actual Bore Diameter: 70.94mm
Compression Ratio: OEM
OEM Compression Ratio: 9.50:1
Displacement: 229cc
Stroke: 58.00mm
Clearance: 0.06mm
Dome Volume: -4.70cm³
Compression Height: 23.80mm

Cross-Reference OEM Part Numbers

Lock P/N: CW16
Pin P/N: WP041
Ring Set P/N: 710XDS

Vehicle Fitments

Yamaha YFM250 Timberwolf (1990-2000)
Yamaha YFB250 Bear Tracker (2000-2004)
Yamaha Bruin (2005-2006)
Yamaha Big Bear (2007-2009)

Vehicle Compatibility

Please check the exact model and year before ordering.

Manufacturer	Model	Years
YAMAHA	YFM BRUIN 250	2005-2006
YAMAHA	YFM BIG BEAR 250	2007-2009
YAMAHA	YFM BEAR TRACKER 250	1999-2004
YAMAHA	YFB TIMBERWOLF 250	1992-1999
YAMAHA	YFB TIMBERWOLF 250	1994-2000
YAMAHA	YFM TIMBERWOLF 250	1990-2000
YAMAHA	YFB BEARTRACKER 250	2000-2004

Piston Kit Yfm YFB250 71.00, Wossner Forged 8659DA 92-01

Wossner
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The Wossner 71mm Bore Piston Kit (Part No. 8659DA) is a high-performance forged piston designed for Yamaha YFM250 Timberwolf, YFB250... Read more

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SKU: 56-W4675+000.WO

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Description

The Wossner 71mm Bore Piston Kit (Part No. 8659DA) is a high-performance forged piston designed for Yamaha YFM250 Timberwolf, YFB250 Bear Tracker, Bruin, and Big Bear models. Engineered for strength and durability, it optimizes heat transfer within the combustion chamber and features an elliptical design to ensure even load distribution, reducing localized pressure and preventing piston collapse. Manufactured in Germany, this piston maintains the OEM compression ratio for reliable engine performance.

Features

High-strength forged piston construction
Optimized heat transfer for improved combustion efficiency
Elliptical design for even thrust load distribution
Manufactured in Germany

Specifications

Bore Size: 71mm
Actual Bore Diameter: 70.94mm
Compression Ratio: OEM
OEM Compression Ratio: 9.50:1
Displacement: 229cc
Stroke: 58.00mm
Clearance: 0.06mm
Dome Volume: -4.70cm³
Compression Height: 23.80mm

Cross-Reference OEM Part Numbers

Lock P/N: CW16
Pin P/N: WP041
Ring Set P/N: 710XDS

Vehicle Fitments

Yamaha YFM250 Timberwolf (1990-2000)
Yamaha YFB250 Bear Tracker (2000-2004)
Yamaha Bruin (2005-2006)
Yamaha Big Bear (2007-2009)

Vehicle Compatibility

Please check the exact model and year before ordering.

Manufacturer	Model	Years
YAMAHA	YFM BRUIN 250	2005-2006
YAMAHA	YFM BIG BEAR 250	2007-2009
YAMAHA	YFM BEAR TRACKER 250	1999-2004
YAMAHA	YFB TIMBERWOLF 250	1992-1999
YAMAHA	YFB TIMBERWOLF 250	1994-2000
YAMAHA	YFM TIMBERWOLF 250	1990-2000
YAMAHA	YFB BEARTRACKER 250	2000-2004

Shipping & Delivery

How long will my item take to arrive?

Orders are typically dispatched within 1 working day and are shipped on a 24hour (non-guaranteed) service.

Where do you ship to?

We currently only ship orders within the UK.

How can I track my order?

Once your order has been dispatched, you will receive a tracking code. Tracking information is emailed to the email address that was provided when placing the order.

Can I collect my order?

Unfortunately we do not offer order collections from our fulfilment centre.