Piston Kit Yfm YFB250 72.50, Wossner Forged 8659D150

Description

The Wossner 72.50mm Bore Piston Kit (Part No. 8659D150) 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: 72.50mm
  • Actual Bore Diameter: 72.44mm
  • 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: 725XDS

Vehicle Fitments

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

Piston Kit Yfm YFB250 72.50, Wossner Forged 8659D150

Product form

The Wossner 72.50mm Bore Piston Kit (Part No. 8659D150) is a high-performance forged piston designed for Yamaha YFM250 Timberwolf, YFB250... Read more

2 in stock 1-2 business days

£201.63 Incl. VAT

    • Guaranteed secure & safe checkout.

      shop pay

    SKU: 56-W4675+150.WO

    • Free shipping on all orders above £75
    • No hassle returns within 30 days

    Description

    The Wossner 72.50mm Bore Piston Kit (Part No. 8659D150) 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: 72.50mm
    • Actual Bore Diameter: 72.44mm
    • 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: 725XDS

    Vehicle Fitments

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

    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.

    WHY NOT CHECK OUT

    Recently viewed products

      Sign up for our newsletter

      Subscribe to our Mailing List

      Never miss any news and be the first to know about sale and offers

      © 2026 Radhouse, Powered by Shopify

        • American Express
        • Apple Pay
        • Diners Club
        • Discover
        • Google Pay
        • Maestro
        • Mastercard
        • PayPal
        • Shop Pay
        • Union Pay
        • Visa