PISTON KIT 08-13 YFM250R 74.00, WOSSNER 8724DA YAMAHA ATV, 1S4-11631-20-A0
Available from Supplier — dispatched directly
This item is dispatched directly to you by our supplier. Supplier stock is separate from stock held at BTP.
Looking to purchase?
Call or WhatsApp us on 01793 239039
or email Office@btpsouthwest.uk
Our team is on hand to help with availability, advice and finance options.
PISTON KIT 08-13 YFM250R 74.00, WOSSNER 8724DA YAMAHA ATV, 1S4-11631-20-A0 is available to order. Please contact us to confirm availability and lead time.
Pickup currently unavailable at Braydon Trailers HQ
BTP – Your Trusted Trailer & ATV Specialists in the South West
Authorised dealer for top brands, including CFMOTO, Brian James, Debon, Cheval Liberté, Tiki, Woodford, Erde, and more.
Description
Description
The Wossner 8724DA forged piston kit with a 74.00mm bore is designed for Yamaha YFM250R Raptor (2008–2013) and YBR250 (2008–2012). Manufactured in Germany, this high-compression piston enhances strength and heat transfer performance. Its elliptical shape ensures even pressure distribution during thermal expansion, reducing the risk of piston failure.
Features
- Forged high-compression piston for durability and performance
- Engineered for efficient heat transfer to cylinder walls
- Elliptical design ensures uniform pressure distribution during heat expansion
- Reduces localized stress and risk of piston collapse
- Manufactured in Germany
Specifications
- Bore: 74.00 mm
- Actual Bore Diameter: 73.95 mm
- Hub Stroke: 58.00 mm
- Clearance: 0.05 mm
- Compression Height: 23.50 mm
- Dome Volume: +2.40 cm³
- Wossner Compression Ratio: 12.00:1
- OEM Compression Ratio: 9.50:1
Cross-Reference OEM Part Numbers
- Piston: 8724DA
- Lock: CW17
- Pin: WP083
- Ring Set: 740XDS
- Part No.: 56-W4950.A.WO
- OEM Reference: 1S4-11631-20-A0, 40078M07400
Vehicle Fitments
- Yamaha YFM250R Raptor 2008–2013
- Yamaha YBR250 2008–2012
