WOSSNER 74mm PISTON KIT YAMAHA YFM250R RAPTOR 08-13, XT250 13-18

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

Majority of our listings are for a direct replacement for your original part.

Our parts are made of quality and are designed to meet or exceed the original OEM Standards.

Our products are often a cost effective alternative to genuine OEM Parts.

Please note: the models of bike we state in our listings are for general guidance only. Please make sure this item will fit your bike before purchasing. Also, we cannot guarantee fitment to any non-UK models.