PISTON KIT 05-07 YZF250 77.00, WOSSNER 8612DA 2-RING, 5NL-11631-20-00

Wossner 77mm Forged Piston Kit for Yamaha and Gas Gas Off-Road Motorcycles

Enhance the performance and durability of your off-road motorcycle with this Wossner forged piston kit. Engineered with precision in Germany, this kit features a 77mm bore and a two-ring design for optimal combustion and longevity.

Key Features:

• Forged Piston: Provides superior strength and a robust design capable of withstanding demanding riding conditions.
• Two-Ring Design: Optimized for enhanced performance and extended durability.
• Advanced Heat Transfer: Engineered for efficient heat transfer to cylinder walls, promoting consistent operating temperatures.
• Uniform Bearing Surface: Features an elliptical design that ensures a uniform bearing surface under heat expansion, reducing localized pressure and preventing piston collapse for even thrust load distribution.
• German Manufacturing: Built to exacting standards in Germany, guaranteeing high quality and precision.

Specifications:

• Bore Size: 77.00mm
• Piston Type: Standard Size (PN# 8612DA)
• Lock Part Number: CW16
• Pin Part Number: WP059
• Ring Set Part Number: 770XAS-2
• Engine Displacement: 249 cm³
• Stroke: 53.6mm
• Piston Clearance: 0.04mm
• Dome Volume: -2.80 cm³
• Compression Height: 22.20mm
• Wossner Compression Ratio: OEM
• OEM Compression Ratio: 12.50:1

Cross-Reference OEM Part Numbers:

• 5NL-11631-20-00
• 5XC-11631-00-00