PISTON KIT 88-91 YZ250 68.50, WOSSNER 8134D050 YAMAHA MX

Wossner Forged Piston Kit 68.50mm Bore for Yamaha YZ250/WR250 (1988-1991)

Upgrade your 1988-1991 Yamaha YZ250 or WR250 engine with this high-performance Wossner forged piston kit. Engineered for 2-stroke applications, this piston boasts a 68.50 mm bore size and a 68.44 mm piston diameter, representing a +0.50 mm oversize for enhanced performance and reliability.

Wossner pistons are manufactured in Germany using advanced forging techniques. This process creates a stronger, more durable piston that can withstand higher temperatures and pressures compared to cast pistons. The forged construction, combined with an optimized elliptical design, ensures even load distribution and efficient heat transfer away from the combustion chamber. This leads to reduced wear, a lower risk of piston failure, and improved thermal efficiency for your engine.

Key Features:

• Forged Construction: Provides superior strength and durability for demanding conditions.
• Optimized Thermal Efficiency: Designed to effectively transfer heat away from the combustion chamber.
• Elliptical Piston Geometry: Promotes balanced load distribution, accommodating thermal expansion smoothly.
• Precision Engineered: Manufactured to exacting standards in Germany for dependable performance.
• Oversize Bore: 68.50 mm bore with a 68.44 mm piston diameter (+0.50 mm oversize).

Specifications:

• Bore Size: 68.50 mm
• Piston Diameter: 68.44 mm
• Engine Displacement: 246 cm³
• Stroke: 68.00 mm
• Clearance: 0.06 mm
• Compression Height: 36.00 mm
• Compression Ratio: 2-stroke (Compatible with Wossner and OEM specifications)

Wossner Part Cross-Reference:

• Piston Kit: 8134D050
• Lock Ring: CW18
• Wrist Pin: WP033
• Ring Set: RSB68500 (x2 required)