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

Wossner Forged Piston Kit 68.50mm Bore – Yamaha YZ250 / WR250 (1988–1991)
This Wossner forged piston kit is designed for Yamaha YZ250 and WR250 models from 1988 to 1991. With a bore size of 68.50 mm and a piston diameter of 68.44 mm (+0.50 mm oversize), it is crafted for 2-stroke engine setups requiring improved strength and thermal efficiency. The forged aluminium design and elliptical geometry ensure even load distribution and effective heat transfer, reducing wear and the risk of piston failure. Manufactured in Germany for dependable performance.

Features

• Forged construction for superior durability and strength

• Optimised design for combustion chamber heat transfer

• Elliptical shape promotes balanced load distribution under thermal expansion

• Precision-engineered in Germany

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 (Wossner and OEM)

Cross-Reference Wossner Part Numbers

• Piston Kit: 8134D050

• Lock: CW18

• Pin: WP033

• Ring Set: RSB68500 x 2

Vehicle Fitments

• Yamaha YZ250 (1988–1991)

• Yamaha WR250 (1988–1991)

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.