PISTON KIT 02-20 YZ85 47.50 B, WOSSNER 8104DB YAMAHA MX

This Wossner forged piston kit with a 47.51mm bore (+0.01mm oversize) is designed for Yamaha YZ85 models from 2002 to 2019. Crafted for high-performance two-stroke engines, the piston offers excellent strength, heat management, and reliability. Manufactured in Germany, it features an elliptical design that enhances structural integrity under thermal expansion and mechanical load.

Features

• Forged construction for superior strength and longevity

• Optimised design for efficient combustion heat transfer to cylinder walls

• Elliptical profile ensures even bearing surface and minimises risk of piston collapse

• Made in Germany

Specifications

• Bore: 47.51mm

• Actual Bore: 47.46mm

• Engine Displacement: 85 cm³

• Stroke: 47.80mm

• Clearance: 0.05mm

• Compression Ratio: 2-stroke (Wossner and OEM)

• Compression Height: 26.00mm

• Lock Part Number: CW14

• Pin Part Number: WP058

• Ring Set Part Number: RSB4750

• Con Rod Kit Part Number: P2008

Cross-Reference OEM Part Numbers

• Not specified

Vehicle Fitments

• Yamaha YZ85 2002 - 2019