PISTON KIT 02-20 YZ85 47.50 C, WOSSNER 8104DC YAMAHA MX

This Wossner forged piston kit with a 47.52mm bore (+0.02mm oversize) is manufactured for Yamaha YZ85 models from 2002 to 2019. Designed for durability and performance in two-stroke applications, it features a precision elliptical profile and is forged in Germany to ensure optimal heat transfer, load balance, and resistance to deformation under thermal expansion.

Features

• Forged construction ensures maximum strength and reliability

• Optimised for efficient combustion heat transfer to cylinder walls

• Elliptical design promotes uniform bearing surface and reduces piston collapse risk

• Made in Germany

Specifications

• Bore: 47.52mm

• Actual Bore: 47.47mm

• 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

Vehicle Fitments

• Yamaha YZ85 2002 – 2019