PISTON KIT 02-20 YZ85 47.50 A, WOSSNER 8104DA YAMAHA MX

This Wossner forged piston kit with a 47.50mm bore is a standard size replacement for Yamaha YZ85 models from 2002 to 2019. Engineered for durability and thermal efficiency in two-stroke engines, this German-made piston utilises advanced materials and design features to ensure consistent performance under high-stress conditions.

Features

• Forged construction provides maximum strength and longevity

• Designed to facilitate optimal combustion heat transfer to the cylinder walls

• Elliptical profile ensures even load distribution and reduces piston collapse risk

• Made in Germany

Specifications

• Bore: 47.50mm

• Actual Bore: 47.45mm

• 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

• 5PA-11631-10-A0

• 09104832

• 805M04750

Vehicle Fitments

• Yamaha YZ85 2002-2019