Yamaha SR 500 [1978-1989] - WÖSSNER Pro Series forged pistons

WÖSSNER Pro Series forged pistons for Yamaha SR 500

The WÖSSNER Pro Series forged piston is designed as a forged aluminum piston with standard piston compression. The defined dimensions and technical characteristics support a targeted selection of the intended engine structure of the Yamaha SR 500.

Technical features

• Material: aluminum
• Piston Type: Forged
• Piston compression: standard
• Diameter Ø: 87.43 mm
• Letter oversize: 050
• Oversize: +0.05
• Bore diameter: 87.50 mm
• Compression ratio: 9.9:1
• Rings Quantity: 3
• Stroke: 4T

Vehicle assignment

The forged piston is intended for the Yamaha SR 500 from the full model year range 1978-1989. The assignment refers exclusively to this model and this year of manufacture.

Selection based on dimensional data

The diameter of 87.43 mm, the bore diameter of 87.50 mm and the marking of the oversize with 050 and +0.05 are particularly relevant for the technical selection. The compression ratio is 9.9:1. The version with three rings and the designation “4T” on the stroke complements the key technical data of the piston.