4045M08700 Wiseco Std Piston Kit for Yamaha SR500 1978-1981 87.00 mm 10:1 CR

Wiseco Std Piston Kit for Yamaha SR500

This Wiseco standard bore piston kit, OEM cross-reference 4045M08700, is a 87.00 mm forged piston assembly with a 10:1 compression ratio built for Yamaha SR500 engines.

Overview

This Wiseco Std Piston Kit for Yamaha SR500 delivers a forged piston, rings, wrist pin, and clips for a fresh top end on 1978-1981 SR500 models. The 87.00 mm bore and 10:1 compression ratio keep the engine close to factory specification for everyday riding and trail use. Riders and mechanics rebuilding tired SR500 engines get dependable Wiseco quality in one box.

Built For Performance

• Forged aluminum piston construction for strength under heat and load
• 10:1 compression ratio suited to stock and lightly modified SR500 engines
• 87.00 mm standard bore size matches the original cylinder dimensions
• Kit includes piston, rings, wrist pin, and circlips for a complete top end rebuild
• OEM cross-reference 4045M08700 for easy parts verification

Fits These Machines

• for Yamaha SR500 1978
• for Yamaha SR500 1979
• for Yamaha SR500 1980
• for Yamaha SR500 1981

On-The-Job Use

• Top end rebuilds on 1978-1981 Yamaha SR500 engines
• Restoring compression on a high mileage single cylinder thumper
• Refresh of a classic SR500 before a riding season
• Workshop rebuilds where factory bore size is retained

Specs At A Glance

Good To Know

Q: What is included in this kit? A: The kit arrives as a complete piston assembly with rings, wrist pin, and circlips for a full top end refresh. Inspect the cylinder bore for wear before installation.

Q: Does this fit other Yamaha models? A: Fitment is listed for the SR500 from 1978 through 1981, and the 87.00 mm bore and 10:1 ratio match that engine. Confirm your model and engine year before ordering.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.