2 SPI .020 Over Bore Piston Kits for Yamaha Excel V 540 & XLV 1979-1990 73.5mm

.020 Over Bore Piston Kit for Yamaha Excel V 540 & XLV 1979-1990

This SPI .020 over bore piston kit for Yamaha Excel V 540 and XLV (1979-1990) with a 73.5mm bore is designed to restore compression after cylinder boring.

Overview

This SPI .020 over bore piston kit provides two piston assemblies for Yamaha Excel V 540 and XLV snowmobiles from 1979 through 1990. At 73.5mm bore, it allows a fresh cylinder surface after boring .020 over stock. Each kit includes rings, wrist pin, and circlips for a complete top-end rebuild.

Built For Performance

• Manufactured from durable cast aluminum alloy for reliable cold-start performance
• Each kit contains two pistons for a twin-cylinder engine
• Precision-ground ring lands reduce blow-by and improve compression
• Oversized .020 over bore accommodates worn or scored cylinders
• Includes all necessary hardware for installation

Fits These Machines

• for Yamaha Excel V 540 (1979-1990)
• for Yamaha XLV (1979-1990)

On-The-Job Use

• Ideal for restoring snowmobile engines with cylinder wear
• Commonly used in vintage Yamaha Excel models for winter recreation
• Perfect for engine rebuilds after top-end failure or piston seizure
• Works with 73.5mm cylinder bore after .020 over boring

Specs At A Glance

Good To Know

Q: Can these pistons be used with a stock cylinder? A: No, they require the cylinder to be bored .020 over to 73.5mm; they will not fit a standard 73.0mm bore.

Q: Do these kits include both pistons for a twin engine? A: Yes, the kit supplies two complete piston assemblies for both cylinders of the Yamaha Excel V 540 and XLV.

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