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

SPI .020 Over Bore Piston Kit for Yamaha

This .020 over bore piston kit is designed for Yamaha Excel V 540 and XLV 540 snowmobile engines manufactured from 1979 through 1990, providing a fresh bore surface for worn cylinders.

Overview

The SPI .020 over bore piston kit is a direct replacement for Yamaha Excel V 540 and XLV 540 models requiring a 73.5mm bore after a .020 overbore. It includes the piston, rings, and wrist pin for a complete top-end rebuild. This kit is intended for snowmobile owners restoring the performance of 1979-1990 Yamaha two-stroke engines.

Built For Performance

• Cast from durable aluminum alloy with reinforced skirt for strength
• Precision-ground rings provide consistent compression and oil control
• .020 over bore size allows restoring cylinder roundness
• Includes new wrist pin and circlips for secure installation
• Designed to match OEM specifications for reliable fitment

Fits These Machines

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

On-The-Job Use

• Snowmobile trail riding and backcountry exploration
• Engine rebuilds after top-end failure or compression loss
• Restoration of vintage Yamaha snowmobile performance
• Seasonal maintenance for competitive or recreational use

Specs At A Glance

Good To Know

Q: Do I need to hone or bore the cylinder to use this piston? A: Yes, the cylinder must be bored to 73.5mm to match this .020 over piston – it will not fit a standard 73.0mm bore.

Q: Can this piston be used in other Yamaha 540 engines? A: It is designed specifically for Excel V 540 and XLV 540 models; always confirm compatibility with your engine's specifications before installing.

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