SPI .020 Over Bore Piston Kit for Yamaha Excel III 340 fits 1981-1988 60.5mm

SPI .020 Over Bore Piston Kit for Yamaha Excel III 340

This SPI .020 over bore piston kit is designed to restore compression and performance in Yamaha Excel III 340 engines from 1981 to 1988 with a 60.5mm bore.

Overview

The SPI .020 over bore piston kit provides a direct replacement for worn pistons in Yamaha Excel III 340 snowmobile engines. This 60.5mm piston kit increases displacement slightly while maintaining reliable operation. Ideal for rebuilding engines from 1981 to 1988 models.

Built For Performance

• 0.020-inch overbore increases displacement for added power.
• High-strength aluminum alloy construction for durability.
• Precision-machined ring grooves ensure proper ring sealing.
• Includes piston rings and wrist pin for complete installation.
• Designed to match OEM specifications for reliable fit.

Fits These Machines

• for Yamaha Excel III 340 (1981-1988)

On-The-Job Use

• Restoring engine compression in snowmobiles.
• Rebuilding high-mileage Yamaha Excel III 340 engines.
• Performing top-end overhaul for improved performance.

Specs At A Glance

Good To Know

Q: Will this piston kit work with my stock cylinder?A: This 0.020 overbore piston requires the cylinder to be bored to match. A professional machine shop should perform the bore and hone for proper clearance.

Q: Are the piston rings included?A: Yes, the kit includes rings and a wrist pin, though wrist pin circlips may need to be reused or purchased separately.

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