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

Piston Kits for Yamaha

These two SPI .020 over bore piston kits for Yamaha Excel III 340 models from 1981 to 1988 use a 60.5mm bore to restore engine compression and power.

Overview

These SPI .020 over bore piston kits for Yamaha Excel III 340 snowmobiles built between 1981 and 1988 include a pair of pistons, rings, pins, and circlips at a 60.5mm bore. They are designed for engine rebuilds that require an oversize piston after cylinder honing or boring. Each kit provides the necessary components to refresh both cylinders on a twin-cylinder engine.

Built For Performance

• .020-inch oversize (0.50mm) provides proper clearance for reconditioned cylinders
• Includes two complete piston assemblies for a full twin-cylinder rebuild
• High-strength aluminum alloy pistons with balanced weight
• Precision-machined ring grooves for reliable ring seal
• Includes wrist pins and circlips for secure installation

Fits These Machines

• for Yamaha Excel III 340 1981
• for Yamaha Excel III 340 1982
• for Yamaha Excel III 340 1983
• for Yamaha Excel III 340 1984
• for Yamaha Excel III 340 1985
• for Yamaha Excel III 340 1986
• for Yamaha Excel III 340 1987
• for Yamaha Excel III 340 1988

On-The-Job Use

• Snowmobile engine top-end rebuilds
• Trail riding and recreational sled maintenance
• Restoration of vintage Yamaha Excel III models

Specs At A Glance

Good To Know

Q: Will these piston kits work with a stock cylinder bore? A: No, these are .020 over bore pistons and require the cylinder to be bored to the matching 60.5mm size for proper fit.

Q: Are wrist pin bearings included in each kit? A: Each kit includes the wrist pin and circlips, but does not include caged needle bearings if your engine uses them separately.

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