2 SPI .020 Over Bore Piston Kits for Yamaha EX440 Exciter, GP440 & PR440 68.5mm

2 SPI .020 Over Bore Piston Kits for Yamaha

These SPI .020 over bore piston kits are designed for Yamaha EX440 Exciter, GP440, and PR440 snowmobile engines, with a 68.5mm bore size.

Overview

The SPI .020 over bore piston kits provide a direct replacement for worn pistons in Yamaha EX440, GP440, and PR440 engines. Each kit includes a piston, rings, and wrist pin for a complete rebuild. These aftermarket pistons are made to match original dimensions for reliable performance.

Built For Performance

• 0.020-inch oversize for machining worn cylinders
• 68.5mm piston diameter for precise fit
• Includes rings and wrist pin for complete installation
• Manufactured from high-strength aluminum alloy
• Designed for Yamaha 440cc engines

Fits These Machines

• for Yamaha EX440 Exciter
• for Yamaha GP440
• for Yamaha PR440

On-The-Job Use

• Engine rebuilding and restoration
• Replacing worn pistons in snowmobile engines
• Performance rebuilds with overbore cylinders
• Seasonal maintenance for Yamaha 440cc models

Specs At A Glance

Good To Know

Q: Are these piston kits from a known brand? A: Yes, these are SPI brand piston kits, a reputable aftermarket manufacturer known for quality snowmobile and powersports components.

Q: Do I need to machine the cylinder for an overbore? A: Yes, a 0.020 over bore piston requires the cylinder bore to be machined to the corresponding oversize to maintain proper clearance and performance.

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