2 SPI Standard Bore Piston Kits for Yamaha EX440 Exciter GP433 GP440 PR440 68mm

2 SPI Standard Bore Piston Kits for Yamaha

This set of two standard bore piston kits provides a direct replacement for Yamaha EX440, Exciter, GP433, GP440, and PR440 models with a 68mm bore, offering OEM cross-reference compatibility for restoring or rebuilding 440cc engines.

Overview

These 2 SPI standard bore piston kits are designed to rebuild Yamaha 440cc snowmobile engines, delivering reliable performance for vintage models such as the EX440, Exciter, GP433, GP440, and PR440. Each kit includes the piston, rings, wrist pin, and circlips, making it a complete solution for engine overhauls. The standard bore configuration ensures direct fitment without the need for cylinder boring.

Built For Performance

• Precision-machined from high-strength aluminum alloy for durability
• Includes premium piston rings for proper sealing and compression
• Each kit comes with a wrist pin and circlips for easy installation
• Direct replacement for OEM pistons, no modifications required
• Designed for standard 68mm bore, ideal for OEM-spec rebuilds

Fits These Machines

• for Yamaha EX440
• for Yamaha Exciter
• for Yamaha GP433
• for Yamaha GP440
• for Yamaha PR440

On-The-Job Use

• Restoration of classic Yamaha snowmobiles
• Rebuilding 440cc two-stroke engines
• Replacing worn or damaged pistons during top-end overhaul
• Maintaining performance for vintage snowmobile enthusiasts

Specs At A Glance

Good To Know

Q: Are these piston kits compatible with racing applications? A: These standard bore kits are intended for stock rebuilds; for high-performance builds, consider forged or oversize options.

Q: What components are included with each kit? A: Each kit includes the piston, piston rings, wrist pin, and circlips, providing everything needed for a complete piston replacement.

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