SPI .020 Over Bore Piston Kit for Yamaha EX440 Exciter GP433 GP440 PR440 68.5mm

SPI .020 Over Bore Piston Kit for Yamaha

This SPI .020 over bore piston kit is designed for Yamaha EX440 Exciter GP433 GP440 and PR440 engines featuring a 68.5mm bore size to deliver smooth operation and long service life.

Overview

The SPI .020 over bore piston kit is an ideal solution for restoring your Yamaha snowmobile engine. This over bore piston kit increases the cylinder bore by .020 inches to compensate for wear using a 68.5mm piston. It is specifically engineered for the EX440 Exciter GP433 GP440 and PR440 models ensuring a precise fit and reliable performance.

Built For Performance

• Includes piston rings wrist pin and circlips for a complete rebuild
• Constructed from durable aluminum alloy for high strength and heat resistance
• Oversized .020 over bore allows cylinder repair without replacement
• Precision machined to exacting tolerances for consistent compression
• Designed for high-revving snowmobile engines to withstand demanding conditions

Fits These Machines

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

On-The-Job Use

• Used for rebuilding snowmobile engines after cylinder wear
• Ideal for restoring lost compression and power output
• Commonly used in recreational trail riding and racing applications
• Suitable for engine overhauls and top-end rebuilds

Specs At A Glance

Good To Know

Q: What is the benefit of using an over bore piston kit? A: An over bore piston kit allows you to restore engine compression by enlarging the cylinder bore accommodating a larger piston to compensate for wear.

Q: Can this kit be used on other Yamaha models? A: This kit is specifically designed for the EX440 Exciter GP433 GP440 and PR440; always verify your cylinder bore size and serial number before ordering.

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