SPI Standard Bore Piston Kit for Yamaha SS 440 fits 1980-1985 SS440 - 66mm

SPI Standard Bore Piston Kit for Yamaha SS 440

This SPI standard bore piston kit is a direct replacement piston assembly designed to restore compression and power in Yamaha SS 440 snowmobiles from 1980 through 1985, featuring a 66mm bore size.

Overview

This SPI standard bore piston kit provides a high-quality aftermarket piston for Yamaha SS 440 models, delivering reliable performance and a precise fit for 1980-1985 snowmobiles. The kit includes the piston, rings, and wrist pin for a complete top-end rebuild, making it a cost-effective solution for restoring lost power and compression in your Yamaha SS 440.

Built For Performance

• Precision-machined from high-silicon aluminum alloy for strength and heat dissipation
• Includes a wrist pin and circlips for secure installation
• Ring set engineered for optimal compression and oil control
• Standard bore size (66mm) for cylinders within factory specifications
• Compatible with Yamaha SS440 engines from 1980-1985

Fits These Machines

• for Yamaha SS 440 (1980-1985)
• for Yamaha SS440 (1980-1985)

On-The-Job Use

• Rebuilding the top end of a Yamaha SS 440 snowmobile engine
• Replacing a failed or worn piston to restore engine performance
• Performing a complete engine overhaul for increased reliability
• Used in vintage snowmobile restoration projects

Specs At A Glance

Good To Know

Q: Do I need to replace the piston rings when installing this kit? A: Yes, the kit includes new rings, and it is recommended to always install fresh rings with a new piston to ensure proper sealing and break-in.

Q: Can I use this piston kit with a cylinder that has been previously bored? A: This is a standard bore piston, so the cylinder must be at original size; if it has been bored oversize, you will need an overbore piston kit.

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