SPI .010 Over Bore Top End Kit for Yamaha 480 Phazer & Venture 1991-1999 72.25mm

SPI .010 Over Bore Top End Kit for Yamaha

This top end kit includes a piston, rings, wrist pin, and circlips for rebuilding Yamaha 480 Phazer and Venture engines from 1991-1999 with a .010 oversize bore of 72.25mm, restoring compression and performance.

Overview

The SPI .010 Over Bore Top End Kit is a complete piston assembly designed for Yamaha 480 Phazer and Venture snowmobile engines, providing all necessary components to refresh a worn top end. This kit is ideal for mechanics and DIYers tackling a rebuild on these popular 1991-1999 models, using the specified 72.25mm bore.

Built For Performance

• Oversized .010 over bore piston restores cylinder clearance and compression
• Precision-machined 72.25mm piston diameter matches factory oversize specification
• Includes high-quality rings, wrist pin, and circlips for a complete top end rebuild
• Designed to fit Yamaha 480cc two-stroke engines from 1991-1999
• SPI aftermarket construction offers reliable performance at a budget-friendly price

Fits These Machines

• for Yamaha Phazer 480 (1991-1999)
• for Yamaha Venture 480 (1991-1999)

On-The-Job Use

• Rebuilding snowmobile engines that have lost compression due to worn piston and rings
• Restoring top-end power in high-mileage Phazer and Venture models
• Performing a preventive maintenance overhaul during off-season storage

Specs At A Glance

Good To Know

Q: Is this kit compatible with standard bore Yamaha 480 cylinders? A: No, this kit is designed for cylinders already bored .010 over; it will not fit a standard bore. Verify your cylinder has been machined to 72.25mm before ordering.

Q: Does the kit include a gasket set? A: No, this top end kit covers only the piston assembly; you will need to purchase a separate gasket set for the base and head.

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