SPI .040 Over Bore Top End Kit for Yamaha 480 Phazer & Venture 1991-1999 73mm

SPI .040 Over Bore Top End Kit for Yamaha

This SPI .040 over bore top end kit rebuilds the cylinder head and piston assembly for Yamaha 480 Phazer and Venture models from 1991 to 1999 with a 73mm bore.

Overview

The SPI .040 over bore top end kit is a complete replacement set for the top half of the engine, designed for Yamaha 480cc Phazer and Venture snowmobiles and ATVs. It includes a piston, rings, wrist pin, and gaskets to restore compression and power. This kit is intended for engines needing a .040 inch overbore to refresh worn cylinders.

Built For Performance

• Includes precision-ground piston matched to a .040 overbore spec
• Durable cast rings for long service life
• Complete gasket set for a leak-free installation
• Direct fit for 73mm bore Yamaha 480 engines
• Engineered to meet OEM specifications

Fits These Machines

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

On-The-Job Use

• Restores top end performance on high-mileage engines
• Suitable for recreational snowmobiling and trail riding
• Commonly used during engine rebuild projects
• Ideal for mechanics repairing Yamaha 480cc two-stroke engines

Specs At A Glance

Good To Know

Q: Does this kit include the cylinder jug? A: No, this is a top end kit containing only the piston, rings, pin, and gaskets; the cylinder must be bored to .040 over by a machine shop if not already done.

Q: Can this be used on a stock bore cylinder? A: No, it is designed for .040 overbore cylinders only; the cylinder must be machined to match the oversized piston.

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