SPI .020 Over Bore Piston Kit for Yamaha Exciter 570 / II EX570 1987-1993 73.5mm

.020 Over Bore Piston Kit for Yamaha Exciter 570 / II EX570 1987-1993

This .020 over bore piston kit provides a 73.5mm piston for restoring compression in Yamaha Exciter 570 and II EX570 snowmobile engines from 1987 to 1993.

Overview

This .020 over bore piston kit is a direct replacement for worn pistons in Yamaha Exciter 570 and II EX570 snowmobiles. Designed for engines requiring a .020 oversize piston, it restores proper compression and power output. The 73.5mm bore size matches the oversize specification for these models.

Built For Performance

• Precision-machined .020 oversize piston for exact fit
• 73.5mm piston diameter for optimal cylinder clearance
• High-strength cast aluminum construction for durability
• Includes piston rings, wrist pin, and circlips
• Compatible with stock connecting rods and bearings
• Designed to meet OEM specifications

Fits These Machines

• for Yamaha Exciter 570 (1987-1993)
• for Yamaha Exciter II EX570 (1987-1993)

On-The-Job Use

• Rebuilding top end of Yamaha Exciter snowmobile engines
• Restoring compression and performance in high-mileage machines
• Used during full engine overhaul or cylinder reboring
• Replacing original pistons for improved reliability

Specs At A Glance

Good To Know

Q: Is this piston kit a direct replacement for the original? A: This kit is a .020 oversize replacement, so the cylinder must be bored to match. Always check piston-to-wall clearance and ring gap before installation.

Q: Does this kit include everything needed for installation? A: The kit typically includes the piston, rings, wrist pin, and circlips. Additional gaskets and seals are sold separately.

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