Namura .060 Over Bore Piston Kit for Polaris Big Boss 250 4x6 6x6 1989-93 73.5mm

.060 Over Bore Piston Kit for Polaris Big Boss 250

This Namura .060 over bore piston kit is designed for Polaris Big Boss 250 4x6 and 6x6 models from 1989 to 1993, with a 73.5mm bore. It provides a precise oversize fit for cylinder reconditioning, restoring engine power and reliability. Ideal for rebuilding top ends on these classic workhorse ATVs.

Overview

This .060 over bore piston kit from Namura is a direct replacement for Polaris Big Boss 250 4x6 and 6x6 ATVs (1989-1993) with a 73.5mm bore. It renews cylinder compression after overboring the cylinder. Perfect for bringing worn engines back to like-new condition.

Built For Performance

• High-strength aluminum alloy construction
• Precision-machined for .060 overbore clearance
• Moly coated skirt minimizes friction
• Quality piston rings for optimal sealing
• Includes wrist pin and circlips
• Manufactured to exacting specifications

Fits These Machines

• for Polaris Big Boss 250 4x6 (1989-1993)
• for Polaris Big Boss 250 6x6 (1989-1993)

On-The-Job Use

• Heavy utility work and trail maintenance
• Farm and ranch operations requiring reliable power
• Off-road recreational riding
• Engine rebuilds for older model ATVs

Specs At A Glance

Good To Know

Q: Will this .060 over piston kit work on a 1991 Polaris Big Boss 250 6x6? A: Yes, it fits 1989-1993 Big Boss 250 4x6 and 6x6 models. Ensure your cylinder has been bored to 73.5mm.

Q: What is included in this piston kit? A: The kit includes the piston, rings, wrist pin, and circlips. Always compare with your original components before installation.

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