Namura .040 Over Bore Piston Kit for Polaris 570 Sportsman, RZR & Ranger 100mm
Namura .040 Over Bore Piston Kit for Polaris 570 Sportsman, RZR & Ranger 100mm
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.040 Over Bore Piston Kit for Polaris 570 Sportsman, RZR & Ranger
This aftermarket .040 over bore piston kit for Polaris 570 Sportsman, RZR, and Ranger models provides a 100mm replacement piston designed to restore compression and performance in worn engines.
Overview
This .040 over bore piston kit is a direct replacement for Polaris 570 Sportsman, RZR, and Ranger engines, offering a 100mm bore size to refresh top-end power. It includes a piston, rings, and wrist pin for a complete rebuild. Ideal for restoring lost compression and reducing oil consumption in high-mileage machines.
Built For Performance
- Precision-machined 100mm piston with .040 overbore for tight cylinder clearance
- High-strength aluminum alloy construction for durability under load
- Includes premium piston rings for optimal sealing and reduced blow-by
- Wrist pin with retention clips for secure installation
- Designed to meet or exceed OEM specifications for reliable performance
Fits These Machines
- for Polaris Sportsman 570 (all years using 100mm bore)
- for Polaris RZR 570 (all years using 100mm bore)
- for Polaris Ranger 570 (all years using 100mm bore)
On-The-Job Use
- Trail riding and recreational off-road use
- Utility farming and ranching tasks requiring reliable engine power
- Engine rebuilds for ATVs and side-by-sides needing top-end refresh
- Racing or high-performance applications where consistent power is critical
Specs At A Glance
| Bore Size | 100mm |
| Overbore | .040 inches |
| Piston Material | High-strength aluminum alloy |
| Included Components | Piston, rings, wrist pin, clips |
Good To Know
Q: Will this piston fit my Polaris 570 without additional machining? A: This .040 over bore piston requires the cylinder to be bored to the correct clearance for the new piston. Professional machining is recommended.
Q: Can I use this piston kit for a complete engine rebuild? A: Yes, this kit includes the piston, rings, wrist pin, and clips needed for a top-end rebuild. Always replace the cylinder bore and check ring end gap per service manual.
Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.
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