The NAMURA NA-50024K Top End Kit is a complete engine refresh solution for select Polaris 325 ATV models. This kit includes a piston, piston rings, wrist pin, wrist-pin clips, top-end bearing, and gasket kit, providing the key components needed for a reliable top-end rebuild. Designed for a standard 77.95 mm bore with an 11:1 compression ratio, the kit is engineered for dependable fitment and performance in compatible applications.
Built using NAMURA’s hypereutectic casting process, the piston provides higher silicon content to help reduce expansion, improve wear resistance, and withstand elevated cylinder temperatures. The MOS2, or Teflon/molybdenum, coated skirts use a rolled-on application process for a durable bond that helps reduce friction, improve heat transfer, and minimize the risk of cold seizures. Machined smooth heads help reflect combustion heat and reduce carbon buildup, while the anodized dome improves heat resistance and durability.
This NAMURA top-end kit fits 2000–2002 Polaris Magnum 325 2X4 models, 2000–2002 Polaris Magnum 325 4X4 models, 2000–2002 Polaris Trail Boss 325 models, and the 2000 Polaris Xpedition 325. Verify the vehicle model, year, bore specification, and compression requirements before installation. Manufacturer part number NA-50024K and vendor part number 186-5024 identify this application-specific kit.
Features:
- Complete Top End Kit: Includes piston, rings, wrist pin, clips, top-end bearing, and gasket kit.
- Standard Bore: Designed for a 77.95 mm standard bore with an 11:1 compression ratio.
- MOS2-Coated Skirts: Rolled-on Teflon/molybdenum coating helps reduce friction, improve heat transfer, and minimize cold-seizure risk.
- Machined Smooth Head: Helps reflect combustion heat and reduce carbon buildup on the piston crown.
- Anodized Dome: Improves heat resistance and durability for demanding engine conditions.
- Hypereutectic Casting: Higher silicon content helps reduce expansion, improve wear resistance, and withstand increased cylinder temperatures.
- Fitment: Fits 2000–2002 Polaris Magnum 325 2X4, 2000–2002 Polaris Magnum 325 4X4, 2000–2002 Polaris Trail Boss 325, and 2000 Polaris Xpedition 325 models.
- Identification: NAMURA manufacturer part number NA-50024K; vendor part number 186-5024.
Fitment:
2000 Polaris Magnum 325 2X4
2000 Polaris Magnum 325 4X4
2000 Polaris Trail Boss 325
2000 Polaris Xpedition 325
2001 Polaris Magnum 325 2X4
2001 Polaris Magnum 325 4X4
2001 Polaris Trail Boss 325
2001 Polaris Xpedition 325
2002 Polaris Magnum 325 2X4
2002 Polaris Magnum 325 4X4
2002 Polaris Trail Boss 325
2002 Polaris Xpedition 325