Namura Standard Bore Piston Kit for Polaris Big Boss 250 4x6 6x6 1989-1993 72mm
Namura Standard Bore Piston Kit for Polaris Big Boss 250 4x6 6x6 1989-1993 72mm
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Standard Bore Piston Kit (72mm) for Polaris Big Boss 250
This Namura standard bore piston kit is a direct replacement for Polaris Big Boss 250 4x6 and 6x6 models from 1989 to 1993, restoring lost compression and power with a 72mm bore size.
Overview
This piston kit from Namura is designed for Polaris Big Boss 250 ATVs, delivering a reliable standard bore replacement that renews engine performance. It includes a high-strength piston, rings, wrist pin, and circlips, making it a complete solution for top-end rebuilds.
Built For Performance
- Precision-machined 72mm piston from forged aluminum alloy
- Moly-coated skirt reduces friction and wear
- Included chrome-plated rings for improved seal and durability
- Quality wrist pin and circlips ensure secure installation
- Tested to meet OEM specifications for reliable fit and function
Fits These Machines
- for Polaris Big Boss 250 4x6 (1989-1993)
- for Polaris Big Boss 250 6x6 (1989-1993)
Specs At A Glance
| Bore Size | 72mm |
| Oversize | Standard (0.00mm over) |
| Compatible Engines | Polaris Big Boss 250 (1989-1993) |
Good To Know
Q: Does this piston kit include all necessary components? A: Yes, the kit comes with the piston, rings, wrist pin, and circlips – everything needed for a standard bore rebuild.
Q: Can I install this without removing the engine? A: While possible on some models, we recommend removing the cylinder head and barrel for proper installation and inspection of the cylinder wall.
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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