Namura .040 Over Bore Piston Rings for Polaris Big Boss 250 4x6 6x6 1989-93 73mm
Namura .040 Over Bore Piston Rings for Polaris Big Boss 250 4x6 6x6 1989-93 73mm
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.040 Over Bore Piston Rings for for Namura
These .040 over bore piston rings for for Namura provide an essential seal for rebuilt 73mm bores on Polaris Big Boss 250 machines.
Overview
Engine builders select these .040 over bore piston rings for for Namura when restoring performance to worn Polaris engines. The .040 over bore piston rings for for Namura maintain critical combustion chamber pressure for reliable operation. Precision tolerances ensure these .040 over bore piston rings for for Namura perform under load.
Built For Performance
- Designed for 73mm cylinder bores
- Resists thermal fatigue
- High-precision manufacturing
- Optimized ring tension
- Durable metallurgical composition
Fits These Machines
- for Polaris Big Boss 250 4x6 1989-1993
- for Polaris Big Boss 250 6x6 1989-1993
On-The-Job Use
- Engine overhaul projects
- Restoring compression in heavy-duty utility quads
- Improving seal in aged cylinder bores
Specs At A Glance
| Bore Size | 73mm |
| Over Size | .040 |
Good To Know
Q: Do I need to replace the piston? A: It is standard practice to use a matching oversized piston with these rings.
Q: How do these rings handle heat? A: These rings are designed to withstand the high temperatures of air-cooled 250cc engines.
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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