Namura .040 Over Bore Piston Rings for Polaris Trail Boss 250 1985-1999 73mm
Namura .040 Over Bore Piston Rings for Polaris Trail Boss 250 1985-1999 73mm
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.040 Over Bore Piston Rings for Polaris
These .040 over bore piston rings provide the necessary compression seal for rebuilt engines. These .040 over bore piston rings are manufactured for durability in two-stroke engines.
Overview
The .040 over bore piston rings are required when the cylinder has been bored out to accommodate a larger piston. Installing new .040 over bore piston rings restores power and prevents blow-by in the combustion chamber. Precision engineering makes these .040 over bore piston rings a standard choice for engine repair.
Built For Performance
- Heat resistant alloy construction
- Precision sizing for bore clearance
- Optimized tension for compression sealing
- Engineered for high-RPM operation
- Durable against ring groove wear
Fits These Machines
- for Polaris Trail Boss 250 1985-1999
On-The-Job Use
- Engine top end rebuilds
- Cylinder machining projects
- Restoring compression lost to wear
Specs At A Glance
| Size | .040 Over Bore |
| Bore Diameter | 73mm |
Good To Know
Q: Do I need to hone the cylinder? A: Yes, a proper hone pattern is necessary to seat new rings correctly.
Q: Are these for a stock piston? A: No, these are specifically sized for an .040 overbore piston.
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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