OEM Ring Set .030 391416 for OMC, Johnson and Evinrude outboard engines with cylinders bored .030″ over standard size. This ring set is designed for use on the .030 Oversized Pistons
Piston rings play a critical role in every 2-stroke engine. They seal combustion pressure, transfer heat from the piston to the cylinder wall, and help maintain efficient engine operation. Worn, damaged, or improperly sized rings can lead to compression loss, poor performance, difficult starting, and reduced engine life.
This ring set is manufactured to provide the proper fit and sealing characteristics required for .030 oversize applications. Whether you’re completing a full engine rebuild or replacing damaged rings during repair, proper ring fitment is essential for long-term reliability.
At Liquid Revolutions, we’ve rebuilt countless Johnson and Evinrude engines over the years. One thing we’ve learned is that quality ring seal is critical to making power, maintaining compression, and ensuring long engine life. Whether it’s a recreational outboard or a race ready power heads.
Key Features & Benefits
- Ring Set .030 Oversize – Designed for cylinders bored .030″ over standard size
- Restores Compression – Helps maximize cylinder sealing and engine efficiency
- Improves Ring Seal – Supports stronger performance and better combustion
- OEM Replacement – Compatible with select OMC, Johnson and Evinrude outboards
- Ideal for Engine Rebuilds – Perfect for overbore repairs and restoration projects
- Supports Long Engine Life – Proper ring seal helps reduce wear and improve reliability
Why Piston Rings Matter
Properly fitted piston rings help:
- Maintain compression
- Improve combustion efficiency
- Maximize horsepower
- Transfer heat from the piston
- Reduce blow-by
- Improve engine reliability
Without good ring seal, even the best engine build will struggle to perform as intended.
Common Signs of Worn Rings
- Low compression readings
- Hard starting
- Loss of power
- Excessive blow-by
- Poor throttle response
- Increased fuel consumption
Whether you’re rebuilding a recreational outboard or assembling a high-performance race engine, the OEM Ring Set .030 Oversize provides the proper fit and sealing performance needed to restore compression, maximize power, and ensure long-lasting reliability.
Replaces: 0318418, 0323329, 0384718, 0385811, 0388907, 0778433
