OMC 390510 Piston Ring Set Nos

( Brand: Omc ), ( Manufacturer Part Number: 390510 ), ( Part Type: Ring Piston )

Review OMC Evinrude Johnson Piston Ring Set Brp Nos Oem

The **OMC 390510 Evinrude/Johnson Piston Ring Set (NOS)** is a meticulously engineered, high-performance replacement component designed exclusively for Evinrude and Johnson outboard engines, ensuring optimal combustion efficiency, reduced oil consumption, and extended engine life. Crafted from premium, heat-treated materials, this piston ring set is built to withstand the intense thermal and mechanical stresses of modern marine applications, delivering reliable sealing and minimizing blow-by a common issue that can degrade engine performance and fuel economy. Each ring in the set is precision-machined to exacting tolerances, featuring a carefully balanced combination of cast iron and chrome plating where applicable, to enhance durability and resistance to wear, scoring, and corrosion. The set includes a full complement of compression and oil control rings, tailored to fit specific engine models within the Evinrude/Johnson lineup, ensuring a perfect seal between the piston and cylinder walls. Whether used in high-performance outboards, fishing boats, or recreational vessels, this NOS (New Old Stock) piston ring set guarantees a seamless fit and immediate improvement in engine operation, reducing friction, preventing oil leakage, and maintaining peak horsepower output. Ideal for both professional mechanics and DIY enthusiasts, this genuine OMC part is a trusted solution for restoring or maintaining the peak performance of older or heavily used engines, bridging the gap between classic reliability and modern efficiency.

**Pros and Cons of buying a OMC 390510 Evinrude/Johnson Piston Ring Set (No Stock Number)**

1. **Compatibility** This piston ring set is designed specifically for Evinrude and Johnson outboard engines, ensuring a proper fit and optimal performance. It is part of the OMC (Outboard Marine Corporation) brand, which is a trusted manufacturer in the marine industry.

2. **Performance Improvement** Worn or damaged piston rings can lead to reduced engine efficiency, increased fuel consumption, and loss of power. Replacing them with a new set can restore compression, improve fuel economy, and enhance engine performance.

3. **Prevents Further Damage** If the rings are worn or cracked, they can allow compression gases to escape into the crankcase, leading to oil dilution, reduced lubrication, and potential engine damage. Replacing them proactively can prevent costly repairs.

4. **Ease of Installation** Piston ring sets are relatively straightforward to install, especially if you have basic mechanical experience. The OMC brand often provides clear installation instructions, and many marine mechanics or dealerships can assist if needed.

5. **Cost-Effective Upgrade** Compared to a full engine rebuild or replacement, replacing just the piston rings is a relatively inexpensive solution to restore engine health. It extends the life of the engine without requiring major overhauls.

6. **Warranty Coverage** If purchased from an authorized dealer or a reputable supplier, the piston ring set may come with a warranty, providing peace of mind against defects.

7. **Compatibility with Aftermarket Parts** Since OMC is a well-known brand, these rings are likely to be compatible with aftermarket piston kits or other performance upgrades, making it easier to customize your engine.

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1. **Limited Longevity Without Maintenance** Even with new rings, the engine s overall condition (e.g., cylinder wear, oil quality, or cooling system health) will determine how long the rings last. If the engine has significant internal wear, the rings may wear out quickly, requiring replacement sooner than expected.

2. **Installation Challenges** While the installation process is manageable for experienced DIYers, mistakes can occur, such as improper gap sizing, incorrect torque, or failure to clean the cylinder walls properly. Poor installation can lead to premature wear or even ring breakage.

3. **Cost of Additional Repairs** If the engine has other underlying issues (e.g., scored cylinders, bent connecting rods, or worn bearings), replacing just the rings may not fully resolve performance problems. You may need to address these issues simultaneously, increasing the total repair cost.

4. **Availability and Pricing** Depending on the region, the part may not always be in stock at local marine supply stores, requiring online ordering or shipping. Prices can also vary, and purchasing from unauthorized sellers may risk counterfeit or low-quality parts.

5. **Skill Dependency** If you lack mechanical experience, attempting the installation yourself could lead to errors. In such cases, hiring a professional mechanic may incur additional labor costs, offsetting some of the savings from DIY.

6. **Potential for Overkill** If the engine is nearing the end of its service life or has extensive internal damage, replacing just the rings may not be a cost-effective solution. In such cases, a more comprehensive overhaul or engine replacement might be better.

7. **Environmental and Disposal Considerations** Used piston rings and engine components may require proper disposal, especially if they contain hazardous materials like lead (in older engines). This adds a minor logistical burden compared to simpler repairs.

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The OMC 390510 Evinrude/Johnson piston ring set is a practical and cost-effective solution for restoring engine performance, especially if the engine s other components (e.g., cylinders, bearings, and crankshaft) are in good condition. It is ideal for owners who notice symptoms of worn rings, such as blue smoke from the exhaust, poor fuel efficiency, or loss of power. The brand s reputation for quality and compatibility makes it a reliable choice for marine engines.

However, the decision to purchase and install these rings should be made with careful consideration of the engine s overall health. If the engine has significant internal wear or other issues, addressing those problems concurrently may be necessary to ensure long-term reliability. Additionally, if you lack mechanical experience, consulting a professional mechanic is advisable to avoid installation errors.

For most cases where the engine is otherwise healthy, replacing the piston rings is a smart investment that can extend the engine s life and improve performance without the expense of a full rebuild.

- You are experiencing symptoms of worn piston rings (e.g., blue exhaust smoke, rough idle, poor acceleration).

- The rest of the engine (cylinders, bearings, crankshaft) appears to be in decent condition.

- You are confident in your ability to install it correctly or have access to a mechanic for assistance.

- You want a cost-effective way to restore compression and improve engine efficiency.

- The engine has visible signs of severe internal wear (e.g., scored cylinders, bent rods, or excessive oil consumption).

- You are unsure about the engine s overall condition and would prefer a professional inspection before proceeding.

- The engine is old and may benefit from a more comprehensive overhaul rather than a partial repair.

- **Purchase from an authorized dealer or reputable supplier** to ensure you get genuine OMC parts and avoid counterfeit products. Always verify compatibility with your specific engine model before buying.

Details:

Feel free to reach out with any related questions. Evinrude Johnson OMC Piston Ring Set BRP 390510 NOS OEM Shipping Included. Condition - new old stock Factory OEM Note: this item is part of a large boat parts inventory liquidation. Parts might need cleaned a little or touched up, but we'll mention anything that is concern.

part #: 390510 prices

• $8.06-$10.10

specifications ouboaen:

• for makes: Evinrude, Johnson, Omc
• brand: Omc
• mpn: 390510
• part type: Ring Piston

seller ouboaen:

• city: Knoxville, Tennessee
• # reviews: 1668
• rating: 99.1%

returns ouboaen:

• policy: Returns Accepted
• paid by: Seller
• time: 30 Days

offer ouboaen:

• quantity: 5
• options: Ship-to-home
• availability: In Stock
• started: April 21, 2026
• sold: 0

shipping ouboaen:

• service: USPS Ground Advantage
• cost: $0.00
• carrier: USPS
• type: Fixed
• class: Standard
• transit: 6-9 Days

payments ouboaen:

• credit card: Discover
• wallet: Paypal
• other

general ouboaen:

• condition: New other see details
• Boat Parts > Outboard Engines Components > Other

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