OMC 317505 Lower Cowl Frame 50HP
fits make: Johnson, Evinrude, Omc.
( Brand: Omc ), ( Manufacturer Part Number: 317505 ), ( Part Type: Cowl Frame ), ( Country Of Origin: United States )
Review OMC Johnson Evinrude 50hp Lower Cowl Frame
The **OMC 317505 Johnson Evinrude 50HP Lower Cowl Frame** is a meticulously engineered, high-performance marine component designed to deliver unmatched reliability and efficiency for medium-sized outboard engines. Crafted from durable, corrosion-resistant materials, this lower cowl frame serves as the structural backbone of the Johnson Evinrude 50 horsepower outboard, ensuring optimal airflow and cooling while maintaining a sleek, aerodynamic profile. The frame is precision-machined to exact specifications, guaranteeing a seamless fit with the engine s upper cowl and lower unit, minimizing vibrations and maximizing power transfer. Its robust construction accommodates the engine s internal components, including the drive shaft and cooling system, while also housing critical electrical and hydraulic connections. Whether installed on a sleek fishing boat, a versatile utility vessel, or a high-performance cruiser, this lower cowl frame is engineered to withstand the demands of saltwater environments, heavy loads, and prolonged use without compromising performance. With its streamlined design and robust build, it not only enhances the engine s efficiency but also contributes to the overall aesthetic and functionality of the vessel, making it an essential component for any marine enthusiast seeking dependable power and longevity.
The **OMC 317505 Johnson Evinrude 50HP Lower Cowl Frame** is a popular outboard motor, but like any product, it has advantages and drawbacks depending on your needs. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.
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### **Pros of the Johnson Evinrude 50HP Lower Cowl Frame (OMC 317505)**
1. **Reliability and Durability**
Johnson/Evinrude is a well-established brand with a strong reputation for building durable outboard motors. The 50HP model is designed for mid-sized boats, offering consistent performance in various conditions. Many owners report long-term reliability, especially when properly maintained.
2. **Good Power-to-Weight Ratio**
At 50HP, this motor provides sufficient power for boats up to around 20 25 feet, making it ideal for fishing boats, cruisers, and small wakeboard boats. It strikes a balance between performance and fuel efficiency, avoiding the excessive fuel consumption of larger engines while still delivering strong acceleration.
3. **Lower Cowl Design Benefits**
The lower cowl frame (LCF) is generally easier to work on than a traditional upper cowl frame. The engine is more accessible for maintenance, repairs, and upgrades (e.g., swapping out components like the drive unit or alternator). This can save time and money in the long run.
4. **Fuel Efficiency**
Compared to larger outboards, the 50HP model is relatively fuel-efficient, making it cost-effective for daily use or extended trips. It s also less demanding on fuel systems, reducing the risk of clogs or failures.
5. **Versatility**
This motor can be used in various applications, including:- Fishing boats (trolling, bass fishing, etc.)
- Cruisers and pontoons
- Small wakeboard/surf boats
- Utility boats (e.g., for work or transport)
Its moderate power makes it adaptable to different uses without being overkill.
6. **Aftermarket Support**
Johnson/Evinrude has a large network of dealers, service centers, and aftermarket parts suppliers. Finding replacement parts, upgrades (e.g., performance kits, exhaust systems), or diagnostic tools is relatively straightforward.
7. **Lower Initial Cost Compared to Larger Engines**
At 50HP, the upfront cost is significantly lower than that of 90HP, 115HP, or 150HP outboards. This makes it a budget-friendly option for boat owners who don t need excessive power.
8. **Quiet Operation**
Relative to higher-HP outboards, the 50HP model tends to run quieter, which is beneficial for fishing, stealthy cruising, or areas with noise restrictions.
9. **Compatibility with Older Boats**
If you re retrofitting an older boat or one not designed for high-performance engines, the 50HP motor is a practical choice that won t strain the hull or transom.
10. **Evinrude s EcoThrust Technology (if applicable)**
Some newer models in the Evinrude lineup feature EcoThrust, which improves fuel efficiency and reduces emissions. While not all 50HP models include this, it s worth checking if the specific OMC 317505 you re considering has these features.
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### **Cons of the Johnson Evinrude 50HP Lower Cowl Frame (OMC 317505)**
1. **Limited Performance for High-Speed Boats**
If you plan to use the boat for high-speed cruising, wakeboarding, or towing large skiers, the 50HP may feel underpowered. It s not designed for aggressive use and may struggle with heavy loads or steep wake angles.
2. **Maintenance Requirements**
Like all outboards, the 50HP model requires regular maintenance, including:- Oil and filter changes (critical for longevity)
- Spark plug replacement (every 100 hours or as recommended)
- Cooling system checks (water intake, impeller, and lower unit)
- Drive unit inspections (propeller and shaft)
Neglecting maintenance can lead to costly repairs, such as seized engines or damaged lower units.
3. **Lower Unit Durability Concerns**
The lower unit (drive unit) is a common weak point in outboards, especially in older models. If the motor is not well-maintained, the gears or seals can fail, leading to expensive replacements. Some owners report issues with the lower unit in Evinrude models, though this varies by specific year and build quality.
4. **Fuel and Oil Consumption**
While more efficient than larger engines, the 50HP still consumes fuel and oil over time. For frequent use, the cost of fuel and oil additives (e.g., marine diesel fuel stabilizers) can add up.
5. **Vibration and Roughness**
Some owners report that the 50HP model can be slightly rougher-running compared to smoother, higher-HP engines. This may be more noticeable at higher RPMs or under load. Vibration can also affect comfort, especially in smaller boats.
6. **Depreciation**
Like most outboards, the 50HP model depreciates over time. If you plan to sell it later, the resale value may not be as high as for newer or higher-end models.
7. **Limited Torque for Heavy Loads**
While adequate for most recreational use, the 50HP may struggle with heavy loads such as:- Towing multiple skiers or wakeboarders
- Hauling large trailers or heavy equipment
- Operating in rough water with significant waves
In such cases, the motor may bog down or require excessive throttle.
8. **Noise in Confined Spaces**
While quieter than larger engines, the 50HP can still be loud in enclosed spaces like cabins or small decks. This may be an issue for some owners who prioritize noise reduction.
9. **Potential for Water Ingestion**
If the cooling system isn t properly maintained (e.g., clogged water intake, damaged impeller), the motor can ingest debris or water, leading to overheating or damage. This is a risk with all outboards but requires vigilance.
10. **Compatibility with Some Boats**
If your boat has a weak transom or is not properly balanced, a 50HP motor may cause excessive strain. Always ensure the boat s hull and transom are suitable for the engine s weight and power.
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### **Conclusion**
The **Johnson Evinrude 50HP Lower Cowl Frame (OMC 317505)** is a solid choice for boat owners who need a reliable, mid-sized outboard for fishing, cruising, or light utility work. It offers a good balance of power, fuel efficiency, and accessibility for maintenance. However, it may not be ideal for high-speed or heavy-load applications, where a larger engine (e.g., 90HP or 115HP) would be more appropriate.
The decision to purchase this motor depends on your specific needs:- **Buy it if:** You need a dependable, mid-range engine for a boat under 25 feet, prioritize ease of maintenance, and don t require excessive speed or power.
- **Avoid it if:** You plan to use the boat for high-speed cruising, towing multiple skiers, or heavy-duty tasks, as the 50HP may feel insufficient.
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### **Recommendation**
1. **Verify the Model Year and Condition**
Ensure the motor is in good working condition. Check for signs of wear, such as rust, leaks, or damaged components. If possible, request a service history to confirm maintenance records.
2. **Check for Lower Unit Issues**
The lower unit is a critical component. Inspect the propeller, shaft, and gears for damage or excessive wear. If the lower unit has been replaced recently, that s a positive sign.
3. **Test the Motor Before Purchase**
If buying used, ask the seller to start the motor and demonstrate it running smoothly. Listen for unusual noises (e.g., knocking, grinding) and check for proper acceleration and throttle response.
4. **Consider Upgrades**
If you plan to keep the motor long-term, consider investing in upgrades such as:- A performance exhaust system (e.g., Evinrude s own or aftermarket options)
- A higher-quality propeller for better efficiency
- Marine-grade oil and fuel additives for longevity
5. **Budget for Maintenance**
Allocate funds for regular maintenance, including oil changes, spark plug replacements, and cooling system checks. Neglecting maintenance is the fastest way to incur costly repairs.
6. **Compare with Alternatives**
If you re unsure about the 50HP, consider alternatives:- **40HP Evinrude:** Slightly less power but more fuel-efficient for smaller boats.
- **75HP or 90HP Evinrude:** More power for high-speed or wakeboarding use.
- **Mercury or Yamaha:** Other reputable brands with similar models; compare features and reliability based on your needs.
7. **Purchase from a Reputable Source**
Buy from a licensed dealer or a trusted seller with a warranty or return policy. Avoid "as-is" purchases unless you ve thoroughly inspected the motor yourself.
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### **Final Verdict**
The **Johnson Evinrude 50HP Lower Cowl Frame (OMC 31
Details:
Johnson / Evinrude 50HP lower cowl frame 317505, removed from, 50HP, model # 50ESL72C, 1972.
part #: 317505 prices
- $13.99-$20.97
specifications ouboaen:
- for makes: Johnson, Evinrude, Omc
- brand: Omc
- mpn: 317505
- part type: Cowl Frame
- country of origin: United States
seller ouboaen:
- rating: 99.3%
- # reviews: 904
- city: Eau Claire, Wisconsin
offer ouboaen:
- sold: 0
- started: April 22, 2026
- availability: In Stock
- quantity: 1
- options: Ship-to-home
returns ouboaen:
- policy: No Returns
shipping ouboaen:
- service: USPS Ground Advantage
- transit: 2-5 Days
- cost: $0.00
- class: Standard
- carrier: USPS
- type: Calculated
payments ouboaen:
- credit card: Visa
- wallet: Apple-pay
- other
general ouboaen:
- condition: Used
- Boat Parts > Outboard Engines Components > Other
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