MERCURY YAMAHA 505060 Propeller 13-3/4 90-225

( Brand: Mercury Yamaha ), ( Manufacturer Part Number: 505060 ), ( Part Type: Hp Propeller ), ( Country Of Manufacture: United States ), ( Donor Motor: Loose )

Review MERCURY YAMAHA 13-3/4 Stainless Propeller Hp Month Warranty fits 1978–2025

The **Mercury Yamaha 505060 13-3/4" 25" Propeller (90-225 HP, 1978)** is a meticulously crafted, high-performance marine propeller designed for classic outboard engines from the late 1970s, offering a perfect blend of durability, efficiency, and vintage reliability. Engineered for Mercury and Yamaha marine engines producing between **90 and 225 horsepower**, this propeller features a **13-3/4-inch pitch** and a **25-inch diameter**, making it ideal for mid-sized boats ranging from sportfishing vessels to cruisers and performance boats built during the era. Its robust construction ensures smooth operation while maximizing thrust and fuel efficiency, allowing for optimal acceleration and handling on the water. The propeller s **four-blade design** strikes a balance between speed and torque, making it well-suited for both recreational and light to moderate workboat applications. Crafted from high-grade, corrosion-resistant materials, this propeller is built to withstand the demands of saltwater environments, ensuring longevity even with regular use. Whether restoring a classic boat or maintaining a beloved vessel from the late '70s, this propeller delivers the performance and reliability expected from a premium marine component. Its precise dimensions and engineering make it a sought-after replacement for enthusiasts seeking to restore original functionality while preserving the authenticity of their watercraft.

### **Pros and Cons of Buying a 1978 Mercury-Yamaha 505060 13-3/4" 25" Propeller (90-225 HP)**

#### **Pros**

1. **Classic V-Drive Design** The 505060 series is known for its durable V-drive transmission, which is simpler and more reliable than modern outboard designs. This makes it easier to repair and maintain compared to some newer models with complex electronics.

2. **Proven Reliability** Built in the late 1970s, these engines were designed for heavy-duty use and were widely used in commercial and recreational fishing boats. Many still operate well today with proper maintenance.

3. **High Power-to-Weight Ratio** With a range of 90 225 HP, this engine was designed for performance, making it suitable for larger boats or those needing strong acceleration.

4. **Mechanical Simplicity** Unlike modern outboards with fuel injection and complex electronics, this engine relies on carburetors and mechanical linkages, which can be easier to troubleshoot and repair without advanced diagnostic tools.

5. **Resale Value for Classic Boats** If you plan to restore or keep the engine for a vintage boat, it may hold value among collectors or enthusiasts of classic marine engines.

6. **Compatibility with Older Boats** Many older boats were built to accommodate this type of engine, making it a straightforward fit for restoration projects.

7. **Lower Initial Cost** Compared to modern high-performance outboards, this engine is relatively inexpensive to purchase, especially if it s been well-maintained.

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#### **Cons**

1. **Age and Wear** At 45 years old, the engine likely has significant wear on internal components like pistons, bearings, and seals. Without thorough inspection and maintenance, it may require major overhauls or replacement parts.

2. **Fuel and Emissions Standards** Modern marine fuels contain additives that can damage older engines. Running it on modern fuel without proper additives (like marine diesel or two-stroke oil for outboards) could lead to clogged carburetors or engine damage.

3. **Lack of Modern Technology** No electronic ignition, fuel injection, or advanced diagnostics mean troubleshooting issues can be time-consuming. You ll need mechanical expertise to diagnose and fix problems.

4. **Environmental Concerns** If it s a two-stroke engine (common in this era), it produces more pollution than modern three-stroke or four-stroke outboards. Operating it may violate current emissions regulations in some areas.

5. **Part Availability** While some parts are still available, others may be discontinued or require sourcing from specialty suppliers. Rebuilding the engine could be challenging due to limited modern support.

6. **Fuel Efficiency** Older engines are less efficient than modern counterparts, consuming more fuel for the same power output.

7. **Potential for Hidden Damage** Rust, corrosion, or internal wear may not be immediately visible. A professional inspection is essential before purchasing to avoid costly repairs.

8. **No Warranty or Support** Unlike new engines, you won t have manufacturer warranties or authorized service centers for repairs.

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### **Conclusion**

A 1978 Mercury-Yamaha 505060 engine can be a great purchase if you re looking for a **restoration project, a classic boat setup, or a budget-friendly power source** for a smaller vessel. Its durability and mechanical simplicity make it appealing to those who enjoy hands-on maintenance. However, it requires **significant upfront investment in inspection, repairs, and potential overhauls** to ensure reliability.

If you re an experienced mechanic, enjoy working on older engines, and have the time and resources to restore it properly, this could be a rewarding buy. For someone seeking a **plug-and-play, low-maintenance engine**, a modern outboard would be a far better choice.

### **Recommendation**

- **Buy if:** You have a specific use for a vintage engine (e.g., a classic boat restoration), you re prepared for repairs, and you re okay with the limitations of an older design.

- **Skip if:** You need a reliable, low-maintenance engine for regular use, are concerned about emissions or fuel efficiency, or don t have the mechanical skills to maintain it properly.

- **Before purchasing:** Have a marine mechanic perform a **full inspection**, including compression tests, propeller shaft and bearing checks, and fuel system evaluation. Consider whether the cost of restoring it justifies its value compared to a newer, more efficient engine.

Details:

Gear case: 4-1/4, Spline Count: 15, Hub: Factory, Hub Status: Installed. Buyer pays return shipping. Pre-owned propeller with light cosmetic wear. Light surface rust, Minor cosmetic defects.

Diameter Pitch: 13-3/4 25, Rotation: Right Hand Standard, Blades: 4, Material: Stainless Steel. Altman, IL. If it spins, we'll replace.

505060 Yamaha 13-3/4 x 25 Stainless Propeller 90-225 HP 1978 6 MONTH WARRANTY Details. No cracks, bends, or welds. Please verify by model or serial number before purchasing. Yamaha 3-Cl 2-Stroke - 60-90 HP 1984-2005 4-Cl 100-130 1984-2003, 4-Cl 4-Stroke 75-115 1999 Newer T50 T60 High Thrust 1996 Newer F70 2010 F75 2003 F80 1999-2002, F90 F100 1999-2002 F115 2000 Newer.

Size Matters. South central Outboards. Hub installed and tested.

part #: 505060 prices

• $43.45-$325.00

specifications ouboaen:

• for makes: Mercury
• for years: 1978-2025
• brand: Mercury Yamaha
• mpn: 505060
• part type: Hp Propeller
• country of manufacture: United States
• donor motor: Loose

general ouboaen:

• condition: Used
• Boat Parts > Outboard Engines Components > Other

payments ouboaen:

• other
• wallet: Apple-pay
• credit card: Diners-club

offer ouboaen:

• sold: 0
• quantity: 1
• options: Ship-to-home
• started: May 12, 2026
• availability: In Stock

seller ouboaen:

• # reviews: 35103
• rating: 99.9%
• city: Altamont, Illinois

shipping ouboaen:

• type: Fixed
• cost: $0.00
• class: Standard
• transit: 2-6 Days
• service: Standard

returns ouboaen:

• policy: No Returns

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