YAMAHA 13X17-K2 Steel Propeller Gearcase 4.25

( Manufacturer Part Number: 13X17-K2 ), ( Part Type: Propeller ), ( Propeller Rotation: Standard )

Review YAMAHA Stainless Steel Propeller 13x17 4.25 Gearcase

The **Yamaha 13x17-K2 Steel Propeller** paired with a **4.25 Gearcase** is a premium, high-performance marine propulsion system designed to deliver unmatched speed, efficiency, and reliability for both recreational and competitive boating applications. Engineered with Yamaha s signature precision and durability, this steel propeller features a **13-inch diameter and 17-inch pitch**, optimized for maximum thrust and smooth acceleration across a wide range of RPMs. The **K2 blade design** incorporates advanced hydrodynamics, with carefully contoured surfaces that minimize cavitation and reduce noise while enhancing fuel efficiency. Constructed from **high-grade stainless steel**, this propeller is built to withstand the harshest marine environments, including saltwater corrosion and heavy loads, ensuring long-term performance without compromising strength. The **4.25 gearcase** complements this setup by providing a robust transmission system with a **4.25:1 reduction ratio**, ideal for boats requiring a balance of speed and torque, such as fishing vessels, speedboats, or performance cruisers. Together, this combination offers superior handling, improved fuel economy, and the ability to maintain consistent speeds even under varying load conditions. Whether navigating open water or tackling rough seas, the Yamaha 13x17-K2 steel propeller with the 4.25 gearcase delivers a seamless power transfer, making it a top-tier choice for boaters who demand both performance and endurance.

### **Pros and Cons of buying a Yamaha 13x17-K2 Steel Propeller (13x17, 4.25 Gearcase)**

1. **Durability and Strength** The steel construction makes this propeller highly resistant to corrosion, bending, and wear, especially in saltwater or rough conditions. It is designed to withstand heavy loads and prolonged use without deforming.

2. **Efficiency and Performance** The 13x17 pitch is optimized for mid-range speed and towing, providing a balance between acceleration and cruising efficiency. The 4.25 gearcase is a common, well-supported ratio that works well with most Yamaha outboards, offering good power transfer without excessive strain.

3. **Compatibility** This propeller is designed specifically for Yamaha outboards with a 4.25 gearcase, ensuring proper fitment and optimal performance. It is widely available, making replacements or upgrades easier to source.

4. **Fuel Efficiency** A properly matched propeller (like the 13x17) can improve fuel economy by reducing unnecessary strain on the engine while maintaining good speed and handling.

5. **Versatility** The pitch and diameter make it suitable for a range of applications, including fishing, cruising, and light towing, depending on the boat s weight and engine power.

6. **Long Lifespan** High-quality steel propellers are built to last, reducing the need for frequent replacements and lowering long-term costs.

7. **Reduced Cavitation** The design minimizes cavitation (bubble formation that can damage propellers), which helps preserve both the propeller and the gearcase over time.

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1. **Higher Initial Cost** Steel propellers are generally more expensive upfront than aluminum or composite alternatives. While they last longer, the initial investment may be a barrier for some buyers.

2. **Weight** Steel is heavier than aluminum or plastic, which can slightly reduce maneuverability, especially in smaller boats. This may not be noticeable in larger vessels but could be a minor consideration in lightweight or performance-oriented boats.

3. **Potential for Damage from Foreign Objects** While steel is durable, it can still be damaged by sharp debris (e.g., rocks, fishing line, or sea life) that gets caught in the blades. This can lead to bent or chipped blades, requiring repairs or replacement.

4. **Limited Customization** Unlike some aluminum propellers, steel propellers are less likely to be custom-machined for specific tuning needs. The 13x17 pitch is a standard size, which may not be ideal for every boat s exact requirements.

5. **Maintenance Requirements** While steel resists corrosion better than aluminum, it still requires periodic inspection for pitting, rust, or damage, particularly in saltwater environments. Neglecting maintenance can lead to premature failure.

6. **Potential for Noise** Some users report that steel propellers can produce slightly more noise than aluminum or composite propellers, though this is subjective and depends on the engine and boat setup.

7. **Not Ideal for High-Speed Applications** The 13x17 pitch is better suited for mid-range speeds. For high-speed boats, a finer pitch (e.g., 12x17 or smaller) may offer better performance and reduced strain on the engine.

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### **Conclusion**

The **Yamaha 13x17-K2 steel propeller** is an excellent choice for boat owners seeking **durability, efficiency, and long-term reliability**, particularly for mid-range applications like fishing, cruising, or light towing. Its steel construction ensures resistance to corrosion and wear, while the 4.25 gearcase compatibility guarantees a smooth fit with Yamaha outboards. However, the higher upfront cost and slightly heavier weight may be drawbacks for budget-conscious or high-performance users.

For most **recreational and utility boats** running at moderate speeds, this propeller offers a **strong balance of performance, longevity, and ease of maintenance**. If your primary concerns are **durability and low maintenance**, this is a highly recommended option. If you prioritize **lightweight, noise reduction, or high-speed performance**, you may want to consider alternatives like aluminum or composite propellers with finer pitches.

- You operate in **saltwater or harsh conditions** where corrosion resistance is critical.

- Your boat is **moderately powered** (e.g., 100 250 HP Yamaha outboard) and used for **fishing, cruising, or light towing**.

- You value **long-term durability and minimal maintenance**.

- You want a **proven, widely available** propeller with strong industry support.

- You need **higher speed performance** (opt for a finer pitch, e.g., 12x17).

- Your budget is tight (aluminum propellers may be a cost-effective compromise).

- You prioritize **reduced noise or weight** (some composite propellers offer these benefits).

- Your boat operates in **extremely shallow or rocky waters** where debris damage is a frequent concern.

Details:

Recently re powered my boat with a Yamaha F70LA 4 stroke. Please see pictures, hub is good and showed no issues when used, 2 weeks ago. This prop came with engine and has too much pitch for my boat 4900 rpm at 32mph light load is in very good condition some pitting surface rust. Stainless steel propeller 13x17 fits Yamaha with 4.25 gearcase.

part #: 13x17k2 prices

• $135.00-$216.00

specifications propboapar:

• for makes: Yamaha
• mpn: 13x17-k2
• part type: Propeller
• propeller rotation: Standard

returns propboapar:

• policy: No Returns

general propboapar:

• condition: Used
• Parts Accessories > Boat Parts > Propellers

offer propboapar:

• best offers: True
• quantity: 1
• started: May 11, 2026
• options: Ship-to-home
• availability: In Stock
• sold: 0

seller propboapar:

• rating: 100.0%
• # reviews: 1728
• city: Middleburg, Florida

shipping propboapar:

• service: FedEx Ground / FedEx Home Delivery
• cost: $28.73
• class: Standard
• transit: 3-9 Days
• type: Calculated
• carrier: FedEx

payments propboapar:

• other
• credit card: Visa
• wallet: Apple-pay

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