OMC 321513 Omcjohnson Water Tube 35

( Brand: Omc ), ( Manufacturer Part Number: 321513 ), ( Part Type: Hp Tube Guide ), ( Country Of Origin: United States )

Review OMC Genuine Omcjohnson Evinrude Hp And 35 Water Tube Guide Years fits 1976-84–2025

The **OMC 321513 (OMC/Johnson Evinrude 25 HP 35" Water Tube, 1976 1984)** is a classic, high-performance outboard motor that embodies the rugged reliability and timeless engineering of the mid-1970s to early 1980s marine industry. Part of the legendary **Evinrude Marine** line, this **25 horsepower, three-cylinder, two-stroke water-cooled outboard** was designed for both recreational boating and light-duty fishing applications, offering a perfect balance of power, simplicity, and durability. With its **35-inch water tube** a hallmark of the era s compact yet efficient cooling systems this motor was engineered to handle everything from small runabouts and bass boats to utility vessels, delivering smooth acceleration and consistent performance even in demanding conditions. The **cast-aluminum cowling** and **chrome-plated trim tabs** not only enhance its classic aesthetic but also contribute to its robust construction, ensuring resistance against corrosion and wear over time. Under the hood, the **air-cooled, horizontally opposed three-cylinder engine** (with a displacement of approximately **25 cubic inches**) produces a crisp, throaty growl that s as satisfying to hear as it is effective in propelling a boat forward. The **direct-drive transmission** and **single-lever shift mechanism** provide intuitive control, while the **manual choke and pull-start system** reflect the motor s straightforward, no-nonsense operation ideal for anglers and weekend warriors who value simplicity without sacrificing power. Whether used on a vintage fishing skiff, a classic speedboat, or a restored classic boat, this **Evinrude 25 HP** stands as a testament to the golden age of outboard motors, offering a blend of nostalgia, functionality, and the kind of dependable performance that keeps it running strong even after decades of use. For collectors, restorers, and enthusiasts seeking a motor that combines historical significance with practical utility, the **OMC 321513** remains a sought-after piece of marine history.

### **Pros and Cons of Buying a 1976-1984 OMC 321513 (OMC/Johnson Evinrude 25 HP 35 Water Tube)**

#### **Pros**

1. **Classic Reliability** The 25 HP Evinrude two-stroke engines from this era were known for their durability and straightforward mechanical design. Many were built to last with proper maintenance, making them a solid choice for casual boating.

2. **Affordability** These older outboards are significantly cheaper than modern alternatives, making them an attractive option for budget-conscious buyers. Parts and labor costs are also lower compared to newer, more complex engines.

3. **Simple Maintenance** Two-stroke engines from this period are easier to service than modern four-strokes. Basic repairs (like spark plug changes, carburetor adjustments, or fuel system cleaning) can often be done with basic tools.

4. **Vintage Appeal** If you enjoy the classic look and feel of older outboards, this engine offers a nostalgic boating experience. It can be a great fit for small boats, canoes, or fishing setups where power isn t the primary concern.

5. **Availability of Parts** While some specialized parts may be harder to find, many common components (like gaskets, seals, and basic hardware) are still available through marine supply stores or online marketplaces.

6. **Lower Fuel Consumption** Two-stroke engines, especially older ones, tend to burn fuel more efficiently in terms of raw power output compared to modern high-performance engines.

7. **Good for Light-Duty Use** If you plan to use the boat primarily for calm waters, fishing, or leisurely cruising, this engine can handle the workload without excessive wear.

#### **Cons**

1. **Environmental Concerns** Two-stroke engines release unburned oil and fuel into the water, contributing to pollution. While modern two-strokes have improved, older models like this one are far less eco-friendly than modern alternatives.

2. **Higher Maintenance Needs** Two-stroke engines require regular oil mixing (if not pre-mixed), carburetor cleaning, and more frequent tune-ups than modern four-strokes. Neglect can lead to rapid wear and failure.

3. **Reliability Issues Over Time** Engines from this era may have worn-out internals (like pistons, rings, or crankshafts) that could fail unexpectedly, especially if the engine hasn t been well-maintained.

4. **Limited Power for Modern Use** At 25 HP, this engine is underpowered for most modern recreational boats, especially if you plan to tow a trailer or handle rougher conditions. It may struggle with waves or higher speeds.

5. **Noise and Vibration** Older two-strokes are louder and vibrate more than modern engines, which can be uncomfortable for extended use.

6. **Difficulty Finding Skilled Mechanics** While basic repairs are manageable, complex issues (like engine rebuilds) may require specialized knowledge, and finding a mechanic familiar with these older models can be challenging.

7. **Potential for Hidden Damage** Without a thorough inspection, you may inherit an engine with internal corrosion, seized components, or other issues that could lead to costly repairs.

8. **Regulatory Restrictions** Some marinas or lakes have restrictions on two-stroke engines due to pollution concerns, so check local regulations before purchasing.

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### **Conclusion**

The **1976-1984 OMC 321513 25 HP Evinrude** is a solid choice if you prioritize **affordability, simplicity, and a vintage boating experience** while accepting the trade-offs of a two-stroke engine. It works well for **light-duty, low-speed use** in calm waters, especially if you re willing to invest time in maintenance.

However, if you plan to use the boat **frequently, in rough conditions, or for extended trips**, a **modern outboard (preferably a four-stroke)** would be a far more reliable and environmentally friendly option. The 25 HP rating is also **underpowered for most modern boats**, so unless you have a very small vessel, you may need to upgrade soon.

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### **Recommendation**

- You re on a tight budget and need a **budget-friendly, low-maintenance engine** for occasional use.

- You enjoy **vintage boating** and don t mind the extra upkeep.

- The boat is **small (under 12-14 feet)** and used primarily for **fishing, canoeing, or calm-water cruising**.

- You re prepared to **regularly service the engine** (oil mixing, carburetor cleaning, etc.).

- You want **modern reliability, lower emissions, and easier maintenance**.

- The boat will be used **frequently, in rough water, or for towing**.

- You re not comfortable with **higher maintenance demands** or potential repair costs.

- You plan to keep the boat long-term, as upgrading to a newer engine may be necessary sooner rather than later.

- If you like the idea of a **small, reliable engine**, consider a **used four-stroke outboard** (e.g., Yamaha 25-30 HP, Mercury 25-30 HP) for better fuel efficiency and lower emissions.

- If you re set on a two-stroke, look for **later-model Evinrude 25 HP (1985 )** with **water-cooled improvements** or **modern two-strokes** (like the E-TEC series) if you want a balance between nostalgia and reliability.

Ultimately, this engine is best suited for **casual, low-demand boating** where cost and simplicity outweigh modern conveniences. For anything more serious, a newer engine would be the wiser long-term investment.

Details:

GENUINE OMC WATER TUBE FITS, 25 35 HP 1976-1984 FITS.

part #: 321513 prices

• $39.95-$48.00

specifications ouboaen:

• for makes: Evinrude, Omc
• for years: 1976-84-2025
• brand: Omc
• mpn: 321513
• part type: Hp Tube Guide
• country of origin: United States

returns ouboaen:

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

seller ouboaen:

• city: Versailles, Indiana
• # reviews: 1181
• rating: 100.0%

general ouboaen:

• Boat Parts > Outboard Engines Components > Cooling Systems
• condition: New

shipping ouboaen:

• type: Calculated
• service: USPS Ground Advantage
• cost: $5.20
• transit: 5-10 Days
• carrier: USPS
• class: Standard

payments ouboaen:

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

offer ouboaen:

• sold: 0
• quantity: 1
• options: Ship-to-home
• availability: In Stock
• started: February 13, 2026

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