MARINER 43290A Outboard Plate Megaphone 99699 90HP 6-CYL

( Brand: Mariner ), ( Manufacturer Part Number: 43290A ), ( Part Type: Plate ), ( Country Of Origin: United States )

Review MARINER 90hp 6-cyl Outboard Plate And Megaphone fits E11 1984

The **Mariner 43290A 99699 1984 90 Horsepower Six-Cylinder Outboard Motor** is a legendary piece of marine engineering, embodying the robust, dependable power that defined a generation of boating. Originally manufactured in the early 1980s, this outboard exemplifies the classic design and performance of the era, blending raw mechanical strength with the precision of its time. With a **90 horsepower** output, this six-cylinder, two-stroke engine delivers a smooth yet powerful thrust, making it ideal for mid-sized boats ranging from fishing vessels to cruisers and even small powerboats. The **99699** model designation suggests a specific variant within the Mariner lineup, likely optimized for reliability and ease of maintenance, a hallmark of Mariner s reputation for durability.

The **1984 model year** places this outboard in a transitional period where marine technology was evolving, yet the fundamental design remained rooted in proven engineering. The **E11** designation refers to the engine s electrical system, indicating compatibility with standard marine electrical components of the era, though modern upgrades may be necessary for contemporary use. This outboard features a **direct-drive, single-reduction gear system**, ensuring efficient power transfer with minimal loss, while its **cast-aluminum cowling** provides both protection and a sleek aesthetic. The **four-stroke starter** and **manual choke** controls reflect the mechanical simplicity of the time, offering a hands-on boating experience that appeals to enthusiasts who appreciate vintage machinery.

Under the hood, the **6-cylinder, two-stroke design** (likely a version of the iconic Mariner 6-cylinder engine) produces a deep, resonant growl that is both satisfying and iconic. The **fuel-injected or carbureted** intake system (depending on exact configuration) ensures consistent power delivery, while the **wet sump lubrication** system keeps the engine cool and protected during extended runs. The **direct-drive propeller shaft** and **single-reduction gearing** contribute to a balanced power-to-weight ratio, making it well-suited for both leisurely cruising and more demanding tasks like towing or fishing.

For collectors and restorers, this Mariner outboard is a prized find, offering a blend of nostalgia and functional performance. While modern outboards have advanced in efficiency and emissions compliance, the **90HP Mariner 6-cylinder** remains a symbol of classic marine power reliable, robust, and built to last. Whether used in a restored classic boat or as a centerpiece for a mechanical enthusiast s collection, this outboard carries the legacy of a bygone era of boating, where simplicity and strength were the defining qualities of marine propulsion. Proper maintenance and restoration can breathe new life into this relic, ensuring it continues to turn heads and power adventures for years to come.

### **Pros and Cons of buying a 1984 Mercury 4.3L (43290A) 90HP 6-Cylinder Outboard (Plate: E11, Megaphone E11)**

1. **Classic Reliability** Mercury 4.3L engines from the early 1980s are well-known for their durability, especially when properly maintained. Many still run strong after decades with regular upkeep.

2. **Proven Performance** The 90HP output is sufficient for moderate-sized boats (18 25 feet) in calm to moderate conditions. It provides adequate power for cruising, fishing, and light planing.

3. **Mechanical Simplicity** Compared to modern fuel-injected outboards, carbureted engines like this one are easier to service and repair, with fewer high-tech components that can fail.

4. **Affordability** Used 1984 models are relatively inexpensive, making them a budget-friendly option for those who want a boat without investing in a brand-new engine.

5. **Parts Availability** Mercury 4.3L engines are still supported by aftermarket parts suppliers, though some components may require sourcing from specialty dealers.

6. **Good for Small Boats** If paired with a suitable hull (e.g., a 19 22 ft. center console or cruiser), it can handle fishing, weekend cruising, or even light offshore trips in fair weather.

7. **No Modern Complexity** No electronic fuel injection, no advanced diagnostics, and fewer failure points compared to newer outboards.

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1. **Age and Wear** At nearly 40 years old, the engine has likely accumulated significant hours. Rust, worn bearings, and internal corrosion are common issues that may require major repairs.

2. **Fuel System Issues** Carbureted engines are prone to clogged jets, leaking gaskets, and fuel line deterioration. Modern fuel additives may not be compatible, and ethanol blends can damage older rubber components.

3. **Emissions and Regulations** Many marinas and states have phased out older two-stroke and carbureted engines due to pollution concerns. You may face restrictions on where you can run it or require modifications to meet emissions standards.

4. **Maintenance Requirements** Regular overhauls (valves, pistons, bearings) are often necessary. Many owners underestimate the cost of keeping an old engine running reliably.

5. **Fuel Efficiency** Two-stroke outboards (if this is one) are notoriously inefficient, consuming fuel at a much higher rate than modern four-stroke engines.

6. **Resale Value** Even in good condition, a 1984 Mercury will depreciate quickly compared to newer models. If you plan to sell later, the market is limited.

7. **Noise and Vibration** Older outboards tend to be louder and rougher-running than modern engines, which can be uncomfortable for long trips.

8. **Lack of Modern Features** No trim control, no electric start (likely manual or kick-start), and no integrated navigation or diagnostics.

9. **Environmental Concerns** Many marinas and boating areas now ban older two-stroke engines due to oil pollution. You may need to modify it to a four-stroke or face restrictions.

- **Rust in the lower unit** (common in saltwater exposure)

- **Worn prop shaft or bearings**

- **Leaking impellers or seals**

- **Corroded electrical components**

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- Have mechanical skills or access to a trusted mechanic for maintenance.

- Plan to use it sparingly in fresh or lightly saltwater conditions.

- Are okay with potential emissions restrictions and lack of modern conveniences.

- Find a well-documented engine with recent overhauls.

However, if you prioritize **reliability, fuel efficiency, and environmental compliance**, a newer outboard (even a used one from the 2000s or later) would be a far better long-term investment. Older engines require **significant time, money, and effort** to keep running smoothly, and the risks of unexpected failures increase with age.

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- **If you re buying for a project boat or occasional use** and can handle maintenance, this engine *could* work but expect to spend **$1,500 $3,000 ** on repairs within the first year if it s been neglected.

- **If you want a dependable, low-maintenance outboard**, consider a **used Mercury 4.3L four-stroke (if available) or a newer 50 90HP outboard** (e.g., Yamaha, Mercury Verado, or Evinrude E-TEC). These will be more expensive upfront but far more reliable and compliant with modern boating regulations.

- Lower unit for rust and wear.

- Propeller and shaft for damage.

- Fuel system for leaks or clogs.

- Electrical components for corrosion.

**Final Verdict:** Unless you re a die-hard enthusiast or have a specific need for this exact engine, a newer or better-maintained outboard is the smarter choice. If you proceed, budget for **major repairs** and be prepared for potential restrictions on where you can run it.

Details:

They will however be in functioning and usable condition. Just because the part looks right does not mean that Otis. Mariner Gray. Parts off of a 1984 Mariner 90hp inline 6-cylinder Tower Power, 2-stroke, freshwater outboard motor, model 7090624, serial 6436752, long shaft for 20 transoms, motor had low compression.

Recombine shipping on multiple items. Pleasured entire listing before buying or purchasing item. Keeping mind that if the listing is for a used part, it used part, so there may be some minor cosmetic damage scratches/scuffs. We operate in Central Standard Time.

part #: 43290a prices

• $54.54-$66.50

specifications ouboaen:

• for models: E11
• for years: 1984
• brand: Mariner
• mpn: 43290a
• part type: Plate
• country of origin: United States

shipping ouboaen:

• transit: 2-5 Days
• class: Standard
• cost: $0.00
• service: Standard
• type: Fixed

general ouboaen:

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

payments ouboaen:

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

returns ouboaen:

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

seller ouboaen:

• # reviews: 6366
• rating: 99.9%
• city: Melrose, Minnesota

offer ouboaen:

• sold: 0
• options: Ship-to-home
• availability: In Stock
• started: May 28, 2026
• quantity: 1

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