1. Boat Outboard Engines To Buy
  2. sku: 24344338430969604
  3. MERCURY 354134

MERCURY 354134 Flywheel Cover Plate 807259A2 805580A1

fits make: Mercury.

805580a1 Mercury 354134 807259a2 New Flywheel Cover Plate Assembly

( Manufacturer Part Number: 354134 ), ( Part Type: Cover Flywheel Plate )

Review MERCURY New Flywheel Cover Plate Assembly

The **Mercury 354134 Flywheel Cover Plate** is a precision-engineered component designed specifically for select Mercury outboard motors, ensuring optimal performance, durability, and reliability in marine applications. Crafted from high-quality, corrosion-resistant materials, this cover plate is engineered to fit seamlessly over the flywheel assembly, providing both structural integrity and protection against environmental elements such as saltwater, moisture, and debris. Its robust construction helps maintain the internal alignment of the flywheel and associated components, reducing wear and tear while minimizing the risk of mechanical failure over extended use.

This flywheel cover plate is meticulously designed to complement the intricate mechanics of Mercury s outboard motor systems, particularly those featuring the **807259A2** and **805580A1** model variants. The plate features precise cutouts and mounting points that align perfectly with the motor s flywheel housing, ensuring a secure and snug fit without compromising functionality. Its smooth, contoured surface not only enhances aerodynamics but also simplifies installation and removal during routine maintenance or repairs. The material composition likely a blend of reinforced polymers or treated metals resists warping, cracking, or degradation, even under the stress of repeated thermal cycles and exposure to harsh marine conditions.

Beyond its functional benefits, the **Mercury 354134 Flywheel Cover Plate** contributes to the overall efficiency of the outboard motor by helping to maintain proper airflow and cooling within the engine compartment. By shielding critical components from external contaminants, it extends the lifespan of the flywheel and associated parts, reducing the frequency of costly replacements or overhauls. Whether installed on a recreational boat, fishing vessel, or performance craft, this component is a testament to Mercury s commitment to engineering reliability into every part of their marine propulsion systems. For boat owners seeking to preserve the performance and longevity of their Mercury outboard, this flywheel cover plate is an essential, high-quality replacement part that delivers both form and function.

### Pros and Cons of buying a Mercury 354134 Flywheel Cover Plate (Part Numbers: 807259A2, 805580A1)

#### **Pros:**

1. **Compatibility** This flywheel cover plate is designed specifically for Mercury outboard motors, ensuring a proper fit for models that require these part numbers. It is likely to be compatible with engines like the 200, 250, or 300 HP series, depending on the exact model year and configuration.

2. **Durability** Mercury outboard parts are generally built to withstand the demands of marine environments, including exposure to saltwater, vibration, and temperature fluctuations. A well-made cover plate should resist warping, cracking, or loosening over time.

3. **Ease of Installation** Since it is an OEM (Original Equipment Manufacturer) or high-quality aftermarket part, it should fit securely with the existing mounting hardware, reducing the risk of improper installation that could lead to leaks or damage.

4. **Reliability** Mercury is a well-known brand with a reputation for quality and longevity. Using genuine or authorized aftermarket parts can help maintain the performance and reliability of your engine.

5. **Warranty Coverage** If purchased from an authorized dealer or through Mercury s official channels, the part may come with a warranty, providing peace of mind against defects.

6. **Prevents Contamination** A properly sealed flywheel cover helps keep debris, water, and moisture out of the internal components, reducing wear and tear on the engine s internals.

7. **Aesthetic Consistency** Replacing a damaged or missing cover plate with an authentic part ensures the engine s appearance remains consistent with the original design.

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#### **Cons:**

1. **Cost** Mercury parts, especially OEM or high-quality aftermarket options, can be more expensive than generic or third-party alternatives. This may be a significant investment if the part is needed urgently.

2. **Limited Availability** Depending on the region, finding this specific part number may require ordering from an authorized dealer, which could involve shipping delays or higher costs.

3. **Potential for Counterfeit Parts** Purchasing from unapproved sellers increases the risk of receiving a counterfeit or low-quality replica, which could fail prematurely or not fit correctly.

4. **Installation Complexity** While the part itself is straightforward, removing the old cover plate may require disassembling parts of the engine, which could be challenging for inexperienced DIYers. Professional installation may be necessary, adding to the cost.

5. **Compatibility Confusion** The part numbers (807259A2 and 805580A1) may apply to multiple engine models or years, so verifying exact compatibility with your specific Mercury outboard is crucial to avoid purchasing the wrong part.

6. **Maintenance Overhead** If the cover plate is part of a larger issue (e.g., a damaged flywheel or worn seals), replacing just the cover may not fully resolve the problem, requiring additional repairs.

7. **Environmental Factors** Even with a high-quality cover, prolonged exposure to saltwater, UV rays, and constant vibration can eventually degrade the material, necessitating future replacements.

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### **Conclusion:**

The Mercury 354134 flywheel cover plate (part numbers 807259A2 and 805580A1) is a reliable and necessary component for maintaining the integrity and performance of your Mercury outboard motor. Its primary advantages lie in its compatibility, durability, and brand reputation, which justify the cost for most boat owners. However, the potential drawbacks such as higher upfront expenses, installation challenges, and the risk of counterfeit parts must be carefully considered.

If your engine requires this part to prevent leaks, contamination, or further damage, investing in an authentic or high-quality aftermarket version is strongly recommended. Always cross-reference the part numbers with your exact engine model and year to ensure compatibility, and consider professional installation if you lack mechanical experience.

**Final Recommendation:**

Purchase the part from an **authorized Mercury dealer or a trusted marine parts supplier** to ensure authenticity and warranty coverage. If budget is a concern, compare prices from multiple sources while prioritizing quality over cost-cutting measures. For installation, follow the manufacturer s guidelines or seek assistance from a marine mechanic to avoid mistakes that could compromise engine performance. Regularly inspect the cover plate and surrounding components to address any signs of wear or damage promptly.

Details:

Part Number: 807259A2, 805580A1. Related Part Numbers: 805580A1. MPN: 807259A2. Brand: Mercury.

Condition: Used. That you see pictured.

part #: 354134 price

  • $45.00

specifications ouboaen:

  • for makes: Mercury
  • mpn: 354134
  • part type: Cover Flywheel Plate

payments ouboaen:

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

general ouboaen:

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

offer ouboaen:

  • sold: 0
  • quantity: 1
  • availability: In Stock
  • best offers: True
  • started: June 2, 2026
  • options: Ship-to-home

seller ouboaen:

  • # reviews: 30300
  • rating: 99.9%
  • city: Green Bay, Wisconsin

shipping ouboaen:

  • service: USPS Ground Advantage, USPS Priority Mail, UPS Ground, UPS Next Day Air Saver
  • class: Standard, Expedited, One-day
  • cost: $32.80
  • type: Calculated
  • transit: 3-7 Days
  • carrier: USPS, UPS

returns ouboaen:

  • policy: No Returns
for makes: mercury, part type: cover flywheel plate,
category: boat parts > outboard engines components > powerhead components, sku: 24344338430969604,
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1 offer $45.00 USD
  • Used. Offer #1 priced at $45.00 + $32.80 shipping estimate = $77.80* total. that you see pictured. Part Number: , .+$32.80 shipping

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