MERCURY 398-735 Wizard Antique Outboard Motor Flywheel Phelon KG4 MK15 1950S

( Manufacturer Part Number: 398-735 ), ( Part Type: Motor Flywheel ), ( Country Of Origin: United States )

Review MERCURY Wizard Antique Outboard Motor Flywheel Phelon Kg4 1950s

The **Mercury 398-735 Wizard Antique Outboard Motor Flywheel (Phelon KG4 MK15, 1950s)** is a meticulously preserved piece of marine engineering history, embodying the golden era of small-boat propulsion when innovation and craftsmanship defined the industry. This rare flywheel, originally paired with a **Mercury 398-735 Wizard** a legendary outboard motor from the late 1940s and early 1950s serves as both a functional component and a tangible artifact of an era when boating was a thrilling adventure for enthusiasts. The **Phelon KG4 MK15** designation indicates its compatibility with the **Mercury 398-735**, a model renowned for its lightweight yet powerful performance, designed to propel small to mid-sized boats with surprising efficiency for its time. Crafted with precision, this flywheel features a robust, cast-iron construction, characteristic of mid-century marine engineering, where durability and reliability were paramount. Its design reflects the mechanical ingenuity of the period, with intricate machining and balanced weight distribution to ensure smooth operation, even under demanding conditions. The **1950s-era** origins of this part make it a sought-after collectible for vintage boat restorers, historians, and enthusiasts who appreciate the raw mechanical beauty of an age before modern plastics and mass production dominated the industry. Whether used in a restoration project or displayed as a piece of automotive history, this flywheel embodies the spirit of innovation and the unmistakable charm of a bygone era when every engine component was built to last. Its presence in a collection or on a restored vessel instantly transports one back to a time when boating was as much about the thrill of the open water as it was about the engineering marvels that made it possible.

### **Pros and Cons of Buying a Mercury 398-735 Wizard Antique Outboard Motor (Flywheel Phelon KG4 MK15, 1950s)**

#### **Pros**

1. **Historical and Collectible Value** This is a rare, vintage Mercury outboard from the 1950s, making it a sought-after piece for enthusiasts and collectors. Its age and originality could appreciate over time, especially if well-preserved.

2. **Unique Design and Craftsmanship** The 1950s Mercury outboards were built with solid metal construction and mechanical simplicity, reflecting the engineering standards of the era. The flywheel Phelon KG4 and MK15 designation suggest it may have been a high-end model with distinctive features.

3. **Potential for Restoration and Customization** If you enjoy mechanical work, restoring this engine could be a rewarding project. Parts may be available through specialty suppliers, and modifications (such as upgrading fuel systems or electrical components) could improve performance.

4. **Nostalgia and Aesthetic Appeal** For those who appreciate classic boating history, running this motor even in a restored condition would provide a sense of connection to early outboard technology. It could also serve as a conversation piece or display piece.

5. **Lower Operating Costs (If Well-Maintained)** Vintage outboards often have simpler designs than modern counterparts, which can mean fewer electronic failures. If the motor is in good condition, fuel efficiency may not be a major concern compared to modern high-performance engines.

6. **Potential for Off-Grid or Experimental Use** Some enthusiasts use vintage engines for small boats, trolling, or even as backup power sources. Its size (398-735 cubic inches suggests a mid-sized model) could make it suitable for smaller vessels.

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#### **Cons**

1. **High Maintenance and Reliability Risks** Engines from the 1950s were not built with modern durability in mind. Rust, worn bearings, and outdated materials (such as leaded fuel compatibility issues) could require frequent repairs. Without proper maintenance, the motor may fail unexpectedly.

2. **Difficulty Finding Parts and Specialists** Locating genuine replacement parts for a 1950s Mercury outboard can be challenging. While some suppliers stock vintage marine parts, others may require custom fabrication or sourcing from obsolete inventories. Finding a mechanic experienced with this specific model could also be difficult.

3. **Fuel and Emissions Compliance** Modern fuel standards (e.g., ethanol blends, sulfur restrictions) may not align with the original engine s design. Running it on modern fuel could lead to corrosion, clogged carburetors, or poor performance. Retrofitting emissions systems (if required by local laws) may not be feasible.

4. **Performance Limitations** Compared to modern outboards, this engine will lack power, efficiency, and refinement. It may struggle with larger boats, high loads, or extended runtime without overheating or stalling. Tachometers, fuel injection, and other modern conveniences are absent.

5. **Safety Concerns** Older outboards often lack modern safety features such as kill switches, remote controls, or integrated bilge pumps. Operating it could require additional precautions, such as manual cutoff procedures or manual bilge pumping.

6. **Resale Value Uncertainty** While some vintage engines appreciate, others depreciate quickly due to wear or lack of demand. If you plan to sell later, the market for this specific model may be limited to a niche audience.

7. **Legal and Insurance Challenges** Some jurisdictions have restrictions on vintage engines, particularly if they don t meet current safety or emissions standards. Insurance for a restored classic outboard may be difficult or expensive to obtain.

8. **Time and Labor Investment** Restoring this motor to running condition will likely require significant time, effort, and mechanical skill. If you re not experienced with marine engines, the project could become costly or frustrating.

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### **Conclusion**

Buying a Mercury 398-735 Wizard antique outboard from the 1950s is a decision that hinges on whether you prioritize **collectibility, nostalgia, or mechanical challenge** over practicality and reliability. It is not a practical choice for daily use on larger boats or for those seeking low-maintenance performance. However, if you are a dedicated restorer, a boating historian, or simply enjoy the thrill of working with vintage machinery, this motor could be an exciting and rewarding project.

For most modern boaters, a restored vintage outboard is best suited as a **display piece, a small trolling engine, or a hobbyist s passion project** not as a primary propulsion system. If you proceed, budget for extensive repairs, source parts carefully, and be prepared for the possibility that the motor may never run perfectly or reliably.

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### **Recommendation**

- **Buy if:** You are a skilled mechanic with access to vintage marine parts, you have a deep appreciation for classic engines, and you re willing to invest time and money into restoration. Consider using it for a small, historic boat or as a static display.

- **Avoid if:** You need a reliable, high-performance engine for regular use, lack mechanical experience, or cannot commit to the maintenance required to keep it running.

- **Alternative Considerations:** If you want a vintage outboard experience without the extreme challenges, look for a **restored 1960s 1980s Mercury or Evinrude model** that is more common and easier to maintain. For modern practicality, a well-used but serviceable contemporary outboard would be a far more practical choice.

Ultimately, this purchase should be made with clear expectations treating it as a **project rather than a functional asset** will set you up for a more enjoyable experience.

Details:

I will always combine shipping.

part #: 398735 prices

• $24.95-$79.95

specifications ouboaen:

• for makes: Mercury
• mpn: 398-735
• part type: Motor Flywheel
• country of origin: United States

general ouboaen:

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

shipping ouboaen:

• transit: 4-8 Days
• service: USPS Priority Mail Padded Flat Rate Envelope
• carrier: USPS
• type: Fixed
• class: Expedited
• cost: $14.00

seller ouboaen:

• rating: 100.0%
• city: Altadena, California
• # reviews: 6488

payments ouboaen:

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

returns ouboaen:

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

offer ouboaen:

• options: Ship-to-home
• availability: In Stock
• sold: 0
• quantity: 1
• started: May 10, 2026

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