HARLEY-DAVIDSON 631-26 Generator Timer Drive Gear Electric Magneto P658

( Brand: Harley-davidson ), ( Manufacturer Part Number: 631-26 ), ( Compatible Make: For Harley-davidson ), ( Oe/oem Part Number: 632-18 ), ( Compatible Model: Servi-car ), ( Vintage Part: Yes ), ( Country Of Origin: United States )

Review HARLEY DAVIDSON Oe Generator Timer Drive Gear Jd Electric Magneto fits 1926–1929

The **Harley-Davidson 631-26 Generator Timer Drive Gear (JD Electric Magneto P658)** is a meticulously crafted, early 20th-century component that embodies the engineering precision and mechanical ingenuity of Harley-Davidson s formative years. Originally designed for use on the iconic **1926 1929 Harley-Davidson models**, this gear serves as a critical part of the **JD Electric Magneto system**, which was pivotal in converting the mechanical energy of the engine into electrical sparks to ignite the combustion chambers. Crafted from high-quality, durable steel, this drive gear is forged to exacting specifications, ensuring smooth and reliable operation within the engine s timing mechanism. Its unique **631-26 designation** indicates a specialized fitment for Harley-Davidson s **631cc V-twin engines**, which were among the most advanced and sought-after motorcycles of their era. The gear s precise tooth profile and robust construction allow it to maintain consistent timing with the camshaft, synchronizing the ignition system to deliver optimal power and efficiency. This component is not merely a functional part but a tangible piece of automotive history, reflecting the evolution of motorcycle engineering during the golden age of American motorcycle manufacturing. Whether restored for a vintage ride or preserved as a collector s item, this **P658 magneto drive gear** represents a rare and authentic element of Harley-Davidson s early electric ignition systems, making it a prized find for enthusiasts and restorers alike.

The **Harley-Davidson 631-26 (1926 1929) Generator-Timer Drive Gear, J.D. Electric Magneto (P658)** is a highly sought-after vintage motorcycle component, particularly for restorers and collectors. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **Historical Significance and Rarity**

The 1926 1929 Harley-Davidson models, especially those with the J.D. Electric magneto system, are among the earliest examples of Harley-Davidson s transition from simple magneto ignition to more refined electrical systems. This gear and magneto are part of a rare and well-documented era in motorcycle history, making them desirable for collectors and enthusiasts who appreciate mechanical heritage.

2. **Functional and Restorable**

The generator-timer drive gear and magneto are critical components for restoring early Harley-Davidsons to running condition. They are designed to work with the original engine and ignition systems, ensuring authenticity in a restored bike. Many modern replacements lack the same level of historical accuracy, making original or period-correct parts highly valuable.

3. **Compatibility with Classic Models**

These parts are specifically designed for Harley-Davidson models from the late 1920s, including the **631-26** (a 631cc single-cylinder model). They fit seamlessly into the original engine layout, which is a major advantage for purists who prioritize mechanical integrity over modern convenience.

4. **Mechanical Robustness**

Early Harley-Davidson components, including the J.D. Electric magneto and generator-timer drive gear, were built to last with proper maintenance. The materials and construction standards of the era were robust, and many of these parts can be refurbished to near-new condition with the right expertise.

5. **Investment Potential**

Vintage Harley-Davidson parts, especially those from the 1920s, tend to appreciate in value over time. As interest in classic motorcycles grows, well-preserved or restored components like these can become valuable assets, either for personal use or resale.

6. **Community and Restoration Appeal**

Owning or restoring a bike with original or period-correct parts like this magneto and gear attracts attention from vintage motorcycle communities. Enthusiasts often seek out authentic components to enhance the historical accuracy of their projects, making these parts highly desirable in restoration circles.

7. **Educational Value**

For those interested in the evolution of motorcycle engineering, studying and working with these components provides insight into early ignition systems, generator technology, and mechanical design. This can be both a learning experience and a source of pride for mechanics and historians.

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### **Cons**

1. **High Cost**

Due to their rarity and historical value, these parts can be expensive, often costing hundreds or even thousands of dollars depending on condition and demand. For budget-conscious restorers, this may be a significant barrier to entry.

2. **Limited Availability**

Finding a matching set in good condition can be challenging. Many of these parts are no longer in production, and sourcing them may require searching through private sellers, auctions, or specialized vintage motorcycle parts dealers. This can extend the restoration timeline and increase costs if multiple attempts are needed.

3. **Maintenance and Repair Challenges**

Early Harley-Davidson components, while robust, often require specialized knowledge to maintain or repair. The J.D. Electric magneto, for example, may need adjustments or replacements of internal parts that are no longer easily accessible. Restorers may need to consult vintage motorcycle experts or seek out rare tools to keep these components running smoothly.

4. **Compatibility with Modern Modifications**

If the restored bike incorporates modern components (e.g., modern ignition systems, electric starters, or fuel injection), the original generator-timer drive gear and magneto may become redundant or incompatible. This could limit the bike s usability or require additional modifications to integrate these parts seamlessly.

5. **Risk of Damage or Wear**

Parts from this era may have been exposed to decades of use, rust, or neglect. Even if purchased in good condition, they may require extensive cleaning, machining, or refurbishment to function correctly. The risk of discovering hidden damage after purchase can add unexpected costs and delays to a restoration project.

6. **Legal and Insurance Considerations**

Restoring or modifying a vintage motorcycle with original parts may have legal implications depending on local regulations regarding historical vehicles. Additionally, insuring a restored classic bike with rare components can be more complex and costly than insuring a modern motorcycle.

7. **Time-Consuming Restoration**

Restoring a bike with these components often requires patience and dedication. The process may involve sourcing additional parts, consulting manuals from the 1920s, and performing labor-intensive tasks like machining, polishing, or rewiring. This can be a significant time investment for hobbyists with limited experience in vintage motorcycle restoration.

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### **Conclusion**

The **Harley-Davidson 631-26 (1926 1929) Generator-Timer Drive Gear and J.D. Electric Magneto (P658)** are exceptional components for enthusiasts who prioritize historical authenticity, mechanical integrity, and the challenge of restoring a piece of motorcycle history. Their rarity, functional value, and investment potential make them highly desirable, but their high cost, limited availability, and maintenance challenges can be significant drawbacks.

For someone with the budget, time, and passion for vintage motorcycles, these parts are an excellent choice. However, they are not ideal for casual riders or those seeking a quick, modern restoration. The key to success lies in thorough research, patience, and access to expertise in early Harley-Davidson mechanics.

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### **Recommendation**

If you are restoring a Harley-Davidson from the 1920s and prioritize historical accuracy, these parts are a worthwhile investment. Focus on sourcing them from reputable sellers with provenance (e.g., auction houses, vintage motorcycle dealers, or trusted private collectors). Budget for additional costs like refurbishment, testing, and potential replacements for worn components.

If cost is a major concern, consider alternatives such as period-correct replicas or modern equivalents that mimic the function of the original parts. While these may not offer the same historical value, they can achieve a similar aesthetic and functional result at a lower cost.

If your goal is to blend vintage charm with modern convenience (e.g., electric start, fuel injection), weigh the practicality of retaining these components. In some cases, they may add unnecessary complexity or cost without significantly enhancing the bike s value or usability.

Tackling a restoration with these parts is best suited for those with prior experience in motorcycle mechanics or a strong willingness to learn. Consult vintage Harley-Davidson forums, manuals, and experts to avoid common pitfalls and ensure the project remains feasible.

Ultimately, the decision to pursue these components should align with your goals, resources, and passion for vintage motorcycles. If you are committed to preserving the spirit of early Harley-Davidson engineering, they are a rewarding and valuable addition to your project.

Details:

For Sale is: A OEM 1926-1929 18 teeth Electric model's #631-26.

part #: 63126 prices

• $42.00-$79.00

specifications cyclevintagee:

• for makes: Harley
• for years: 1926-1929
• brand: Harley-davidson
• mpn: 631-26
• compatible make: For Harley-davidson
• oe/oem part number: 632-18
• compatible model: Servi-car
• vintage part: Yes
• country of origin: United States

general cyclevintagee:

• Parts Accessories > Motorcycle Scooter Parts Accessories > Other Motorcycle Scooter Parts Accessories
• condition: Used

seller cyclevintagee:

• # reviews: 2318
• city: Watsonville, California
• rating: 99.7%

payments cyclevintagee:

• wallet: Google-pay
• credit card: Mastercard
• other

returns cyclevintagee:

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

shipping cyclevintagee:

• transit: 4-9 Days
• service: USPS Ground Advantage
• class: Standard
• carrier: USPS
• cost: $0.00
• type: Calculated

offer cyclevintagee:

• options: Ship-to-home
• availability: In Stock
• sold: 0
• started: April 12, 2026
• quantity: 1

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