1. Motorcycle Speedometers For Sale
  2. sku: 8812010918641741
  3. HARLEY DAVIDSON 509DWM5

HARLEY-DAVIDSON 509DWM5 Stewart Warner Speedometer Flathead 10-120

fits model: Knucklehead. make: Harley. year: 1941-46.

509dwm5 Harley-davidson Original 1941-46 Stewart Warner Speedometer 10-120 Flathead Knucklehead

( Brand: Harley-davidson ), ( Manufacturer Part Number: 509DWM5 ), ( Unit Of Measure: Mph ), ( Type: Speedometer Gauge ), ( Display Type: Analog ), ( Vintage Part: Yes ), ( Maximum Speedometer Value: 120 Mph ), ( Country Of Origin: United States )

Review HARLEY DAVIDSON Original Stewart Warner Speedometer 10-120 Flathead fits KNUCKLEHEAD 1941-46

The **Harley-Davidson 509DWM5 (1941 1946) Stewart-Warner Speedometer (10 120 mph) for Flathead Knucklehead Models** is a meticulously crafted, vintage instrument that embodies the rugged elegance of America s golden era of motorcycle engineering. This rare and highly sought-after speedometer was originally designed to accompany Harley-Davidson s legendary **Knucklehead** engines, the first production V-twin motorcycles to feature individual cylinder heads a groundbreaking innovation that set the standard for power and performance in the 1940s. The **509DWM5** model, produced between 1941 and 1946, was specifically engineered to integrate seamlessly with Harley s **74-cubic-inch Flathead** engines, delivering precise, reliable readings for riders navigating both the open road and the demands of wartime utility.

What makes this speedometer truly exceptional is its **Stewart-Warner construction**, a brand synonymous with automotive and motorcycle instrumentation during the mid-20th century. The dial itself is a study in functional artistry, featuring a **bold, black-and-white face** with a **10 120 mph scale**, allowing riders to monitor their speed with clarity and confidence. The **needle, mounted on a sturdy brass spindle**, glides effortlessly across the dial, its polished finish reflecting the mechanical precision of the era. The **backlit illumination** a hallmark of vintage Harley instrumentation ensures visibility even in low-light conditions, a practical feature that underscores the motorcycle s dual-purpose design for both civilian and military use.

Beyond its technical specifications, this speedometer carries a **rich historical legacy**, having been fitted to Harley-Davidson models that played a pivotal role in World War II. The **Knucklehead engines** powering these bikes were renowned for their durability and adaptability, often modified for military applications, including sidecar outfits for troop transport and reconnaissance. The **509DWM5** speedometer, with its **knurled brass bezel and sturdy mounting bracket**, was built to withstand the rigors of both civilian and combat environments, making it a prized artifact for collectors and enthusiasts alike.

For the modern restorer or purist seeking to preserve the authenticity of a **1941 1946 Harley-Davidson**, this speedometer is an indispensable component. Its **vintage wiring harness and mechanical reliability** ensure a seamless fit with the original electrical system, while its **timeless design** adds a touch of nostalgia to any restored Knucklehead. Whether installed on a meticulously rebuilt classic or displayed as part of a museum-quality exhibit, the **Harley-Davidson 509DWM5 Stewart-Warner speedometer** stands as a testament to an era when American engineering defined the spirit of freedom on two wheels.

### **Pros and Cons of Buying a 1941-46 Harley-Davidson 509DWM5 (Stewart-Warner Speedometer, Flathead Knucklehead)**

#### **Pros**

1. **Historical Significance and Rarity**

The 1941-46 Harley-Davidson 509DWM5 is a classic model from the early days of Harley-Davidson, representing a transitional era between the pre-war and post-war designs. These bikes are highly sought after by collectors and enthusiasts, making them valuable in the vintage market. The Stewart-Warner speedometer (10-120 mph) is particularly rare, adding to its desirability.

2. **Mechanical Simplicity and Durability**

The Flathead engine (Model 509) is known for its robustness and simplicity. Unlike modern engines with complex electronics and fuel injection, the Flathead relies on a carbureted, side-valve design that is easier to repair and maintain. Many of these engines, when properly cared for, can last well beyond 100,000 miles.

3. **Classic Harley-Davidson Aesthetics**

The Knucklehead (Model 509) design is iconic, with its distinctive round headlights, simple fenders, and vintage styling. The bike s appearance is a throwback to the early 20th century, appealing to those who appreciate classic motorcycles. The Stewart-Warner speedometer adds to its vintage charm, offering a nostalgic driving experience.

4. **Potential for Restoration and Customization**

These bikes are often purchased by restorers who enjoy bringing them back to their original condition or modifying them to suit modern tastes. The open-frame design allows for easy customization, from paint jobs to engine upgrades (though Flathead engines are generally not modified for high-performance use).

5. **Community and Enthusiast Appeal**

Owning a 1941-46 Harley-Davidson connects you to a passionate community of vintage motorcycle enthusiasts. There are clubs, meetups, and forums dedicated to these bikes, providing opportunities to share knowledge, restoration tips, and riding experiences.

6. **Lower Running Costs (Compared to Modern Bikes)**

While parts can be expensive, the simplicity of the Flathead engine means fewer components to fail. Basic maintenance (oil changes, valve adjustments, chain tension) is straightforward and often cheaper than maintaining a modern bike with advanced electronics.

---

#### **Cons**

1. **High Cost of Ownership**

Parts for a 1941-46 Harley-Davidson, especially for a rare model like this one, can be costly. Original parts are scarce, and many must be sourced from specialty suppliers or restored from other bikes. The Stewart-Warner speedometer, in particular, may require careful handling to avoid damage.

2. **Reliability and Maintenance Challenges**

While the Flathead engine is durable, it is not as refined as modern engines. Common issues include:

- **Valve adjustments** (must be done regularly to prevent overheating or poor performance).

- **Carburetor tuning** (vintage carburetors like the Amal or Dell Orto can be finicky and require frequent cleaning or replacement).

- **Electrical system** (early Harleys often have weak or unreliable wiring, and the Stewart-Warner speedometer may need restoration).

- **Brakes** (drum brakes are less effective than modern disc brakes, requiring careful riding in stop-and-go traffic).

3. **Limited Modern Comfort and Safety Features**

The bike lacks modern amenities such as:

- **Disc brakes** (drum brakes are less effective in wet or heavy braking conditions).

- **Modern suspension** (early Harleys have basic springer forks and rear shocks, which can be uncomfortable on rough roads).

- **Fuel injection or electronic ignition** (carbureted engines are less efficient and require more frequent tuning).

- **Modern ergonomics** (the riding position is more upright and less aggressive than contemporary bikes, which may not suit all riders).

4. **Fuel Efficiency and Performance Limitations**

The 509DWM5 has a displacement of 74 cubic inches (1.2L) and produces around 30-35 horsepower, which is modest by today s standards. Fuel economy is poor, and the bike is not suited for high-speed cruising or long-distance touring without frequent stops.

5. **Legal and Insurance Considerations**

- **Registration and Insurance:** Vintage bikes often require special registration or insurance, which can be more expensive than insuring a modern motorcycle.

- **Emissions and Safety Standards:** In some regions, classic bikes may not meet modern emissions or safety standards, requiring modifications or exemptions.

- **Road Legality:** Some states or countries have restrictions on vintage bikes, particularly regarding headlights, taillights, and turn signals.

6. **Time-Consuming Restoration and Upkeep**

If the bike is not in perfect condition, restoring it to running order can be a significant time investment. Rust, worn-out components, and outdated materials (e.g., original rubber parts) may require extensive work to bring the bike back to usability.

7. **Market Value Fluctuations**

While these bikes appreciate in value over time, the market can be unpredictable. A well-maintained 1941-46 Harley-Davidson may hold its value, but a neglected one could become a money pit. Selling a restored bike may not always recoup the investment, especially if the market shifts.

---

### **Conclusion and Recommendation**

#### **Who Should Buy This Bike?**

This 1941-46 Harley-Davidson 509DWM5 is ideal for:

- **Enthusiasts and collectors** who appreciate vintage motorcycles and are willing to invest time and money into restoration or maintenance.

- **Riders who prioritize nostalgia and the classic Harley-Davidson experience** over modern convenience and performance.

- **Those with mechanical skills or access to a trusted mechanic** who can handle the bike s quirks and occasional repairs.

- **Participants in vintage motorcycle clubs or events** where owning a rare model like this is a point of pride.

#### **Who Should Avoid This Bike?**

This bike is not suitable for:

- **Casual riders** who want a hassle-free, modern motorcycle for daily commuting or long-distance travel.

- **Those on a tight budget** who cannot afford the cost of parts, restoration, or unexpected repairs.

- **Riders who prioritize safety and modern features** (e.g., ABS brakes, traction control, fuel injection).

- **People who dislike tinkering with mechanical systems** or do not have access to vintage motorcycle expertise.

#### **Final Recommendation**

If you are passionate about vintage motorcycles and have the resources (time, money, and mechanical knowledge) to care for a classic Harley-Davidson, then purchasing this 1941-46 509DWM5 can be a rewarding experience. The bike offers a unique connection to Harley-Davidson s history and the satisfaction of restoring or maintaining a piece of automotive heritage.

However, if you are looking for a practical, low-maintenance, or high-performance motorcycle, this is not the right choice. Instead, consider a modern cruiser, a restored mid-century Harley (e.g., a 1960s Panhead or 1970s Knucklehead), or a well-maintained vintage bike with fewer restoration challenges.

**For the right buyer, this bike is a treasure. For the wrong buyer, it could become a costly hobby.** Always thoroughly inspect the bike s condition, consult with experts, and consider whether you are prepared for the long-term commitment before making a purchase.

Details:

For parts or repair only. Used, rusty, untested, and without front glass.

part #: 509dwm5 prices

  • $225.00-$1699.00

specifications speedometercycleiz:

  • for models: Knucklehead
  • for makes: Harley
  • for years: 1941-46
  • brand: Harley-davidson
  • mpn: 509dwm5
  • unit of measure: Mph
  • type: Speedometer Gauge
  • display type: Analog
  • vintage part: Yes
  • maximum speedometer value: 120 Mph
  • country of origin: United States

seller speedometercycleiz:

  • city: Columbus, Indiana
  • # reviews: 10244
  • rating: 99.9%

shipping speedometercycleiz:

  • class: Standard
  • type: Fixed
  • transit: 2-7 Days
  • cost: $7.95
  • service: Standard

returns speedometercycleiz:

  • policy: No Returns

payments speedometercycleiz:

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

general speedometercycleiz:

  • condition: For parts or not working
  • Motorcycle Scooter Parts Accessories > Instruments Gauges > Individual Gauges

offer speedometercycleiz:

  • sold: 0
  • availability: In Stock
  • options: Ship-to-home
  • quantity: 1
  • started: February 10, 2026
for models: knucklehead, for makes: harley, for years: 1941-46, unit of measure: mph, type: speedometer gauge, display type: analog, vintage part: yes, maximum speedometer value: 120 mph, country of origin: united states,
category: motorcycle parts > motorcycle scooter parts accessories > instruments gauges > individual gauges, sku: 8812010918641741,
Harley-davidson 509DWM5 Is Similar To:
speedometercycleiz logo
5 offers $225.00–$1699.00 USD
  • For parts or not working. Offer #1 priced at $225.00 + $14.67 shipping estimate = $239.67* total. +$14.67 shipping
  • Used. Offer #2 priced at $285.00 + $6.95 shipping estimate = $291.95* total. +$6.95 shipping
  • Used. Offer #3 priced at $1699.00 + $18.00 shipping estimate = $1717.00* total. +$18.00 shipping
  • Used. Offer #4 priced at $279.99 + $15.00 shipping estimate = $294.99* total. +$15.00 shipping
  • Used. Offer #5 priced at $1675.00 + $15.00 shipping estimate = $1690.00* total. +$15.00 shipping

Copyright © speedometercycleiz.com