1. Motorcycle Speedometers For Sale
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  3. HARLEY DAVIDSON 509-DT

HARLEY-DAVIDSON 509-DT Flathead Stewart Warner Speedometer

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

509-dt Harley-davidson Original 1941-46 Knucklehead Ul Wl Flathead Stewart Warner Speedometer

( Brand: Harley-davidson ), ( Manufacturer Part Number: 509-DT ), ( Part Type: Speedometer ), ( Country Of Origin: United States )

Review HARLEY DAVIDSON Original Ul Wl Flathead Stewart Warner Speedometer fits KNUCKLEHEAD 1941-46

The **Harley-Davidson 509-DT Knucklehead Flathead from 1941 to 1946**, equipped with a **Stewart-Warner speedometer**, is a legendary piece of American motorcycle engineering that embodies the raw, unrefined spirit of an era when motorcycles were built to endure, not merely to impress. This model represents the pinnacle of Harley-Davidson s early Flathead V-twin evolution, distinguished by its iconic **Knucklehead** cylinder heads so named for their distinctive, knuckle-like valve covers which were a departure from the simpler, more utilitarian designs of its predecessors. The **509-DT** designation itself hints at its displacement: a robust **74 cubic inches (1,212 cc)**, a figure that remained a staple of Harley s lineup for decades, delivering a deep, throaty growl that resonates with the purest form of mechanical poetry. Under the hood, the **Flathead engine** with its side-valve configuration, cast-iron block, and overhead exhaust ports exemplifies a design philosophy rooted in simplicity and durability. The **Stewart-Warner speedometer**, a hallmark of mid-century automotive instrumentation, adds a touch of vintage authenticity, its analog dials and mechanical linkages offering a tactile connection to the machine s performance. This era of Harley-Davidson motorcycles was characterized by a rugged, no-nonsense approach, where functionality often took precedence over aesthetics, yet the result was a machine that exuded confidence and character. The **Knucklehead** s valve springs, housed within the distinctive knuckle-shaped covers, allowed for higher RPM potential compared to earlier models, though it still retained the Flathead s signature torque and low-end grunt. The frame, typically a pressed-steel or early tubular design, was built to handle the demands of long-distance touring, off-road adventures, or the rough-and-tumble streets of post-war America. With its **dual exhaust pipes**, **spoked wheels**, and often a **springer front fork** (or later, the more refined **hydraulic fork** in some later 40s models), the **509-DT** stands as a testament to an era when motorcycles were not just vehicles, but extensions of the rider s personality uncompromising, free-spirited, and built to last. Whether cruising along a sunbaked highway, tackling winding backroads, or simply parked as a centerpiece in a garage, this motorcycle carries the weight of history, its mechanical soul humming with the same unyielding determination that defined Harley-Davidson s early legacy.

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

#### **Pros**

1. **Historical Significance and Rarity**

The Knucklehead is one of the most iconic and sought-after Harley-Davidson models from the pre-war era. Its distinctive design, including the knucklehead valve covers, makes it a prized collector s item. The Stewart-Warner speedometer adds to its rarity, as many early Harleys came with simpler gauges.

2. **Classic Harley-Davidson Engineering**

The 509-DT features Harley s legendary flathead engine, known for its simplicity, durability, and timeless power delivery. The 74-cubic-inch displacement provides a smooth, torque-rich experience that remains enjoyable even by modern standards.

3. **Restoration Potential**

Many Knuckleheads are in need of restoration, which can be both rewarding and cost-effective. With proper care, these bikes can be brought back to their original glory, offering a unique blend of vintage charm and mechanical satisfaction.

4. **Community and Enthusiast Appeal**

Owning a Knucklehead grants access to a passionate community of vintage Harley enthusiasts. Restorers and riders often share knowledge, parts, and restoration tips, making ownership a fulfilling experience for those who appreciate classic motorcycles.

5. **Potential for Investment**

Well-preserved Knuckleheads, especially those with original components like the Stewart-Warner speedometer, can appreciate in value over time. For collectors, this makes them a viable long-term investment.

6. **Unique Driving Experience**

The Knucklehead s raw, unpolished character offers a different riding experience compared to modern bikes. The lack of modern refinements means more noise, vibration, and a direct connection to the engine, appealing to purists.

7. **Customization Opportunities**

While the original bike may be basic, there are countless ways to modify or restore it to suit personal preferences whether through classic paint jobs, period-correct upgrades, or even modern tweaks (within reason).

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#### **Cons**

1. **High Maintenance and Restoration Costs**

The Knucklehead is not a "plug-and-play" bike. Many components, such as the carburetor, ignition system, and mechanical linkages, are outdated and require specialized knowledge or parts. Restoration can be time-consuming and expensive, especially if original or period-correct parts are needed.

2. **Lack of Modern Convenience**

Unlike modern motorcycles, the Knucklehead lacks features such as electric starters, disc brakes, suspension, and modern fuel injection. This means manual cranking, drum brakes, and a basic electrical system that may require frequent attention.

3. **Fuel and Emissions Challenges**

The flathead engine runs on leaded fuel, which is no longer widely available. Finding the right octane and additives can be difficult, and some areas have restrictions on older engines. Additionally, emissions regulations may make it illegal to ride in certain locations without modifications.

4. **Reliability and Durability Concerns**

While the engine is robust, the overall build quality of a 70 year-old bike is not guaranteed. Rust, worn-out bearings, and outdated materials can lead to unexpected breakdowns. A thorough inspection is essential before purchase.

5. **Limited Availability of Parts**

While the Knucklehead community is strong, some parts especially original or period-correct ones can be hard to find. Modern aftermarket parts may not fit perfectly, requiring additional work to adapt them.

6. **Insurance and Legal Issues**

Vintage motorcycles often come with higher insurance premiums due to their value and potential repair costs. Additionally, some jurisdictions have restrictions on pre-1970 bikes, requiring special permits or modifications to meet modern safety standards.

7. **Riding Experience Limitations**

The bike s heavy weight, lack of modern ergonomics, and basic braking system make it less practical for long-distance riding or highway use. It s best suited for short, leisurely rides or static display rather than daily commuting.

8. **Time and Commitment Required**

Owning a Knucklehead is not just about riding it s about maintaining, restoring, and preserving. This requires significant time, effort, and patience, which may not be ideal for casual riders.

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### **Conclusion and Recommendation**

The **1941-46 Harley-Davidson 509-DT Knucklehead with a Stewart-Warner speedometer** is a remarkable piece of automotive history, offering unmatched charm and character for the right owner. It is best suited for **enthusiasts who appreciate classic motorcycles, enjoy restoration projects, and value the unique experience of riding a pre-war Harley**.

**If you are:**

- Willing to invest time and money into restoration or maintenance.

- Interested in joining a community of vintage motorcycle enthusiasts.

- Prepared for the challenges of an outdated but rewarding machine.

- Looking for a project bike rather than a daily rider.

**Then purchasing a Knucklehead could be a deeply satisfying and potentially valuable endeavor.**

**However, if you are:**

- Seeking a reliable, modern, or low-maintenance motorcycle.

- Unwilling to commit to extensive restoration work.

- Looking for a bike that can handle long distances or highway speeds comfortably.

- Concerned about insurance costs or legal restrictions in your area.

**Then a Knucklehead may not be the best choice, and a more modern or restored classic bike might be a more practical alternative.**

For those who truly love the era and are ready for the challenge, a Knucklehead remains one of the most exciting and rewarding motorcycles to own. Just be prepared for the journey.

Details:

The side edge plastic cover has the typical cracks, see pics.

specifications speedometercycleiz:

  • for models: Knucklehead
  • for makes: Harley
  • for years: 1941-46
  • brand: Harley-davidson
  • mpn: 509-dt
  • part type: Speedometer
  • country of origin: United States

shipping speedometercycleiz:

  • service: USPS Priority Mail
  • type: Calculated
  • carrier: USPS
  • class: Expedited
  • cost: $13.58
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  • rating: 99.4%
  • # reviews: 13904
  • city: Cedar Springs, Michigan

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  • Motorcycle Scooter Parts Accessories > Instruments Gauges > Individual Gauges
  • condition: Used

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  • availability: In Stock
  • quantity: 1
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  • started: April 1, 2026

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for models: knucklehead, for makes: harley, for years: 1941-46, part type: speedometer, country of origin: united states,
category: motorcycle parts > motorcycle scooter parts accessories > instruments gauges > individual gauges, sku: 8911272235004853,
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