CUSTOM CHROME 27-040 Doss Tail Lamp Brake Light

( Brand: Custom Chrome ), ( Manufacturer Part Number: 27-040 ), ( Light Color: Red ), ( Mounting Style: Screws, Bracket Mount ), ( Machine Type: Street Motorcycle ), ( Items Included: Ballast, Bulbs ), ( Item Length: 6 In ), ( Type: Tail Light Assembly ), ( Item Height: 3.5 In ), ( Housing Color: Chrome ), ( Country Of Origin: United States ), ( Item Width: 5.25 In ), ( Lighting Technology: Led )

Review CUSTOM CHROME Harley Davidson Doss Tail Lamp Brake Light fits 1939–1998

This rare and highly sought-after **1939 Harley-Davidson Doss Tail Lamp and Brake Light Assembly**, cataloged under the part number **27-040**, represents a pristine example of early Harley-Davidson engineering craftsmanship from the golden era of American motorcycle design. Originally manufactured in 1973 but based on the iconic 1939 1998 Doss-style tail lamp assembly, this piece is a functional and visually striking artifact of Harley s mid-century aesthetic, blending vintage charm with enduring utility. The assembly features a classic **Doss-style tail light**, characterized by its distinctive **oval, chrome-plated lens** with a subtle, textured glass surface that diffuses light while maintaining a sleek, retro silhouette. The lens is securely mounted within a robust **cast aluminum housing**, a hallmark of Harley s early manufacturing techniques, which balances durability with a lightweight, streamlined appearance. The assembly is designed to be easily retrofitted onto Harley-Davidson motorcycles from the **1939 through 1998 model years**, particularly those equipped with the iconic **Doss-style fenders**, making it a versatile upgrade for vintage enthusiasts seeking authenticity or modern riders aiming to restore classic styling cues.

Beyond its aesthetic appeal, this tail lamp and brake light assembly embodies the functional elegance of Harley s early electrical systems. The **incandescent bulb socket** is positioned centrally within the lens, allowing for a clean, unobstructed light projection while ensuring the bulb remains protected from the elements. The **brake light mechanism** is integrated seamlessly into the assembly, featuring a reliable **push-pull cable linkage** that activates the light when the brake lever is engaged, a design that has remained largely unchanged in its fundamental operation for decades. The entire unit is secured with **chrome-plated mounting brackets and screws**, ensuring a secure and weather-resistant fit, while the **black-painted metal base** provides a subtle contrast to the gleaming chrome, enhancing the assembly s vintage allure.

For collectors and restorers, this **1939 Harley-Davidson Doss Tail Lamp and Brake Light Assembly** is not merely a functional component but a tangible piece of automotive history. Its inclusion in Harley s production lines during the **1970s and 1990s** while drawing from the original 1939 design highlights the brand s commitment to preserving its heritage while adapting to modern demands. Whether installed on a fully restored **1940s-era Harley-Davidson**, a custom-built chopper, or a modern bike seeking a nod to classic styling, this assembly offers a perfect blend of nostalgia and practicality. Its rarity, combined with the meticulous attention to detail in its construction, makes it a prized addition to any motorcycle enthusiast s collection, embodying the timeless spirit of Harley-Davidson s legacy.

### **Pros and Cons of Buying a 1939 Harley-Davidson Model 741 (Doss) with a 1973-1998 Tail Lamp/Brake Light**

#### **Overview**

The 1939 Harley-Davidson Model 741 (often referred to as a "Doss" due to its association with the Doss Brothers, who popularized the bike in the 1930s) is a classic flathead V-twin motorcycle. While it is a highly sought-after vintage machine, its condition, rarity, and compatibility with modern aftermarket parts must be carefully considered before purchasing. The mention of a 1973 1998 tail lamp/brake light suggests an attempt to modernize or restore the bike, which can be both beneficial and problematic depending on execution.

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### **Pros**

1. **Historical Significance and Rarity**

- The 1939 Model 741 is a rare and well-respected classic, especially in the flathead era. Its association with the Doss Brothers adds to its cultural value.

- Original examples are highly collectible, and well-preserved ones can appreciate in value over time.

2. **Timeless Design and Aesthetics**

- The bike s vintage styling is iconic, with a simple yet robust frame, classic fenders, and a timeless engine. It appeals to enthusiasts who appreciate mechanical purity and old-school motorcycle culture.

- The flathead engine (pre-1948) is known for its smooth, low-revving character, which many riders find enjoyable.

3. **Restoration Potential**

- If the bike is in need of restoration, the flathead engine is relatively straightforward to rebuild compared to later Harley engines. Parts are available, though some may require sourcing from specialty suppliers.

- The simplicity of the drivetrain (chain or shaft drive, depending on model) makes it easier to work on than later models with complex transmissions or electronic fuel injection.

4. **Community and Enthusiast Appeal**

- Owning a classic Harley-Davidson connects you to a passionate community of vintage motorcycle enthusiasts. Events like rallies (e.g., the Doss Brothers Rally) provide opportunities to meet like-minded riders.

- The bike can serve as a conversation starter and a centerpiece for collectors or those interested in motorcycle history.

5. **Modern Tail Lamp/Brake Light Upgrade (If Done Correctly)**

- Replacing the original tail light with a modern unit (from the 1973 1998 era or later) can improve visibility and compliance with modern regulations. This is particularly useful if the bike is ridden on public roads.

- Modern tail lights are brighter and more reliable, reducing the risk of accidents due to poor lighting.

---

### **Cons**

1. **High Cost of Ownership**

- **Parts and Restoration:** Original parts for a 1939 Harley are expensive, and many must be sourced from specialty suppliers or rebuilt by experts. A full restoration can easily cost $10,000 $30,000 or more, depending on the bike s condition.

- **Labor:** Flathead engines and vintage Harley components require experienced mechanics familiar with older models. Labor costs for restoration or maintenance can be prohibitive.

- **Insurance:** Classic motorcycles, especially rare ones, often have high insurance premiums due to their value and the risk of theft or damage.

2. **Reliability and Maintenance Challenges**

- **Engine Wear:** The flathead engine, while robust, is prone to issues like piston slap, valve problems, and cylinder wear if not properly maintained. Modern riders may not be familiar with the nuances of flathead tuning.

- **Fuel System:** Carburetors (typically Amal or Harley s own designs) require regular cleaning and adjustment. Modern fuel additives and ethanol blends can damage older rubber components.

- **Electrical System:** The original wiring and lighting may be outdated and unreliable. Replacing the tail light is a good start, but other electrical components (ignition, lights, etc.) may need attention.

- **Suspension and Brakes:** Original suspension (if still present) is often worn out. Modernizing the suspension or brakes (e.g., upgrading to disc brakes) can be costly and may require custom fabrication.

3. **Modernization vs. Authenticity**

- **Tail Lamp/Brake Light Compatibility:** While replacing the tail light with a 1973 1998 unit is a practical upgrade, it may not fit perfectly without modifications. The wiring harness, mounting points, and electrical connections might require adjustments, which could void authenticity for purists.

- **Regulatory Compliance:** Modern tail lights are a good start, but other safety features (turn signals, reflectors, etc.) may need updating to meet current DOT or state regulations. This can add to the cost and complexity of ownership.

- **Engine Modifications:** If you plan to modify the engine (e.g., porting, cylinder work, or installing a modern carburetor), you may lose the bike s original character. Some enthusiasts prefer to keep the bike as close to stock as possible.

4. **Riding Experience Limitations**

- **Speed and Power:** The 1939 Model 741 is not a high-performance bike. The stock engine produces around 40 50 horsepower, which is adequate for cruising but lacks the power of modern motorcycles. Riders expecting a fast or aggressive ride may be disappointed.

- **Comfort and Ergonomics:** The bike s design is not optimized for long-distance comfort. The seat, handlebars, and footpegs may require adjustments or upgrades for modern riders.

- **Road Legality:** Vintage motorcycles often struggle with modern road conditions. Tires, brakes, and suspension may need significant upgrades to be safe for highway riding.

5. **Market Value and Depreciation**

- **Fluctuating Value:** While rare flatheads can appreciate, their value is not guaranteed. Economic factors, market trends, and the bike s condition can affect resale value.

- **Storage and Security:** Storing a classic motorcycle securely is essential to prevent theft or damage. This adds to the ongoing cost of ownership.

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### **Conclusion**

Buying a 1939 Harley-Davidson Model 741 is a significant investment in both time and money. The bike offers unmatched historical value and aesthetic appeal, making it ideal for collectors, restorers, or enthusiasts who appreciate vintage machinery. However, the challenges of restoration, maintenance, and modernization cannot be overlooked. The decision to upgrade components like the tail light is practical but should be balanced against the desire to preserve the bike s originality.

If you are mechanically inclined, passionate about vintage motorcycles, and willing to invest the time and resources into restoration, this bike can be a rewarding project. However, if you prioritize convenience, modern performance, or a hassle-free riding experience, a newer or more modern classic (e.g., a 1960s 1970s Harley) may be a more practical choice.

---

### **Recommendation**

- Before purchasing, have the bike inspected by an experienced flathead specialist. Look for signs of rust, engine wear, and structural integrity. A pre-purchase inspection is critical to avoid hidden costs.

- If the bike is not already restored, allocate a budget of at least $15,000 $25,000 for a complete rebuild. Factor in labor, parts, and unexpected expenses. Consider whether you can afford to keep the bike in running condition long-term.

- Modernize essential safety components (tires, brakes, suspension) to ensure the bike is road-legal and safe to ride. While replacing the tail light is a good start, do not neglect other critical upgrades.

- If you value authenticity, limit modifications to non-critical components (e.g., cosmetic upgrades). If practicality is the goal, be prepared to make significant changes to improve rideability and safety.

- Engage with vintage Harley-Davidson forums, clubs, or rallies to learn from experienced riders. The Doss Brothers community, in particular, offers valuable insights and support for flathead owners.

- If the 1939 Model 741 is too challenging or expensive, explore other classic Harleys with a better balance of rarity, reliability, and modernizability (e.g., a 1957 1965 Panhead or a 1966 1979 Knucklehead).

Ultimately, this bike is a dream for the right owner someone who values history, craftsmanship, and the challenge of working with vintage machinery. For others, the costs and complexities may outweigh the rewards. Carefully weigh your priorities before making a decision.

Details:

Used but very nice condition - see photos measures approx 6X 5.25 W 3.5 deep angle from base to top of lens. No gasket or hardware included. For sale is this Custom Chrome 1939 tail light for a 1973 - 1998 Harley my research indicates Rick Doss sold through.

part #: 27040 prices

• $22.03-$41.50

specifications cyclerearbrake:

• for makes: Harley, Davidson
• for years: 1939-1998
• brand: Custom Chrome
• mpn: 27-040
• light color: Red
• mounting style: Screws, Bracket Mount
• machine type: Street Motorcycle
• items included: Ballast, Bulbs
• item length: 6 In
• type: Tail Light Assembly
• item height: 3.5 In
• housing color: Chrome
• country of origin: United States
• item width: 5.25 In
• lighting technology: Led

returns cyclerearbrake:

• time: 14 Days
• paid by: Buyer
• policy: Returns Accepted

seller cyclerearbrake:

• rating: 99.3%
• city: Reno, Nevada
• # reviews: 1357

offer cyclerearbrake:

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

shipping cyclerearbrake:

• cost: $14.99
• type: Fixed
• transit: 6-10 Days
• carrier: USPS
• class: Standard
• service: USPS Ground Advantage

general cyclerearbrake:

• Motorcycle Scooter Parts Accessories > Lighting Lamps > Tail Brake Light Assemblies
• condition: Used

payments cyclerearbrake:

• wallet: Apple-pay
• other
• credit card: Diners-club

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