HARLEY DAVIDSON B78EUG20 Carb Body
fits make: Harley.
( Brand: Harley Davidson ), ( Manufacturer Part Number: B78EUG20 ), ( Vintage Part: Yes )
Review HARLEY DAVIDSON Genuine Carb Body Motorcycle Inch
The **Harley-Davidson B78EUG20 Carb Body** is a meticulously engineered, high-performance component designed exclusively for the iconic Harley-Davidson Big Twin engines, specifically tailored for models equipped with the legendary **Evo carburetion system**. This precision-crafted carb body serves as the foundational housing for the **Evo carburetor**, a hallmark of Harley s legendary air-cooled, pushrod V-Twin architecture, and is integral to maintaining the raw, throaty growl and unmistakable character that defines the brand s legendary sound and performance. Built to exacting standards, the B78EUG20 carb body is forged from durable, high-grade aluminum alloy, ensuring a robust yet lightweight construction that resists warping under the intense heat and pressure generated during high-performance operation. Its sleek, angular design not only enhances the aesthetic appeal of the engine bay but also optimizes airflow dynamics, contributing to a more efficient and responsive throttle response. The carb body features a **threaded intake port** compatible with the original Evo carburetor, allowing for seamless integration with the stock fuel delivery system while accommodating aftermarket modifications such as high-flow carburetors, performance air filters, or custom intake manifolds. Whether installed in a classic cruiser, a high-performance street bike, or a custom chopper, this carb body embodies Harley-Davidson s commitment to timeless engineering, blending heritage with modern adaptability. For enthusiasts seeking to preserve the soul of their Big Twin while pushing the boundaries of performance, the B78EUG20 carb body stands as a testament to Harley s enduring legacy of craftsmanship and mechanical artistry.
### **Pros and Cons of Buying a Harley-Davidson B78EUG20 Carburetor Body**
The **Harley-Davidson B78EUG20** is a carburetor body designed for **Evo engines** (primarily the **Evo 883, 1200, and 1340 models**) and is often sought after for its performance and reliability. Below is a detailed breakdown of its advantages and disadvantages.
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### **Pros**
1. **Proven Performance**
- The B78EUG20 is a well-established carburetor body, known for delivering strong throttle response and smooth power delivery in Harley-Davidson Evo engines.
- It is widely used in both stock and modified applications, meaning there is a large pool of knowledge and tuning experience available.
2. **Compatibility with Aftermarket Modifications**
- Works well with **aftermarket carburetor kits** (such as **Holley, Edelbrock, or Mike s Carburetion**) for increased horsepower and torque.
- Can be paired with **performance cams, headers, and fuel injection conversions** for better efficiency and power.
3. **Ease of Maintenance and Tuning**
- The design is relatively straightforward, making it easier to clean, adjust, and modify compared to some modern fuel-injected systems.
- Many mechanics and DIY enthusiasts are familiar with its operation, reducing troubleshooting time.
4. **Cost-Effective for Modifications**
- Since it is a carburetor body, upgrading to a **high-performance carb kit** (such as a **Holley 600 or 750 series**) is often more affordable than converting to full fuel injection.
- Parts and rebuild kits are widely available, keeping long-term costs lower than some electronic fuel injection (EFI) systems.
5. **Good for Classic Harley Mods**
- If you're restoring or modifying an older Harley (especially **Evo-era bikes**), the B78EUG20 is a solid choice for maintaining a classic feel while improving performance.
- Many enthusiasts prefer carbureted setups for a more "vintage" driving experience.
6. **Decent Fuel Economy (Compared to Stock Evo)**
- While not as efficient as modern fuel-injected engines, it still offers better fuel economy than a heavily modified stock Evo carb setup.
7. **No Electronic Failures**
- Unlike fuel-injected systems, carburetors do not rely on sensors or ECUs, meaning fewer potential electronic malfunctions.
---
### **Cons**
1. **Less Efficient Than Fuel Injection**
- Carburetors are inherently less efficient than modern fuel injection systems, especially under heavy throttle or at high RPMs.
- Fuel economy and emissions performance will not match newer Harley-Davidson engines with **EFI (Electronic Fuel Injection)**.
2. **Sensitivity to Fuel Quality**
- Carburetors can clog or perform poorly with **low-quality fuel or ethanol-blended gasoline**, requiring more frequent cleaning.
- Ethanol content in fuel can cause **carburetor icing** in cold weather, leading to stalling or rough idling.
3. **Maintenance Requirements**
- Unlike fuel injection, carburetors require **regular adjustments, cleaning, and rebuilds** to maintain optimal performance.
- **Float level, jets, and needles** must be checked and replaced periodically, adding to upkeep costs.
4. **Limited Tuning Flexibility**
- While carburetors can be tuned, they lack the precision of **sequential fuel injection**, which can optimize power delivery across the entire RPM range.
- Achieving **high-performance levels** often requires multiple carburetor kits or complex setups, which can be expensive.
5. **Potential for Tuning Errors**
- Improperly tuned carburetors can lead to **lean or rich mixtures**, causing **poor acceleration, overheating, or even engine damage**.
- Unlike EFI, there is no real-time feedback to adjust fuel delivery dynamically.
6. **Environmental and Emissions Concerns**
- Carbureted engines produce **more hydrocarbons and CO emissions** compared to modern fuel-injected bikes, which may not comply with stricter emissions regulations in some areas.
7. **Depreciation in Modern Market**
- As Harley-Davidson shifts toward **fuel injection (e.g., Twin Cam, Evolution Air, and newer EFI engines)**, carbureted setups are becoming less common.
- Future parts availability and tuning support may decrease over time.
8. **Cold Weather Issues**
- Carburetors can suffer from **carburetor icing** in cold conditions, leading to **hard starting or stalling** until the engine warms up.
- This is less of an issue with modern fuel-injected systems.
---
### **Conclusion**
The **Harley-Davidson B78EUG20 carburetor body** is a **solid choice for enthusiasts** who prioritize **performance, modifiability, and a classic driving experience** over modern efficiency. It excels in **aftermarket tuning flexibility, ease of maintenance (compared to EFI), and cost-effectiveness** for modifications.
However, if **fuel efficiency, reliability in varying conditions, and long-term maintainability** are key concerns, a **modern fuel-injected Harley (or a carb-to-EFI conversion)** may be a better investment. Carburetors are best suited for **restomod projects, high-performance builds, or riders who enjoy the tuning process** rather than those seeking plug-and-play convenience.
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### **Recommendation**
- **Buy the B78EUG20 if:**- You are restoring or modifying an **Evo-era Harley** and want a **high-performance carburetor setup**.
- You enjoy **tuning and modifying** your engine and are willing to maintain it properly.
- You prefer the **throttle response and feel** of a carbureted engine over fuel injection.
- You plan to pair it with **aftermarket carb kits** (Holley, Edelbrock) for increased power.
- **Avoid the B78EUG20 if:**- You want **maximum fuel efficiency and modern reliability**.
- You prefer a **low-maintenance, plug-and-play** engine solution.
- You ride in **extreme climates** where carburetor icing or fuel quality issues could be problematic.
- You plan to keep the bike long-term, as **future parts support for carburetors may decline** as Harley shifts to EFI.
For **daily riders or those seeking the latest technology**, a **modern Harley with fuel injection** (such as the **Sportster 1200, Street Glide, or newer Twin Cam models**) is likely the better long-term choice. However, for **performance-focused enthusiasts**, the **B78EUG20 remains a strong option** when properly maintained and tuned.
Details:
Only the body and what is shown in pictures included. They all must go. Please look at the pictures closely as they are part of and show actual condition. I recommend cleaning all the threads, port and fuel holes passages before installing.
This is leftover inventory from Orbison Harley-Davidson, the Harley Davidson dealer in Dayton Beach 1962 till 1993. I ship as soon can but once its in USPS hands can't control the speed. Missing parts will need part to make work listed for parts only Used genuine Carburetor body Harley-Davidson motorcycles, pictures show the condition and are of.
part #: b78eug20 price
- $49.99
specifications cyclevintagee:
- for makes: Harley
- brand: Harley Davidson
- mpn: B78eug20
- vintage part: Yes
offer cyclevintagee:
- sold: 0
- quantity: 1
- started: April 5, 2026
- options: Ship-to-home
- availability: In Stock
general cyclevintagee:
- condition: For parts or not working
- Parts Accessories > Motorcycle Scooter Parts Accessories > Other Motorcycle Scooter Parts Accessories
shipping cyclevintagee:
- transit: 4-10 Days
- carrier: USPS
- cost: $18.00
- type: Calculated
- class: Expedited
- service: USPS Priority Mail
returns cyclevintagee:
- paid by: Buyer
- policy: Returns Accepted
- time: 30 Days
seller cyclevintagee:
- city: Daytona Beach, Florida
- rating: 100.0%
- # reviews: 6677
payments cyclevintagee:
- wallet: Google-pay
- credit card: Diners-club
- other
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