KEIHIN B78MG121 Butterfly Carburetor Fx

( Brand: Keihin ), ( Engine Type: 4-stroke ), ( Choke Type: Mechanical ), ( Type: Carburetor ), ( Machine Type: Street Motorcycle ), ( Manufacturer Warranty: 3 Months ), ( Items Included: Float Bowl Screws ), ( Manufacturer Part Number: B78MG121 ), ( Material: Aluminum ), ( Universal Fitment: No ), ( Vintage Part: Yes )

Review KEIHIN Oem Harley davidson Butterfly Carburetor Fx fits SHOVELHEAD IRONHEAD XLH FL

Keihin B78MG121 Harley-Davidson Butterfly Carburetor (Universal Fit for Flathead, Shovelhead XL, and Ironhead XLH models)

The Keihin B78MG121 Harley-Davidson Butterfly Carburetor is a high-performance replacement option for Harley-Davidson Flathead, Shovelhead XL, and Ironhead XLH motorcycle models. Designed with precision engineering and advanced technology, this carburetor delivers optimal fuel-air mixture for improved engine performance, increased power output, and smoother throttle response.

1. Universal Fit: This carburetor is designed to fit a wide range of Harley-Davidson models, including Flathead, Shovelhead XL, and Ironhead XLH engines.

2. Butterfly Design: The butterfly design of this carburetor allows for precise fuel delivery and quick response to changes in engine load and throttle position.

3. Easy Installation: With a straightforward installation process, this carburetor can be easily installed on your Harley-Davidson motorcycle, allowing you to get back on the road in no time.

4. Adjustable Main Jet: The adjustable main jet enables fine-tuning of the fuel mixture to suit your specific riding conditions and engine requirements.

5. Durable Construction: Made from high-quality materials, this carburetor is built to withstand the rigors of daily riding and provides reliable performance for thousands of miles.

6. Improved Fuel Efficiency: The advanced design of this carburetor helps improve fuel efficiency, allowing you to save money on gas and reduce your carbon footprint.

7. Smooth Throttle Response: The smooth throttle response provided by this carburetor ensures a responsive and enjoyable riding experience, making it an excellent upgrade for your Harley-Davidson motorcycle.

8. Easy-to-Read Needle and Float: The clear and easy-to-read needle and float help you monitor the fuel level and ensure proper fuel delivery to the engine.

9. High-Quality Hardware: Included with this carburetor are high-quality hardware, such as stainless steel bolts and washers, to ensure a secure and leak-free installation.

The Keihin B78MG121 Harley-Davidson Butterfly Carburetor is an excellent upgrade for your Flathead, Shovelhead XL, or Ironhead XLH Harley-Davidson motorcycle. With its universal fit, butterfly design, adjustable main jet, and durable construction, this carburetor delivers improved engine performance, increased power output, and smoother throttle response. Whether you're cruising down the highway or tackling twisty backroads, this carburetor will provide you with the power and precision you need to enjoy your ride to the fullest.

Pros and Cons of Buying a Keihin B78MG121 Harley-Davidson Butterfly Carburetor for FX, XLH, Shovelhead, and Ironhead Models

The Keihin B78MG121 carburetor is a popular aftermarket option for Harley-Davidson motorcycles with FX, XLH, Shovelhead, and Ironhead models. This carburetor is known for its improved performance and fuel economy compared to the stock carburetor. In this article, we will discuss the advantages and disadvantages of buying a Keihin B78MG121 Harley-Davidson carburetor.

1. Improved Performance: The Keihin carburetor provides better fuel mixture and airflow, resulting in improved engine performance.

2. Fuel Economy: This carburetor helps in optimizing fuel consumption, resulting in better mileage.

3. Easy Installation: The carburetor is relatively easy to install, and many users report that they were able to do it themselves.

4. Adjustability: The Keihin carburetor offers more adjustability, allowing users to fine-tune the carburetor to their specific needs.

5. Durability: The Keihin carburetor is known for its durability and reliability, making it a popular choice among Harley-Davidson riders.

1. Cost: The Keihin carburetor is more expensive than the stock carburetor, which may be a deterrent for some buyers.

2. Learning Curve: Adjusting the carburetor to optimize performance can be a complex process, and some users may find it challenging.

3. Availability of Spare Parts: Finding spare parts for the Keihin carburetor may be more difficult than for the stock carburetor.

4. Compatibility: The Keihin carburetor may not be compatible with all Harley-Davidson models, so it is essential to check compatibility before making a purchase.

The Keihin B78MG121 Harley-Davidson carburetor offers several advantages, including improved performance, better fuel economy, easy installation, adjustability, and durability. However, it also comes with some disadvantages, such as a higher cost, a learning curve for adjusting the carburetor, difficulty in finding spare parts, and compatibility issues with some Harley-Davidson models.

If you are looking for improved engine performance, better fuel economy, and increased adjustability for your Harley-Davidson motorcycle, the Keihin B78MG121 carburetor is an excellent choice. However, it is essential to consider the higher cost, the learning curve for adjusting the carburetor, and the potential difficulty in finding spare parts before making a purchase. It is also important to ensure that the carburetor is compatible with your specific Harley-Davidson model before making a purchase.

part # b78mg121 prices

• $40.00-$169.99

specifications iodacarb:

• for models: Xlh, Fl, Shovelhead, Ironhead
• for makes: Harley, Davidson
• brand: Keihin
• engine type: 4-stroke
• choke type: Mechanical
• type: Carburetor
• machine type: Street Motorcycle
• manufacturer warranty: 3 Months
• items included: Float Bowl Screws
• manufacturer part number: B78MG121
• material: Aluminum
• universal fitment: No
• vintage part: Yes

general iodacarb:

• Motorcycle Scooter Parts Accessories > Air Intake Fuel Delivery > Carburetors
• condition: Used

payments iodacarb:

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

returns iodacarb:

• policy: No Returns

shipping iodacarb:

• service: USPS Ground Advantage
• type: Calculated
• class: Standard
• cost: $8.65
• transit: 3-8 Days
• carrier: USPS

seller iodacarb:

• # reviews: 290
• rating: 100.0%

offer iodacarb:

• started: January 27, 2026
• best offers: True
• sold: 0
• availability: In Stock
• options: Ship-to-home
• quantity: 1

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