SU 404F Carburetors Midget Sprite 404r /ah

( Brand: Su ), ( Manufacturer Part Number: 404F ), ( Choke Type: Mechanical ), ( Type: Carburetor ), ( Vintage Part: Yes ), ( Country Of Origin: United Kingdom ), ( Performance Part: No )

Review SU Carburetors Complete Aud Mg Midget /ah Sprite fits HS4 1971

Introducing the SU Carburetors, specifically the SU 404F HS4 and SU 404R models, which were commonly used in the 1971 Midget and AH Sprite automobiles. These carburetors are renowned for their exceptional performance and reliability, making them a favorite among classic car enthusiasts.

The SU 404F HS4 is a twin-choke carburetor, meaning it has two separate intake manifolds, each feeding a single carburetor. This design allows for improved engine performance and response, particularly in low to mid-range revs. The HS4 variant features a twin-plunger design for the float chambers, which helps maintain a consistent fuel level and ensures a smooth fuel delivery. The carburetor is also equipped with a central accelerator pump, which provides additional fuel during rapid acceleration, ensuring a responsive driving experience.

On the other hand, the SU 404R model is a single-choke carburetor, featuring a single intake manifold and a single carburetor. Despite its simplicity, the 404R delivers impressive performance, with a smooth idle and strong mid-range power. It features a venturi design with a single jet, which allows for precise fuel delivery and excellent fuel economy. The 404R also includes an automatic choke mechanism, which simplifies starting procedures and eliminates the need for manual choke operation.

Both the SU 404F HS4 and SU 404R carburetors are built to the highest standards, with precision machining, durable components, and robust construction. They are also easy to tune and maintain, with accessible adjustment screws and a clear sight window for easy fuel level monitoring. These carburetors are a must-have for any classic car enthusiast looking to restore or upgrade their 1971 Midget or AH Sprite, offering improved performance, reliability, and that authentic driving experience.

The SU Carburetors, specifically the SU HS4 and SU404F models, were commonly used in various classic cars including the 1971 Midget/Austin Healey Sprite. While these carburetors have their merits, there are also some drawbacks to consider when deciding to purchase them.

1. Rich History: SU Carburetors have a long-standing reputation in the classic car community. They were originally developed in the UK and have been used in various race cars and production vehicles since the 1950s.

2. Performance: SU Carburetors are known for their excellent performance, especially when it comes to delivering smooth power and responsiveness. The HS4 and 404F models offer good fuel economy and are suitable for both high-performance and standard applications.

3. Adjustability: SU Carburetors offer a high degree of adjustability, allowing users to fine-tune the fuel mixture for optimal performance based on driving conditions and engine characteristics.

4. Durability: These carburetors are built to last, using robust materials and designs that can withstand the rigors of regular use.

1. Complexity: SU Carburetors can be more complex to set up and maintain compared to modern fuel injection systems. They require a good understanding of carburetor tuning principles and the ability to adjust various settings to achieve optimal performance.

2. Availability: While SU Carburetors are still produced and available for purchase, their availability may be limited in certain markets, making it harder to find replacement parts or specialized tools for repair and maintenance.

3. Cost: SU Carburetors can be more expensive than modern fuel injection systems, especially when considering the cost of specialized tools, replacement parts, and maintenance.

4. Emissions: SU Carburetors do not meet modern emissions standards and may not be suitable for use in vehicles that require emissions compliance.

SU Carburetors offer excellent performance, rich history, and durability, but they come with the complexity, limited availability, and higher cost compared to modern fuel injection systems. If you are a classic car enthusiast looking for authenticity and performance, the SU HS4 and 404F carburetors may be a great choice. However, if you value ease of use, availability of parts, and lower costs, a modern fuel injection system might be a better option. Ultimately, the decision depends on your priorities, budget, and the specific requirements of your 1971 Midget or Austin Healey Sprite.

Details:

SU HS4 CARBURETORS COMPLETE AUD 404R AUD 404F 1971 MG MIDGET /AH SPRITE, CARBS WILL NEED A REBUILD.

part #: 404f prices

• $125.00-$200.00

specifications carbcoon:

• for models: Hs4
• for years: 1971
• brand: Su
• mpn: 404f
• choke type: Mechanical
• type: Carburetor
• vintage part: Yes
• country of origin: United Kingdom
• performance part: No

shipping carbcoon:

• transit: 3-7 Days
• class: Standard
• service: UPS Ground, USPS Ground Advantage, FedEx Ground / FedEx Home Delivery
• cost: $15.27
• type: Calculated
• carrier: UPS, USPS, FedEx

offer carbcoon:

• availability: In Stock
• started: November 10, 2025
• sold: 0
• best offers: True
• options: Ship-to-home
• quantity: 1

seller carbcoon:

• # reviews: 496
• rating: 100.0%
• city: Oklahoma City, Oklahoma

returns carbcoon:

• policy: No Returns

general carbcoon:

• Car Truck Parts Accessories > Air Fuel Delivery > Carburetors
• condition: For parts or not working

payments carbcoon:

• wallet: Paypal
• other
• credit card: Discover

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