AMAL 389-689 Monobloc Carbs Fitted Lightning Mated 389/689 67 Pair.

( Brand: Amal ), ( Machine Type: Street Motorcycle ), ( Items Included: Float Bowl Screws ), ( Manufacturer Part Number: 389/689 ), ( Vintage Part: Yes ), ( Engine Type: 4-stroke ), ( Choke Type: Mechanical ), ( Type: Carburetor ), ( Unit Type: Unit ), ( Features: Fitted ), ( Unit Quantity: 1 Pair ), ( Performance Part: No )

Review AMAL 389/689 Monobloc Carbs Used Fitted To 67 Lightning Mated Pair. See Photos fits BSA

The AMAL MK389/689 Monobloc Carburetors are a legendary addition to the classic motorcycle scene, particularly for those riding a 1967 BSA Lightning. These carburetors are not only aesthetically pleasing but also offer exceptional performance that has made them a favorite among enthusiasts.

The Monobloc design is a testament to AMAL's engineering expertise. The carburetors feature a single body casting, which not only makes them visually appealing but also provides structural rigidity, ensuring durability and stability under various riding conditions. The body is finished in a classic AMAL chrome plating, adding an elegant touch to any motorcycle.

Each carburetor houses two separate and identical 38mm bores, which are responsible for the intake of fuel and air mixture. The sophisticated design of the venturi shape, along with the meticulously crafted needle and seat jet system, ensures efficient fuel atomization and precise fuel delivery. This results in a smooth and responsive power delivery, which is essential for the vintage BSA Lightning.

The AMAL Monobloc Carburetors come with a unique design of float bowls that are integrated into the main body. This design not only improves the overall appearance but also enhances the fuel system's performance by eliminating the need for external float bowls.

These carburetors are mated with the BSA Lightning's engine using a set of high-quality, chrome-plated, adjustable throttle quadrant slides. The slides provide precise control over the fuel mixture and engine speed, ensuring optimal performance.

The AMAL MK389/689 Monobloc Carburetors are not just a replacement part; they are an investment in the authentic classic motorcycle experience. They embody the rich history and engineering excellence that AMAL has been known for, making them a must-have for any vintage motorcycle enthusiast, especially those who own a 1967 BSA Lightning.

The Amal MK389/MK689 monobloc carburetors are a popular choice for classic motorcycle enthusiasts, especially for bikes like the 1967 BSA Lightning. These carburetors offer several advantages and disadvantages.

1. Authenticity: These carburetors are original equipment for many classic motorcycles, including the BSA Lightning. Installing them maintains the bike's authenticity and may improve its value.

2. Performance: Monobloc carburetors have a reputation for providing excellent performance. They offer smooth idling, improved throttle response, and better fuel economy compared to some other types of carburetors.

3. Adjustability: Amal carburetors are known for their ease of tuning. They offer multiple adjustment points, allowing riders to fine-tune the mixture for various riding conditions and altitudes.

4. Durability: Monobloc carburetors have a solid construction, which can make them more durable than some other types of carburetors.

1. Complexity: Monobloc carburetors have more components and are generally more complex than some other types of carburetors. This can make them more difficult to install, tune, and maintain.

2. Cost: New Amal carburetors can be quite expensive. Additionally, the cost of rebuilding or restoring used carburetors can add up.

3. Availability: Finding the correct Amal carburetor for a specific motorcycle model can be challenging. Some models are more common than others, and availability may vary depending on the market.

4. Compatibility: Installing monobloc carburetors on motorcycles that originally came with different types of carburetors can present compatibility issues. Riders may need to make modifications to the engine or fuel system to make the switch.

The decision to buy Amal MK389/MK689 monobloc carburetors for a 1967 BSA Lightning depends on several factors, including personal preferences, budget, and riding style. If you value authenticity, performance, and ease of tuning, these carburetors may be worth the investment. However, their complexity, cost, and potential compatibility issues are important considerations.

1. Ensure compatibility: Confirm that these carburetors are the correct fit for your motorcycle model.

2. Consult experts: Consider seeking advice from experienced motorcycle mechanics or Amal carburetor specialists to help with the installation and tuning process.

3. Budget for the cost: Be prepared for the financial investment required to purchase, rebuild, or restore the carburetors.

4. Consider alternatives: If the cost or complexity of monobloc carburetors is a concern, consider alternative options such as rebuilding your existing carburetors or exploring other types of carburetors that may be more budget-friendly.

part # 389689 prices

• $8.98-$25.49

specifications iodacarb:

• for models: Bsa
• brand: Amal
• machine type: Street Motorcycle
• items included: Float Bowl Screws
• manufacturer part number: 389/689
• vintage part: Yes
• engine type: 4-stroke
• choke type: Mechanical
• type: Carburetor
• unit type: Unit
• features: Fitted
• unit quantity: 1 Pair
• performance part: No

seller iodacarb:

• # reviews: 14
• rating: 100.0%

general iodacarb:

• Motorcycle Scooter Parts Accessories > Air Intake Fuel Delivery > Carburetors
• condition: For parts or not working

offer iodacarb:

• sold: 0
• started: May 31, 2026
• options: Ship-to-home
• availability: In Stock
• quantity: 1
• best offers: True

shipping iodacarb:

• carrier: USPS
• class: Standard
• service: USPS Ground Advantage
• cost: $9.35
• type: Calculated
• transit: 5-12 Days

returns iodacarb:

• policy: No Returns

payments iodacarb:

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

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