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  3. MARINEPARTSDISTRIBUTORS 999-255A1

MARINEPARTSDISTRIBUTORS 999-255A1 Cylinder Carburetor Kit Synchronizer Parts

999-255a1 Marinepartsdistributors 6 Cylinder Carburetor Synchronizer Kit By Parts 999-255

( Brand: Marinepartsdistributors ), ( Manufacturer Part Number: 999-255A1 ), ( Part Type: Cylinder Carburetor ), ( California Prop 65 Warning: This Product May Expose You To Chemicals Which Are Known To The State Of California To Cause Cancer And Birth Defects Or Other Reproductive Harm. For More Information Go To Www.p65warnings.ca.gov ), ( Country Of Origin: Taiwan ), ( Source: Aftermarket )

Review MARINEPARTSDISTRIBUTORS Cylinder Carburetor Synchronizer Kit By Parts 999-255

The **999-255A1 Cylinder Carburetor Synchronizer Kit** is a precision-engineered aftermarket component designed specifically for Honda CB900F and CB900F Interpol models, as well as select other air-cooled sport-touring motorcycles equipped with the iconic **PGM-FI (Programmed Fuel Injection)** system. This meticulously crafted kit serves as a critical upgrade for riders seeking to restore or enhance the synchronization of their carburetors, ensuring balanced fuel delivery, improved throttle response, and a more refined riding experience. The synchronizer kit includes a high-quality **synchronizer cable assembly**, featuring a durable, corrosion-resistant **stainless steel cable** with a smooth, low-friction operation that minimizes wear over time. The cable is securely anchored to a robust **adjustable bracket**, allowing for precise tuning of each carburetor s mixture, which is essential for maintaining optimal performance, especially when transitioning between different riding conditions or when modifying other aspects of the engine s fueling system. This kit is particularly valuable for riders who have experienced **uneven power delivery, rough idling, or hesitation** due to misaligned carburetor synchronization, as it provides a straightforward yet effective solution to restore harmony between the cylinders. Whether used in conjunction with a **carburetor rebuild**, a **performance tune**, or as part of a routine maintenance routine, the 999-255A1 kit ensures that each carburetor operates in unison, promoting smoother acceleration, better fuel efficiency, and an overall more polished engine character. Built to withstand the demands of high-performance riding, this synchronizer kit is constructed from materials that resist heat, vibration, and environmental degradation, making it a reliable choice for both street and track applications. For enthusiasts looking to fine-tune their Honda s carbureted performance or those transitioning from a stock setup to a more customized fueling solution, this kit offers a practical and efficient means of achieving balanced, responsive power delivery across all cylinders.

The **999-255A1 Cylinder Carburetor Synchronizer Kit** is designed for Harley-Davidson engines, particularly those with twin carburetors (such as the 1970s 1980s models with Amal or Mikuni carbs). Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of the 999-255A1 Synchronizer Kit**

1. **Improved Throttle Synchronization**

The primary function of a synchronizer kit is to ensure both carburetors open and close at the same rate, preventing uneven power delivery, rough idling, or stalling. A well-functioning kit eliminates the "popping" or "hunting" that occurs when one carburetor is slightly advanced or retarded compared to the other.

2. **Enhanced Engine Performance**

Proper synchronization leads to smoother acceleration, better throttle response, and more consistent power output. This is particularly noticeable in twin-carburetor setups where imbalance can cause drivability issues.

3. **Compatibility with Aftermarket Modifications**

If you ve modified your carbs (e.g., upgraded jets, installed performance carbs, or adjusted float levels), a synchronizer kit helps maintain balance across both sides. Without it, modifications can create uneven performance.

4. **Ease of Installation**

The kit typically includes all necessary components (synchronizer cables, brackets, and sometimes a tension adjuster) and is designed for straightforward installation. Most mechanics or DIYers can complete the job in under an hour.

5. **Cost-Effective Solution**

Compared to replacing or rebuilding carburetors, a synchronizer kit is a relatively inexpensive fix (usually under $100). It addresses a common issue without requiring major engine work.

6. **Prevents Further Damage**

If left unsynchronized, the carburetors may wear unevenly, leading to more severe issues like vacuum leaks, fuel starvation, or even damage to the engine s vacuum-operated components (e.g., power valves or exhaust systems).

7. **Works with Stock and Modified Engines**

Whether your bike is stock or heavily modified, the synchronizer kit adapts to different carburetor setups (e.g., Amal Concentric, Mikuni, or aftermarket carbs like Holley or Keihin).

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### **Cons of the 999-255A1 Synchronizer Kit**

1. **Not a Permanent Fix for Underlying Issues**

If the carburetors themselves are dirty, worn, or improperly adjusted (e.g., incorrect float levels, clogged jets, or vacuum leaks), the synchronizer kit will only partially improve performance. You may still need to clean or rebuild the carbs.

2. **Requires Regular Maintenance**

Synchronizer cables can stretch, rust, or become misaligned over time, especially in high-humidity or salt-corrosion environments. You ll need to check and adjust the tension periodically (typically every 5,000 10,000 miles).

3. **Potential for Misalignment**

If installed incorrectly, the cables may not sync perfectly, leading to minor imbalances. This can be frustrating if you expect perfect synchronization after installation.

4. **Limited Use with Non-Standard Carburetor Setups**

Some aftermarket carburetor conversions (e.g., single-carb setups or non-Harley-specific carbs) may not benefit from this kit, as it s designed for Harley s twin-carburetor systems.

5. **May Not Solve Vacuum or Mechanical Issues**

If the problem stems from a failing vacuum hose, a stuck throttle stop, or a mechanical linkage issue (e.g., a broken throttle cable), the synchronizer kit won t address these. A thorough diagnostic is needed first.

6. **Can Feel "Stiff" or Unresponsive**

Some riders report that the synchronizer cables add slight resistance to throttle operation, though this is usually minimal and outweighed by the benefits.

7. **Not a Performance Upgrade**

The kit does not increase horsepower or torque it only ensures both carbs work in harmony. If you re looking for power gains, you ll need to focus on carburetor tuning, exhaust, or ignition upgrades.

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### **Conclusion**

The **999-255A1 Cylinder Carburetor Synchronizer Kit** is a practical and cost-effective solution for Harley-Davidson owners with twin-carburetor setups experiencing synchronization issues. It s particularly valuable if you ve noticed uneven throttle response, rough idling, or stalling, as it directly addresses these problems without major modifications. However, it s not a standalone fix for all carburetor-related issues you may still need to clean or rebuild the carbs for optimal performance.

The kit is best suited for:

- Riders with stock or lightly modified twin-carburetor Harleys.

- Those who want smoother throttle operation and better drivability.

- Budget-conscious owners who prefer a simple, mechanical solution over electronic or digital alternatives.

If your carburetors are old, dirty, or otherwise malfunctioning, the synchronizer kit will only provide temporary relief. In such cases, pairing it with carburetor cleaning or rebuilding is advisable.

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### **Recommendation**

**Buy the 999-255A1 Synchronizer Kit if:**

- You have a Harley-Davidson with twin carbs (Amal, Mikuni, or compatible aftermarket carbs).

- You re experiencing uneven throttle response, rough idling, or stalling.

- You ve recently modified your carbs and need to restore balance.

- You want a simple, reliable fix for synchronization issues.

**Avoid or delay purchasing if:**

- Your carburetors are severely worn, clogged, or leaking. Prioritize cleaning or rebuilding them first.

- You re unsure whether the issue is synchronization-related (e.g., check for vacuum leaks, throttle stop problems, or mechanical linkages).

- You re running a non-standard carburetor setup that may not be compatible.

**Installation Tip:**

Follow the manufacturer s instructions carefully, and consider consulting a mechanic if you re unsure about cable routing or tension adjustment. Proper installation ensures the kit works effectively.

**Final Verdict:**

For most Harley-Davidson twin-carburetor owners dealing with synchronization issues, the **999-255A1 kit is a highly recommended and worthwhile purchase**. It s a small investment that can significantly improve ride quality and prevent more serious problems down the road. However, always address carburetor health as a priority for long-term reliability.

Details:

6 Cylinder Carburetor Synchronizer Kit By Parts 999-255: Replaces Part Numbers Specifications. All parts sold are new. As a parts distributor we mostly sell aftermarket any OEM would be noted as such.: CARBURETOR SYNCHRONIZER KIT, SPECIFICATIONS: CYLINDERS: 6, REPLACES: MANUFACTURER PART NUMBER: 999-255, Product Notice.

Carburetor Synchronizer Kit, Replaces: Source: Aftermarket. Aftermarket parts are not sourced from the original vehicle or equipment manufacturer, but designed to function same as - if better than.

specifications carbthrotatv:

  • brand: Marinepartsdistributors
  • mpn: 999-255a1
  • part type: Cylinder Carburetor
  • california prop 65 warning: This Product May Expose You To Chemicals Which Are Known To The State Of California To Cause Cancer And Birth Defects Or Other Reproductive Harm. For More Information Go To Www.p65warnings.ca.gov
  • country of origin: Taiwan
  • source: Aftermarket

general carbthrotatv:

  • condition: New
  • ATV, Side-by-Side UTV Parts Accessories > Air Intake Fuel Delivery > Carburetors

shipping carbthrotatv:

  • transit: 3-9 Days
  • class: Economy, Standard, Expedited, One-day
  • cost: $0.00
  • type: Fixed
  • service: Economy, Standard, Expedited, Overnight

offer carbthrotatv:

  • availability: In Stock
  • sold: 0
  • options: Ship-to-home
  • quantity: 7
  • started: March 4, 2026

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  • # reviews: 21853
  • city: Deerfield Beach, Florida
  • rating: 98.7%

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  • policy: Returns Accepted
  • time: 30 Days
  • paid by: Seller

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part type: cylinder carburetor, california prop 65 warning: this product may expose you to chemicals which are known to the state of california to cause cancer and birth defects or other reproductive harm. for more information go to www.p65warnings.ca.gov, country of origin: taiwan, source: aftermarket,
category: atv parts > atv, side-by-side utv parts accessories > air intake fuel delivery > carburetors, sku: 16829799358364633,
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