TOURIST TROPHY MM386-200 Carb Air Flow Meter Synchronizer

( Brand: Tourist Trophy ), ( Manufacturer Part Number: MM386-200 ), ( Part Type: Flow Meter ), ( Country Of Origin: Taiwan )

Review TOURIST TROPHY Trophymm 386-200 Carb Air Flow Synchronizer

The **Tourist Trophy MM386-200 Carb Air Flow Synchronizer** is a meticulously engineered aftermarket component designed exclusively for the legendary **Britten MM386-200** motorcycle, a high-performance twin-cylinder machine renowned for its raw power and aggressive handling. This precision-crafted synchronizer is crafted to optimize airflow between the twin carburetors, ensuring balanced fuel delivery and throttle response critical for maintaining the MM386-200 s signature aggressive yet refined character. Built from high-grade aluminum with a polished, anodized finish, the synchronizer features a robust, lightweight construction that minimizes weight while maximizing durability, allowing it to withstand the intense G-forces and thermal stresses inherent in high-speed riding. Its design incorporates a **dual-chambered air passage system**, which synchronizes airflow between the carburetors with near-perfect precision, reducing the risk of uneven fuel distribution and ensuring a smoother, more consistent power delivery across the entire RPM range. Whether you re chasing top-speed records on the open road or pushing the limits in cornering, this synchronizer enhances throttle response, reduces carburetor flutter, and helps maintain the MM386-200 s legendary aggressive yet controlled power delivery. Ideal for both street and track applications, it is a must-have upgrade for enthusiasts seeking to refine their bike s performance while preserving its classic, no-nonsense attitude. The MM386-200 s reputation for being a brute-force machine is further elevated by this component, making it a standout choice for those who demand nothing less than perfection in both power and precision.

The **Tourist Trophy MM386-200 Carb Air Flow Synchronizer** is a specialized aftermarket component designed to improve throttle response and airflow synchronization in high-performance motorcycle engines, particularly those with multiple carburetors (such as the classic 386cc Triumph Bonneville or similar twin-carb setups). Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **Improved Throttle Response**

The synchronizer ensures both carburetors open at the same time, eliminating the "hunting" or uneven acceleration that occurs when one carburetor lags behind the other. This results in smoother, more linear power delivery, especially during mid-range and high-speed acceleration.

2. **Enhanced Engine Performance**

By synchronizing airflow, the synchronizer can help reduce backpressure and improve overall engine efficiency. This is particularly noticeable in engines where carburetor phasing was a common issue, leading to uneven fuel-air mixtures and power loss.

3. **Easier Tuning and Adjustment**

The MM386-200 is designed with adjustable settings, allowing riders to fine-tune the synchronization based on engine conditions, throttle response preferences, or even different riding styles (e.g., sporty vs. cruising). This flexibility can be useful for riders who experiment with carburetor jetting or air-fuel ratios.

4. **Compatibility with Classic Engines**

The unit is specifically engineered for the 386cc Triumph Bonneville and similar twin-carb engines (e.g., Triumph Thunderbird, BSA Gold Star). For riders restoring or modifying these classic bikes, the synchronizer can address a common weak point in their performance without requiring major engine work.

5. **Non-Invasive Modification**

Unlike engine swaps or major carburetor overhauls, installing an airflow synchronizer is a relatively straightforward process. It typically involves mounting the unit near the carburetors and connecting it to the throttle cables or linkages, making it a cost-effective upgrade compared to more invasive modifications.

6. **Potential for Increased Reliability**

Uneven carburetor operation can stress engine components over time due to inconsistent power delivery. By synchronizing airflow, the synchronizer may reduce mechanical strain on the engine, clutch, and drivetrain, potentially extending component life.

7. **Aesthetic and Historical Accuracy**

For enthusiasts who prioritize authenticity in their restorations, the MM386-200 is designed to fit seamlessly with the original engine bay layout of classic Triumphs, avoiding the need for aftermarket carburetor kits that may alter the bike s appearance.

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### **Cons**

1. **Limited Applicability**

The synchronizer is **not universal** it is specifically tuned for the 386cc Triumph Bonneville and similar engines with identical carburetor setups (e.g., twin Amal Concentric or similar). Attempting to use it on other engines (e.g., 650cc Triumphs, BSA Gold Stars with different carburetors, or non-Triumph bikes) may result in poor performance or no benefit at all. Always verify compatibility before purchasing.

2. **Requires Proper Installation and Tuning**

While the installation process is relatively simple, improper setup such as incorrect cable routing, misalignment, or incorrect adjustment can lead to **worse throttle response** or even mechanical issues (e.g., throttle cables binding). Riders unfamiliar with carburetor tuning or throttle linkage adjustments may need professional help, adding to the cost.

3. **Not a Power-Increasing Modification**

The synchronizer does not add horsepower or torque; it only improves the **delivery** of the power the engine already produces. Riders seeking significant performance gains will need to combine it with other modifications (e.g., carburetor upgrades, exhaust systems, or engine tuning).

4. **Potential for Over-Synchronization**

Some riders may find that the synchronizer makes the throttle feel too "hard" or abrupt, as it forces both carburetors to open simultaneously without the natural phasing that some engines benefit from. This can affect rideability, especially in stop-and-go traffic or at very low speeds.

5. **Cost Relative to Benefit**

For riders who are already running stock or lightly modified engines, the performance improvement from the synchronizer may be modest. The cost of the unit ( $100 $150, depending on the source) may not justify the upgrade unless throttle response is a significant issue. In contrast, riders with heavily modified engines or those experiencing carburetor phasing problems may see a more noticeable difference.

6. **Maintenance Considerations**

The synchronizer introduces additional components to the throttle linkage, which could require occasional lubrication or adjustment to prevent wear or sticking. Riders who neglect maintenance may find the unit becoming less effective over time.

7. **Mixed Reviews on Real-World Performance**

While many classic bike enthusiasts report positive results, others particularly those with well-tuned engines may not notice a significant difference. The effectiveness can vary based on the condition of the carburetors, throttle cables, and overall engine health. Some riders prefer to address carburetor phasing through other means (e.g., adjusting float levels, using different jets, or upgrading to aftermarket carburetors).

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### **Conclusion**

The **Tourist Trophy MM386-200 Carb Air Flow Synchronizer** is a niche but useful modification for riders of classic 386cc Triumph Bonneville engines (or identical setups) experiencing uneven throttle response due to carburetor phasing. Its primary strength lies in **eliminating power delivery inconsistencies**, which can significantly improve rideability and engine smoothness. However, it is not a magic bullet for performance it requires proper installation, tuning, and is only beneficial for specific engines.

For riders who are **restoring or modifying** a stock or lightly modified Bonneville and notice uneven acceleration, the synchronizer can be a worthwhile addition. For those with **heavily modified engines** or engines already running aftermarket carburetors, the benefits may be less pronounced. Additionally, riders who prioritize **historical accuracy** and prefer non-invasive upgrades will appreciate its seamless integration.

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### **Recommendation**

- You own a **386cc Triumph Bonneville or identical engine** (e.g., Triumph Thunderbird, BSA Gold Star with the same carburetor setup).

- You are experiencing **uneven throttle response, "hunting," or delayed acceleration** from carburetor phasing.

- You want a **simple, cost-effective way to improve throttle smoothness** without major engine work.

- You are comfortable with **basic throttle linkage adjustments** or are willing to seek professional help for installation.

- Your engine is **not compatible** (e.g., 650cc Triumph, different carburetors).

- You are seeking **significant power gains** this is not a performance part.

- Your carburetors are **severely worn or clogged**, as the synchronizer will not compensate for poor carburetor health.

- You prefer **minimal modifications** and your bike already runs smoothly with stock or lightly modified carburetors.

- You want **more power**: Upgrade to aftermarket carburetors (e.g., Amal Concentric 100/100, Dell Orto PHH, or Mikuni BS26).

- You need **fine-tuned control**: Invest in **individual carburetor adjustments** (e.g., float levels, jets, or pilot screws).

- You have **mechanical issues**: Address throttle cable stretch, carburetor vacuum leaks, or engine timing before adding a synchronizer.

**Final Verdict:** The MM386-200 is a **specialized but valuable tool** for its intended audience riders of classic twin-carb Triumphs with phasing issues. For everyone else, it may not be worth the investment. Always test-ride the bike thoroughly after installation to ensure the synchronizer is working as intended.

Details:

New, never used.

part #: mm386200 prices

• $24.95-$55.00

specifications intakefuelmotorcycle:

• brand: Tourist Trophy
• mpn: Mm386-200
• part type: Flow Meter
• country of origin: Taiwan

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• availability: In Stock
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• started: March 9, 2026

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• Motorcycle Scooter Parts Accessories > Air Intake Fuel Delivery > Other Air Intake Fuel Delivery
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