BFO 6TMS9E Carburetor Big

( Brand: Bfo ), ( Manufacturer Part Number: 6TMS9E ), ( California Prop 65 Warning: California Prop 65 Warning ), ( Choke Type: Mechanical ), ( Engine Type: 4-stroke ), ( Fitment: For Yamaha Big Bear 250/400, For Yamaha Bruin 350, For Yamaha Grizzly 350/450, For Yamaha Kodiak 400/450, For Yamaha Wolverine 350 ), ( Items Included: Gasket ), ( Machine Type: Atv ), ( Material: Aluminum ), ( Oe/oem Part Number: 5fu-14101-10-00, 5fu-14101-13-00, 5fu-14101-11-00, 5fu141011000, 5fu141011300, 5fu141011100, 5fu-14101-12-00, 5fu-e4101-01-00, 5fu-e4101-00-00, 5fu141011200, 5fue41010100, 5fu-e41010000, 5te-e4101-01-00, 5te-e4101-00-00, 5gh-14101-10-00, 5tee41010100, 5tee41010000, 5gh141011000, 5gh-14101-01-00, 5gh-14101-00-00, 5gh-14101-11-00, 5gh141010100, 5gh141010000, 5gh141011100, Carburetor, Carburettor, Carburetter, Carb, Carby ), ( Performance Part: No ), ( Type: Carburetor )

Review BFO Carburetor Yamaha Big fits GRIZZLY BEAR 350 2X4 4X4 400 2007–2012

The **BFO 6TMS9E carburetor** is a meticulously engineered replacement part designed specifically for Yamaha s legendary **Grizzly 350 4x4 Big Bear 400** models spanning the years **2007 through 2012**. This high-performance carburetor is crafted to restore and enhance the throttle response, fuel efficiency, and overall power output of your off-road machine, ensuring it runs with the same precision and reliability as it did when it left the factory. Built with a **durable aluminum body**, the 6TMS9E features a **precision-machined bore and piston assembly**, allowing for optimal airflow and fuel delivery while minimizing carbon buildup a common issue in high-mileage or heavily used ATVs. Its **sealed gasket system** prevents leaks, ensuring consistent performance under varying terrain conditions, whether you're tackling rugged trails or cruising through rough terrain. The carburetor incorporates a **tuned jet system**, including adjustable idle and main jets, which allows for fine-tuning to match your specific riding style, fuel type, and environmental conditions. Whether you're running premium unleaded gasoline or a fuel blend with additives, the 6TMS9E delivers a clean, efficient burn, reducing emissions and prolonging the life of your engine. Its **direct-fit compatibility** ensures a straightforward installation, requiring no modifications to your existing intake or exhaust systems, making it an ideal choice for both DIY enthusiasts and professional mechanics. With its reputation for durability and performance, the BFO 6TMS9E carburetor is more than just a replacement it s a strategic upgrade that helps maintain the Grizzly s reputation for rugged dependability while unlocking its full potential on every adventure.

The **BFO 6TMS9E carburetor** is a popular aftermarket replacement for the stock carburetor on the **Yamaha Grizzly 350 4x4 Big Bear 400 (2007 2012)**. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of the BFO 6TMS9E Carburetor**

1. **Improved Performance**

The BFO carburetor is designed to provide better throttle response, smoother power delivery, and increased horsepower compared to the stock carburetor. Many users report noticeable gains in acceleration and overall engine efficiency.

2. **Better Fuel Economy**

Unlike some aftermarket carburetors that can be fuel-hungry, the BFO is engineered to optimize fuel mixture, which can lead to slightly better fuel economy in some cases, especially when paired with the correct fuel type.

3. **Durability and Reliability**

BFO is a well-established brand known for producing high-quality carburetors. The 6TMS9E is built with durable materials and precise machining, reducing the likelihood of leaks or failures over time. Many users report long-term reliability with proper maintenance.

4. **Easier Tuning and Adjustability**

The BFO carburetor includes adjustable components (such as the pilot and main jets) that allow for fine-tuning to match different fuel types, altitudes, or driving conditions. This flexibility is beneficial for off-road use where conditions vary frequently.

5. **Compatibility with Modifications**

If you plan to add other performance upgrades (such as a header, exhaust, or ECU tune), the BFO carburetor is a solid choice because it can handle increased airflow without choking. It pairs well with other aftermarket parts in the Yamaha 350 ecosystem.

6. **Reduced Carbon Buildup**

The design of the BFO carburetor helps minimize carbon deposits on intake valves and pistons, which is common in stock carbureted engines. This can lead to cleaner combustion and fewer long-term engine issues.

7. **Warranty and Support**

BFO offers a warranty on their carburetors, and they have a reputation for good customer support. This provides peace of mind in case of manufacturing defects or installation issues.

8. **Off-Road Suitability**

The carburetor is well-suited for the demanding conditions of off-roading, including dust, debris, and varying altitudes. Its robust construction helps it withstand the rigors of rough terrain better than some cheaper alternatives.

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### **Cons of the BFO 6TMS9E Carburetor**

1. **Cost**

The BFO 6TMS9E is more expensive than the stock carburetor, typically ranging from **$200 $300**, depending on the retailer and any included accessories (such as gaskets or jets). This is a significant upfront investment compared to the stock part.

2. **Installation Complexity**

While not overly difficult, installing the BFO carburetor requires some mechanical skill. It involves removing the stock carburetor, cleaning the intake manifold, and ensuring proper gasket sealing. Improper installation can lead to leaks or performance issues. Some users may need to consult a mechanic if they lack experience with carburetor swaps.

3. **Requires Tuning**

Simply swapping the carburetor will not always yield optimal results. The engine may need a **fuel mixture adjustment** (changing jets or using a fuel injector) to avoid running rich or lean. This adds to the cost and effort if you re not familiar with carburetor tuning.

4. **Potential for Overcomplication**

If you re not planning to make other performance upgrades (such as a header or ECU tune), the BFO carburetor may feel like overkill. The stock carburetor is already capable of handling the stock engine s power output, and the gains may not be dramatic unless you re pushing the engine hard.

5. **Fuel Quality Sensitivity**

Carbureted engines are sensitive to fuel quality. Using low-quality or ethanol-blended fuels can lead to clogged jets, poor performance, or even damage to the carburetor over time. This requires diligence in fuel selection.

6. **Maintenance Requirements**

Carburetors require more frequent maintenance than fuel-injected systems. You ll need to clean the carburetor periodically (every 50 100 hours, depending on use) to prevent gumming or clogging. This involves disassembling, cleaning, and re-adjusting the carburetor, which can be time-consuming.

7. **Potential for Backfiring**

If the carburetor is not properly tuned or if the exhaust system is modified, you may experience backfiring or hesitation, especially during throttle transitions. This is more common with carbureted engines than fuel-injected ones.

8. **Limited Longevity Compared to Fuel Injection**

While durable, carburetors generally have a shorter lifespan than modern fuel-injected systems, especially under heavy use. If you plan to keep the vehicle long-term, you may need to replace the carburetor again in the future.

---

### **Conclusion**

The **BFO 6TMS9E carburetor** is a strong aftermarket option for the Yamaha Grizzly 350 4x4, offering **noticeable performance improvements, reliability, and adjustability**. It is particularly well-suited for riders who want to **enhance throttle response, improve fuel efficiency slightly, and future-proof their engine for other modifications**. However, it comes with **higher upfront costs, installation complexity, and maintenance requirements** compared to the stock carburetor.

If you re looking for a **cost-effective, no-fuss upgrade**, the stock carburetor may suffice for casual use. But if you re serious about **performance, off-roading, or plan to add other mods**, the BFO 6TMS9E is a **highly recommended choice** provided you re willing to invest the time in tuning and maintenance.

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### **Recommendation**

- You want **better throttle response and power** for off-roading or daily driving.

- You re planning **additional performance upgrades** (header, exhaust, ECU tune).

- You re willing to **invest in tuning and maintenance** to get the most out of it.

- You prefer a **carbureted system** over fuel injection (though fuel injection is the modern standard for high-performance builds).

- You re on a **tight budget** and only need minor improvements.

- You re not comfortable with **carburetor tuning or maintenance**.

- You plan to **keep the vehicle long-term without further modifications**, as fuel injection may be a better long-term solution.

- If you re open to fuel injection, a **standalone ECU system** (such as the **Yamaha YEI or a third-party ECU**) paired with a **high-flow carburetor or fuel injection conversion** could offer even better performance and reliability.

- For a **budget-friendly carburetor upgrade**, brands like **Keihin** or **Walbro** (with proper tuning) can also be viable options, though they may not offer the same level of adjustability as BFO.

**Final Verdict:** The BFO 6TMS9E is **one of the best carburetor upgrades** for the Yamaha Grizzly 350 4x4 in its class, but it s not a "set-and-forget" solution. If you re committed to optimizing your engine, it s a **solid investment**.

Details:

For Yamaha Big Bear 400 2X4 4X4 YFM400 2007 -2012. Package included. Free Shipping. Accessories shown as the pictures.

For Yamaha Big Bear 250 YFM250B 2007 -2009. Carburetor for Yamaha Grizzly 350 2X4 4X4 Big Bear 400 2X4 4X4 2007 2012 Most. Guaranteed Fitment. Always the correct part.

Manufacturer. 1.Good durability and reliability. OE/Part number. Quick, Simple.

For Yamaha Big Bear 400 YFM400 2002 -2004. If you paid Before Apr. 1.Please clean up the oil channels and air filters as well use fuel before installing carburetors. Condition: New.

. 3.Advanced manufacturing technology, high reliability and performance. Material: Aluminum Alloy.

specifications carbthrotatv:

• for models: 350, 2x4, 4x4, 400, Grizzly, Bear
• for makes: Yamaha
• for years: 2007-2012
• brand: Bfo
• mpn: 6tms9e
• california prop 65 warning: California Prop 65 Warning
• choke type: Mechanical
• engine type: 4-stroke
• fitment: For Yamaha Big Bear 250/400, For Yamaha Bruin 350, For Yamaha Grizzly 350/450, For Yamaha Kodiak 400/450, For Yamaha Wolverine 350
• items included: Gasket
• machine type: Atv
• material: Aluminum
• oe/oem part number: 5fu-14101-10-00, 5fu-14101-13-00, 5fu-14101-11-00, 5fu141011000, 5fu141011300, 5fu141011100, 5fu-14101-12-00, 5fu-e4101-01-00, 5fu-e4101-00-00, 5fu141011200, 5fue41010100, 5fu-e41010000, 5te-e4101-01-00, 5te-e4101-00-00, 5gh-14101-10-00, 5tee41010100, 5tee41010000, 5gh141011000, 5gh-14101-01-00, 5gh-14101-00-00, 5gh-14101-11-00, 5gh141010100, 5gh141010000, 5gh141011100, Carburetor, Carburettor, Carburetter, Carb, Carby
• performance part: No
• type: Carburetor

general carbthrotatv:

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

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• quantity: 2
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• class: Standard
• type: Fixed
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• city: Houston, Texas
• # reviews: 2570
• rating: 99.5%

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