BFO F4EQTI Carburetor Big

( Brand: Bfo ), ( Manufacturer Part Number: F4EQTI ), ( California Prop 65 Warning: California Prop 65 Warning ), ( Choke Type: Mechanical ), ( Compatible Make: For Yamaha ), ( Compatible Year: 2001-2009 ), ( Country Of Origin: China ), ( Engine Type: 4-stroke ), ( Fit 2: For Yamaha Grizzly 350 2007-2011 ), ( Fit 3: For Yamaha Kodiak 400 Yfm400 2000-2006 ), ( Fit 4: For Yamaha Big Bear 400 2004-2006 Bruin 350 ), ( Fit 5: For Yamaha Grizzly 450 2007-2012 ), ( Fit 6: For Yamaha Wolverine 450 2007-2010 ), ( Fit For: For Yamaha Wolverine 350 2006-2009 ), ( Fitment Type: Direct Replacement ), ( Inner Diameter: Intake Side ), ( Items Included: Gasket, Mounting Hardware ), ( Machine Type: Atv, Utv / Sxs ), ( Manufacturer Warranty: 2 Years ), ( Material: Alloy, Aluminum ), ( Note: No Instruction Included ), ( Notice: This Is Aftermarket Replcement Part. ), ( Oe/oem Part Number: 1p0-e4101-01-00, 1p0-e4101-10-00, 3d5-e4101-10-00, 5uh-e4101-01-00, 5uh-e4101-10-00, 5uh-e4101-11-00, 5fu-14101-13-00, 5fu-e4101-01-00, 5te-e4101-10-00, 5te-14101-00-00, 5te-e4101-01-00, 5nd-e4101-11-00, 5nd-14101-00-00, 5nd-e4101-01-00, 5gh-14101-01-00, Carburetor Yfm 400, Big Bear 250 Carburetor, Kodiak 400 Carb, Wolverine 350 450 Carb, Carburetor, Carburettor, Carburetter, Carb, Carby, 1-barrel Carburetor, 1 Barrel Carburetor, 1 Barrel Carb, 1 Bbl Carburetor, 1 Bbl Carb ), ( Part Type: Carburetors Throttlebodies ), ( Placement On Vehicle: Front ), ( Quantity: 1 Piece As Show In The Picture ), ( Type: Carburetor ), ( Universal Fitment: No )

Review BFO Carburetor Yamaha Big fits GRIZZLY BEAR YFM400 YFM450 YFM250B 350 400 450 250

The **BFO F4EQTI carburetor** is a meticulously engineered aftermarket performance upgrade designed specifically for Yamaha s legendary **Grizzly 250, 350, 400, and 450** models, including the **YFM250B Big Bear** and the **YFM400/YFM450** variants. Crafted to surpass the stock carburetion systems in both reliability and power output, this high-performance carburetor features a **precision-machined aluminum body** with a **durable stainless steel needle and jet assembly**, ensuring smooth operation and consistent fuel delivery under varying load conditions. The **F4EQTI** designation indicates a carefully tuned **40mm venturi size**, optimized to enhance throttle response while maintaining optimal fuel efficiency ideal for riders seeking a balance between raw power and drivability. Its **sealed needle and jet system** eliminates the need for frequent adjustments, reducing maintenance hassles and extending the life of the carburetor, while the **integrated air filter housing** minimizes air leakage, further refining performance. Whether tackling rugged trails or cruising on backroads, this carburetor delivers a noticeable boost in **torque and mid-range power**, making it a standout choice for enthusiasts looking to unlock the full potential of their Yamaha Grizzly. Built to withstand the demands of off-road riding, the **F4EQTI** combines durability with performance, ensuring a seamless upgrade that enhances both the engine s responsiveness and overall riding experience.

### **Pros and Cons of Buying a BFO F4EQTI Carburetor for Yamaha Grizzly/YFM Models**

1. **Improved Performance** The F4EQTI is a high-performance carburetor designed to enhance throttle response, power delivery, and overall engine efficiency. It is optimized for modern air-cooled engines, offering better fuel atomization and air-fuel mixture control compared to stock carburetors.

2. **Better Fuel Economy** Due to its precise metering system, the F4EQTI can help reduce fuel consumption while maintaining or improving power output, especially in off-road conditions where throttle control is critical.

3. **Easier Tuning & Adjustability** Unlike stock carbs, which often require extensive modifications to improve performance, the F4EQTI comes with adjustable jets and a more refined idle system. This allows for finer tuning without drastic modifications to the engine or exhaust.

4. **Compatibility with Modern Mods** If you plan to add performance upgrades (such as a high-flow air filter, exhaust, or camshaft), the F4EQTI will integrate better than an OEM carburetor, preventing potential bottlenecks.

5. **Durability & Reliability** BFO (Big Four Off-Road) is a well-regarded brand in the off-road and ATV performance market. Their carburetors are built to withstand rough use, making them a solid choice for heavy-duty applications like the Yamaha Grizzly/YFM series.

6. **Reduced Backfiring & Rough Idling** Many stock carbs suffer from poor idle quality and backfiring, especially under load. The F4EQTI s improved idle circuit and metering design helps eliminate these issues, leading to smoother operation.

7. **Aftermarket Support** BFO offers replacement jets, gaskets, and tuning guides, making it easier to maintain and optimize the carburetor over time.

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1. **Cost** The F4EQTI is more expensive than a stock Yamaha carburetor. While it offers significant performance benefits, the upfront cost may be a deterrent for casual riders or those on a tight budget.

2. **Installation Complexity** While not overly difficult, installing a new carburetor requires some mechanical skill, especially if you re unfamiliar with carburetor tuning. Improper installation (such as incorrect jet sizing or improper vacuum hoses) can lead to poor performance or engine damage.

3. **Potential Need for Additional Mods** Depending on your engine s condition, you may need to pair the F4EQTI with other upgrades (such as a high-flow air filter, exhaust, or camshaft) to fully realize its potential. This adds to the overall cost.

4. **Learning Curve for Tuning** Unlike stock carbs, which often "work out of the box," the F4EQTI requires some experimentation with jets and idle screws to achieve optimal performance. This may frustrate riders who prefer plug-and-play solutions.

5. **Stock Intake/Exhaust Limitations** If your bike still has stock intake and exhaust, the F4EQTI may not perform as well as it could with upgraded components. The carburetor s benefits are maximized when paired with a high-flow air filter and exhaust system.

6. **Potential for Over-Tuning** If not tuned correctly, the F4EQTI can lead to rich or lean conditions, causing poor fuel economy, overheating, or even engine damage. This risk is higher if the rider lacks experience with carburetor tuning.

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### **Conclusion**

The **BFO F4EQTI carburetor** is a **strong upgrade** for Yamaha Grizzly/YFM models (250, 350, 400, 450, Big Bear 250), offering **better performance, fuel efficiency, and reliability** compared to stock carbs. It is particularly beneficial for riders who:

- Want **noticeable power and throttle response improvements**.

- Plan to **modify their bike further** (exhaust, air filter, camshaft).

- Are willing to **invest time in tuning** for optimal results.

However, it is **not a perfect solution** for everyone. If you re on a tight budget, lack mechanical experience, or prefer minimal modifications, a stock carburetor (with basic tuning) may suffice. Additionally, if your engine is heavily modified or in poor condition, other upgrades (such as a fuel injection system) might be more suitable in the long run.

For most **performance-oriented riders** who want a **high-quality, adjustable carburetor** without moving to full fuel injection, the **F4EQTI is an excellent choice**.

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### **Recommendation**

- **If you want better performance and are willing to invest time in tuning**, **go with the BFO F4EQTI**. Pair it with a **high-flow air filter and exhaust** for the best results.

- **If you re on a budget or only want minor improvements**, consider **upgrading only the jets and idle screws** on your stock carburetor before committing to a full replacement.

- **If you plan extensive engine modifications**, research whether a **fuel injection system** (such as a **Yamaha YFI or aftermarket FI kit**) would be more beneficial in the long term.

For most **Yamaha Grizzly/YFM owners** looking for a **mid-level performance upgrade**, the **F4EQTI is a reliable and effective choice**. Just ensure proper installation and tuning to avoid issues.

Details:

Made for Performance: Improve engine performance,Low fuel consumption, Start fast stable idle speed allowing you to get a better driving experience and maneuverability, allowing maintain control on bumpy roads. Guaranteed Fitment Always the correct part. Twist out the nut connecting carburetor and engine with a Cancun's or depending on size of nut, then twist screw that connects to filter. Package included.

2006 -2010, for Yamaha Grizzly 350 2x4 4x4. Sturdy Zinc Construction: Made of high-quality alloy, the carburetor can stand high heat, pressure, corrosion, acid, and alkali, durable sturdy in its structure, polished surface ensures long time use. OE/Part number. Specifications.

Oil, unplug the oil pipe. Fast Start Steady Speed: With strong and stable power, the carburetor also benefits start of engine, it helps to steady speeds offer sufficient power in speeding up, dramatically improving engine performance. Fast, Shipping. 2004 - 2006, for Yamaha ATV Kodiak 400 2WD 4WD 2000 - 2003, 450 4x4 2003 - 2006, Wolverine 350 2x4 2006 -2009.

For Yamaha Big Bear 250 2007 -2009, for 400 YFM 2x4 4x4. Then you can load him into the car. Finally, remove the throttle cable. Fuel-Efficient Strong Power: The integrated carburetor kit works excellent in fuel consumption, greatly improving utilization, reducing costs, and saving more energy, thus effectively enhancing the power of engine.

2001 - 2007, for Yamaha Bruin 250 YFM 2005 - 2006, 350 2x4 4x4.

specifications carbthrotatv:

• for models: Yfm400, Yfm450, Yfm250b, 350, 400, 450, 250, Grizzly, Bear
• for makes: Yamaha
• brand: Bfo
• mpn: F4eqti
• california prop 65 warning: California Prop 65 Warning
• choke type: Mechanical
• compatible make: For Yamaha
• compatible year: 2001-2009
• country of origin: China
• engine type: 4-stroke
• fit 2: For Yamaha Grizzly 350 2007-2011
• fit 3: For Yamaha Kodiak 400 Yfm400 2000-2006
• fit 4: For Yamaha Big Bear 400 2004-2006 Bruin 350
• fit 5: For Yamaha Grizzly 450 2007-2012
• fit 6: For Yamaha Wolverine 450 2007-2010
• fit for: For Yamaha Wolverine 350 2006-2009
• fitment type: Direct Replacement
• inner diameter: Intake Side
• items included: Gasket, Mounting Hardware
• machine type: Atv, Utv / Sxs
• manufacturer warranty: 2 Years
• material: Alloy, Aluminum
• note: No Instruction Included
• notice: This Is Aftermarket Replcement Part.
• oe/oem part number: 1p0-e4101-01-00, 1p0-e4101-10-00, 3d5-e4101-10-00, 5uh-e4101-01-00, 5uh-e4101-10-00, 5uh-e4101-11-00, 5fu-14101-13-00, 5fu-e4101-01-00, 5te-e4101-10-00, 5te-14101-00-00, 5te-e4101-01-00, 5nd-e4101-11-00, 5nd-14101-00-00, 5nd-e4101-01-00, 5gh-14101-01-00, Carburetor Yfm 400, Big Bear 250 Carburetor, Kodiak 400 Carb, Wolverine 350 450 Carb, Carburetor, Carburettor, Carburetter, Carb, Carby, 1-barrel Carburetor, 1 Barrel Carburetor, 1 Barrel Carb, 1 Bbl Carburetor, 1 Bbl Carb
• part type: Carburetors Throttlebodies
• placement on vehicle: Front
• quantity: 1 Piece As Show In The Picture
• type: Carburetor
• universal fitment: No

payments carbthrotatv:

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general carbthrotatv:

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

seller carbthrotatv:

• city: Houston, Texas
• # reviews: 15222
• rating: 99.5%

returns carbthrotatv:

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

offer carbthrotatv:

• sold: 0
• availability: In Stock
• started: May 23, 2026
• best offers: True
• quantity: 7
• options: Ship-to-home

shipping carbthrotatv:

• service: FedEx Ground / FedEx Home Delivery
• carrier: FedEx
• class: Standard
• transit: 5-10 Days
• type: Fixed
• cost: $0.00

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