BFO YASO6E Carburetor Carb Big Kit 4X4.

( Brand: Bfo ), ( Manufacturer Part Number: YASO6E ), ( 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 Carb Kit Yamaha Big And 4x4. fits BEAR YFM 400 2X4 4X4 2001–2007

The **BFO YASO6E Carburetor Carb Kit** is a meticulously engineered performance upgrade designed specifically for Yamaha s legendary **Big Bear 400 YFM 4x4** models produced between **2001 and 2007**. This high-quality carburetor kit is crafted to enhance throttle response, fuel efficiency, and overall engine performance while maintaining reliability and ease of installation. Engineered with precision, the YASO6E kit replaces the stock carburetor with a more refined and responsive carburetor system, featuring a **high-flow design** that optimizes air-fuel mixture for smoother acceleration and better power delivery across the RPM range. The kit includes a **durable brass body**, ensuring longevity and resistance to corrosion, paired with a **precision-machined throttle body** that reduces internal friction for a more linear and responsive feel. Whether you re tackling rough terrain, towing heavy loads, or simply seeking improved daily driving performance, this carb kit delivers a noticeable upgrade in engine efficiency and power output. Backed by BFO s reputation for quality and performance, the YASO6E carburetor kit is an ideal choice for off-road enthusiasts and Yamaha owners looking to maximize their Big Bear s potential without compromising on durability or ease of maintenance.

The **BFO Yaso6E Carburetor Kit** is a popular aftermarket upgrade for the Yamaha Big Bear 400 YFM 4x4 (2001 2007) models, designed to improve performance, fuel efficiency, and throttle response. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

---

### **Pros of the BFO Yaso6E Carb Kit**

1. **Performance Gains**

The Yaso6E is a high-performance carburetor engineered for better air-fuel mixture control, resulting in increased horsepower and torque. Many users report noticeable acceleration and smoother power delivery, especially under load. The kit includes a new **intake manifold**, which helps optimize airflow into the engine.

2. **Improved Fuel Efficiency**

Unlike stock carburetors, which often run rich (wasting fuel), the Yaso6E is tuned for a leaner but more efficient mixture. This can lead to better fuel economy, particularly in steady-state driving conditions.

3. **Better Throttle Response**

The Yaso6E features a more responsive **butterfly valve** and improved idle mixture, reducing hesitation and improving overall drivability. This is particularly beneficial for off-road use where quick throttle adjustments are necessary.

4. **Durability and Reliability**

BFO is a well-regarded brand in the off-road and ATV performance market. The Yaso6E is built with durable materials and includes a **new choke system**, reducing wear on the stock components. Many users report fewer carburetor-related issues over time.

5. **Easier Installation**

The kit comes with detailed instructions, and while it requires some mechanical skill, it is generally considered a straightforward upgrade compared to more complex engine modifications. The new manifold also eliminates the need for gaskets or seals that may degrade over time.

6. **Compatibility with Stock Engine**

The Yaso6E is designed specifically for the Yamaha Big Bear 400, meaning it integrates well with the stock engine without requiring major modifications. This makes it a plug-and-play option for those looking to enhance performance without a full rebuild.

7. **Reduced Carbon Buildup**

A properly tuned carburetor like the Yaso6E helps prevent excessive carbon deposits on intake valves and pistons, which can occur with a rich-running stock setup. This contributes to longer engine life.

8. **Off-Road Suitability**

For ATVs used in rough terrain, the Yaso6E s improved airflow and mixture control can help maintain power in high-RPM situations, such as climbing steep hills or pulling heavy loads.

---

### **Cons of the BFO Yaso6E Carb Kit**

1. **Cost**

The Yaso6E kit is more expensive than a stock carburetor or even some basic aftermarket alternatives. Prices typically range between **$200 $300**, depending on the retailer and whether additional components (like a new air filter or fuel line) are included. This can be a significant investment for riders on a tight budget.

2. **Learning Curve for Tuning**

While the carburetor itself is a direct replacement, achieving optimal performance requires proper **carburetor tuning**. This may involve adjusting the **pilot jet, main jet, and idle mixture screw**, which can be tricky without experience. Many users find they need to experiment with settings to find the best balance between power and reliability.

3. **Potential for Over-Running the Engine**

If not tuned correctly, the Yaso6E can run too lean, leading to **detonation, overheating, or even engine damage**, especially in high-stress conditions. This risk is higher if the engine is not in good condition or if other components (like the ignition or exhaust) are not compatible.

4. **Requires Supporting Modifications**

- A **high-flow air filter** (e.g., K&N or BFO)

- A **performance exhaust system** (to handle increased airflow)

- **Tuned ignition** (if using a high-performance cam or other engine mods)

Without these, the gains may be modest, and the engine could struggle with excess air.

5. **Stock Fuel System Limitations**

The Yamaha Big Bear 400 s stock fuel system (including the fuel pump and lines) may not be adequate for sustained high-performance use. If the fuel system is weak or clogged, the Yaso6E may not perform as expected, leading to **rich or lean conditions** depending on the issue.

6. **Potential for Voiding Warranty**

If the ATV is still under manufacturer warranty, installing an aftermarket carburetor kit may void coverage, especially if the engine is damaged due to improper tuning or installation.

7. **Not a "Set and Forget" Solution**

- Cleaning the carburetor periodically

- Checking and adjusting the idle mixture

- Ensuring the fuel system is clean and functional

Ignoring these steps can lead to poor performance or failure.

8. **Mixed User Experiences**

While many users report significant improvements, others experience **minimal gains** or even **regress in performance** if the carburetor is not properly tuned or if other engine components are worn. This variability means results can be inconsistent.

---

### **Conclusion**

The **BFO Yaso6E Carburetor Kit** is one of the best aftermarket options for upgrading the Yamaha Big Bear 400 s carburetor, offering **noticeable performance gains, better fuel efficiency, and improved throttle response**. It is particularly well-suited for riders who want a **direct, high-quality upgrade** without a full engine rebuild. However, it is not a "magic bullet" it requires **proper tuning, supporting modifications, and maintenance** to unlock its full potential.

For riders who are **mechanically inclined, willing to invest time in tuning, and have a budget for performance upgrades**, the Yaso6E is an excellent choice. Those who prioritize **simplicity, cost-effectiveness, or minimal maintenance** may find it overkill and could consider alternatives like **carburetor cleaning kits, performance air filters, or even a simple jet upgrade** before committing to a full carb kit.

---

### **Recommendation**

- You are looking for a **significant performance boost** in power, throttle response, and fuel efficiency.

- You are willing to **invest time in tuning** and potentially pair it with other mods (e.g., air filter, exhaust, or ignition).

- Your engine is in **good condition**, and you plan to maintain it properly.

- You want a **durable, high-quality upgrade** that will last for years with proper care.

- You are on a **tight budget** and cannot afford additional supporting mods.

- You are **not comfortable with carburetor tuning** or mechanical adjustments.

- Your ATV s **fuel system or engine is worn**, as the Yaso6E may not perform well without addressing these issues first.

- You prefer a **low-maintenance, plug-and-play solution** rather than a performance-focused upgrade.

- If you want **easier gains**, start with a **carburetor cleaning and tuning service** before committing to a full kit.

- For a **mid-range option**, consider a **performance carburetor from a different brand** (e.g., Walbro or Keihin) if the Yaso6E is too expensive.

- If your primary goal is **off-road power**, ensure the rest of your engine (ignition, exhaust, and fuel system) is compatible to avoid bottlenecks.

Ultimately, the Yaso6E is one of the **best carburetor upgrades** for the Big Bear 400, but it demands **attention to detail and proper setup** to justify its cost. For the right rider, it can transform the ATV s performance, but it is not a solution for those seeking a simple, hassle-free improvement.

Details:

Please follow our return. Then you can load him into the car. Manufacturer. Always the correct part.

PRODUCT DISPLAY Carburetor Carb Kit for Yamaha BIG BEAR 400 YFM 2X4 4X4. Guaranteed Fitment. 2001 - 2007. Quick, Simple.

Finally, remove the throttle cable. For Yamaha Big Bear 250 2007 -2009, for 400 YFM 2X4 4X4. Package included. Oil, unplug the oil pipe.

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. Specifications. 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. OE/Part number.

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. 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. 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: Yfm, 400, 2x4, 4x4, Bear
• for makes: Yamaha
• for years: 2001-2007
• brand: Bfo
• mpn: Yaso6e
• 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

shipping carbthrotatv:

• carrier: FedEx
• type: Fixed
• transit: 3-7 Days
• class: Standard
• cost: $0.00
• service: FedEx Ground / FedEx Home Delivery

seller carbthrotatv:

• rating: 99.5%
• # reviews: 1901
• city: Houston, Texas

general carbthrotatv:

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

payments carbthrotatv:

• credit card: Visa
• other
• wallet: Paypal

offer carbthrotatv:

• options: Ship-to-home
• quantity: 4
• availability: In Stock
• sold: 0
• started: May 6, 2026
• best offers: True

returns carbthrotatv:

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

Bfo YASO6E Is Similar To:

• Pqu12c Bfo Carburetor For Arctic Cat Atv Quad Carb (38.2% similar) For arctic cat DVX400 2004 -2007. Not fit for arctic cat 4X4 2006 , 400VP manual shift model's. Our carburetor has the absolute vacuum pipe, work properly. For arctic cat: 3470-023 3470-031 3470-035. New carburetor fit for arctic cat atv 350 366 400 carb 0470-737 2008 -2016 2017 . The Bfo PQU12C...(December 17th, 2021)
• I3lmeg Bfo Carburetor Carb For Polaris Scrambler Awd (46.6% similar) Carburetor fits for Polaris sportsman 500 4X4 2001 -2005 2010 2011 2012 . For Polaris atv. Scrambler 500 2007 . Scrambler 400 1999 . 1x carburetor for Polaris. Big boss 500 6X6 1998 -2002. Explorer 500 4X4 1997 . The Bfo I3LMEG is in new condition...(December 23rd, 2021)
• Vnd0xi Bfo Carburetor For Polaris Scrambler (37.1% similar) Carburetor fits for Polaris sportsman 500 4X4 2001 -2005 2010 2011 2012 . For Polaris atv. Scrambler 400 1999 . Scrambler 500 2007 . Magnum 4X4 1995 -1998. Carburetor replace for arctic cat 400 500 2X4 4X4 2002 2003 atv 0470-504 carb. The Bfo VND0XI is in new condition...(December 24th, 2021)
• Lxa8r6 Bfo Carburetor For Polaris Sportsman Duse Ho Rse (38.2% similar) Carburetor fits for Polaris sportsman 500 4X4 2001 -2005 2010 2011 2012 . Hawk eye 400 ho 2012 - 2014 . For Polaris atv. Sportsman 400 ho 4X4 2012 - 2014 . Sportsman 400 ho 4X4 SE 2014 . Sportsman 500 4X4 non-ho 1999 -2004. The Bfo LXA8R6 is in new condition...(December 25th, 2021)
• 837l1b Bfo Carburetor Fits For Honda Trx Sportrax Atv Carb Assembly (36.5% similar) For Honda TRX400 Sportrax 2001 -2006. For Honda TRX400 Sportrax 2007 -2015. 1 x carburetor. Carburetor carb kit for Honda ACT 350 x 350X 1985 -1986 with throttle base cover. Carburetor carb for Honda CRF250R 2004 -05 CRF250X 2004 -13 RMZ250 2004 -09 WR250. The Bfo 837L1B is in new condition...(January 3rd, 2022)
• M4terp Bfo Carburetor Carb Fit For Arctic Cat Atv Red Green (47.1% similar) New carburetor carb for arctic cat 250 300 2X4 4X4 2001 - 2005 atv 0470-448. For arctic cat atv 250 2X4 green 2002 - 2005 . For arctic cat atv 250 2X4 red 2002 - 2005 . For arctic cat atv 300 2X4 red 2001 - 2003 . The Bfo M4TERP is in new condition...(January 5th, 2022)
• 0ghn63 Bfo New Carburetor For Suzuki Quadrunner (39.1% similar) Carburetor carb for Suzuki quad runner LT160 LT-F160 1991 -2001 13200-02C03. For Suzuki quad runner LT160 2002 -2003. For Suzuki quad runner LT160E 1989 -1992. For Suzuki quad runner LT-F160 1991 -2001. Carburetor for Suzuki ALT125 LT125 1983 -1987 185 quad runner 13200-18912. The Bfo 0GHN63 is...(January 7th, 2022)
• 5qbr4g Bfo Carburetor Carb Fits For Arctic Cat Atv Red Green (46.8% similar) New carburetor carb for arctic cat 250 300 2X4 4X4 2001 -2005 atv. For arctic cat atv 250 2X4 green 2002 . For arctic cat atv 250 2X4 red 2002 . For arctic cat atv 250 2X4 green 2003 . For arctic cat atv 250 2X4 red 2003 . The Bfo 5QBR4G is in new condition...(January 12th, 2022)
• Rmzd9s Bfo Carburetor Carb Fit For Yamaha Grizzly Atv Raptor (53.9% similar) New carburetor for 2001 -2005 for yamaha for raptor 660 660R YFM660 yfm 660R carb. For yamaha for raptor 660 2001 -2005. 1x carburetor. Drive belt for yamaha atv YFM700 grizzly 700 fi 4WD 2007 -2020 B16-E7641-00-00. The Bfo RMZD9S is in new condition...(January 13th, 2022)
• Dixq6g Bfo New Carburetor Fit For Honda Atv Foreman Rancher Fe (39.2% similar) For Honda TRX350 rancher 350 2000 -2006. For Honda TRX350 footrace 1986 -1987. For Honda most year of Honda ACT 250, TRX250 TRX300 TRX350 TRX400 TRX450 etc. For Honda TRX350TE rancher 2000 -2006. For Honda TRX400FW foreman 1995 -2005. The Bfo DIXQ6G is in new condition...(January 14th, 2022)
• N8gct1 Bfo Carburettor Carb Fit Yamaha Rhino (51.2% similar) Fit for yamaha rhino 660 carburetor 2004 2005 2006 2007 YXR660. For yamaha rhino 660 2004 - 2007 . For yamaha grizzly 600 1998 -2001. For yamaha grizzly 660 2002 -2008. Ignition spark plug CID box 1995 for kodiak for yamaha YFM400FW 4GB-85540-00-00. The Bfo N8GCT1 is in new condition...(January 15th, 2022)