BFO D4R90G Carburetor Big

( Brand: Bfo ), ( Manufacturer Part Number: D4R90G ), ( 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 Assembly Yamaha Big fits BEAR YFM400 400 2000–2012

The **BFO D4R90G Carburetor** is a meticulously engineered, high-performance replacement for the stock carburetor found on Yamaha s legendary **Big Bear 400 (YFM400)** models, spanning production years from **2000 to 2012**. Designed with precision and built to exceed OEM standards, this aftermarket carburetor delivers a seamless blend of reliability, throttle response, and power output, making it an ideal choice for riders seeking enhanced performance without sacrificing durability. The **D4R90G** features a **40mm bore**, optimized for improved airflow and fuel efficiency, ensuring a cleaner burn and reduced carbon buildup critical for maintaining engine longevity. Its **aluminum body construction** is reinforced with high-grade materials, offering superior heat dissipation and resistance to warping, even under sustained high-RPM conditions. The carburetor incorporates a **precision-machined pilot jet and main jet system**, allowing for fine-tuned adjustments to suit various fuel types, from standard pump gas to higher-octane blends, while minimizing vapor lock and ensuring consistent performance across different altitudes and temperatures. A standout feature is the **upgraded throttle body**, which reduces internal friction and improves throttle response, making acceleration smoother and more responsive, particularly in aggressive riding scenarios. The **BFO D4R90G** also includes a **sealed gasket kit** and **O-ring assembly**, ensuring a leak-proof fit and preventing fuel leaks or air infiltration that could compromise performance. Whether you're modifying your Big Bear for track use, long-distance touring, or simply upgrading for better daily drivability, this carburetor delivers a noticeable boost in horsepower and torque while maintaining the stock engine s reliability. Backed by BFO s reputation for quality and supported by detailed installation instructions, this carburetor is a straightforward yet impactful upgrade for any Yamaha YFM400 owner looking to unlock the full potential of their classic off-road machine.

### Pros and Cons of Buying a BFO D4R90G Carburetor for a Yamaha Big Bear 400 (YFM400, 2000 2012)

1. **Performance Improvement** The D4R90G is a high-performance carburetor designed for better throttle response, smoother power delivery, and improved acceleration compared to the stock carburetor. It is optimized for higher RPM performance, which can enhance the Big Bear s power output, especially in off-road or aggressive riding scenarios.

2. **Durability and Reliability** BFO (Big Four Off-Road) is a well-regarded brand in the off-road and ATV/motorcycle performance market. Their carburetors are built to withstand the demands of heavy use, including dust, debris, and rough terrain, which is common for a Big Bear 400.

3. **Easier Maintenance and Tuning** The D4R90G is designed with a more straightforward setup than some stock carburetors. It often includes features like a more accessible jet system, allowing for easier adjustments to fuel mixture (leaner or richer) without extensive disassembly. This can be beneficial for riders who like to fine-tune their engine for specific conditions.

4. **Compatibility with Aftermarket Upgrades** If you plan to add other performance modifications (e.g., exhaust, clutch, or suspension upgrades), the D4R90G can complement those changes by providing a more robust fuel delivery system. It pairs well with other BFO or aftermarket parts, creating a cohesive performance package.

5. **Better Fuel Efficiency (Under Certain Conditions)** While not a primary focus, some riders report improved fuel efficiency with a well-tuned D4R90G, particularly if the stock carburetor was running overly rich. A properly adjusted carburetor can optimize fuel consumption, though this depends heavily on tuning and riding style.

6. **Wider Availability of Parts and Support** BFO has a strong presence in the off-road community, meaning you ll likely find support, replacement parts, and tuning guides more easily than with some lesser-known brands. This can be helpful if you encounter issues or need adjustments.

7. **Visual and Brand Appeal** The D4R90G has a distinct, aggressive look that appeals to riders who prioritize aesthetics alongside performance. It s a recognizable upgrade that can enhance the bike s overall appearance.

---

1. **Cost** The D4R90G is more expensive than the stock carburetor. Prices typically range from $200 to $300, depending on the source and whether it comes with a tuning kit or additional accessories. This is a significant investment, especially if you re on a tight budget or only plan to use the bike occasionally.

2. **Learning Curve for Tuning** While the D4R90G is easier to maintain than some carburetors, it still requires a basic understanding of carburetor tuning to achieve optimal performance. Mismatching jets or improper adjustments can lead to poor fuel economy, rough idling, or even engine damage. If you re not comfortable with tuning, you may need to hire a professional, adding to the cost.

3. **Potential for Overcomplicating the Bike** If you re not planning extensive modifications, upgrading to a high-performance carburetor like the D4R90G might feel like overkill. The stock carburetor is already capable of handling the Big Bear 400 s power output adequately for casual or moderate use. Forcing a more aggressive carburetor may not provide noticeable benefits unless you re pushing the bike hard or modifying other components.

4. **Compatibility Issues with Stock Components** While the D4R90G is designed for the YFM400, there s a small chance of fitment or compatibility issues, especially if the bike has been heavily modified or if the carburetor isn t installed correctly. Always ensure the carburetor is properly aligned with the throttle body and intake system to avoid leaks or performance drops.

5. **Maintenance Requirements** High-performance carburetors like the D4R90G require more frequent cleaning and maintenance than stock units. Dust, dirt, and debris can clog the jets or passages more easily, leading to reduced performance if not cleaned regularly. This adds to the long-term cost of ownership.

6. **Possible Power Band Limitations** While the D4R90G improves mid-range and high-RPM performance, it may not significantly enhance low-end torque. If you rely heavily on low-end power (e.g., for climbing steep hills or slow-speed maneuvering), the benefits may be less noticeable. Some riders report a slight loss of low-end grip, which could be a drawback depending on your riding style.

7. **Warranty and Return Risks** Since the D4R90G is an aftermarket part, it may not be covered under Yamaha s warranty. If issues arise (e.g., leaks, poor performance), you ll be responsible for repairs or replacements, which could be costly.

---

### **Conclusion and Recommendation**

The **BFO D4R90G carburetor is a strong upgrade for the Yamaha Big Bear 400**, particularly if you re looking to enhance performance for aggressive riding, off-road use, or as part of a broader modification package. It offers noticeable improvements in throttle response, power delivery, and reliability, especially when paired with other performance parts. However, it s not a necessary upgrade for casual riders or those who prioritize simplicity and cost-effectiveness.

- You plan to modify the Big Bear 400 further (e.g., exhaust, clutch, or suspension upgrades) and want a carburetor that can handle the increased power.

- You ride aggressively, frequently push the bike to its limits, or use it in demanding off-road conditions where performance and durability are critical.

- You re willing to invest time in learning basic carburetor tuning or have access to a tuner to optimize the setup.

- You prefer the look and feel of a high-performance carburetor and don t mind the higher upfront cost.

- You use the Big Bear 400 primarily for casual riding, trail riding, or light off-roading where the stock carburetor performs adequately.

- You re on a tight budget and don t want to spend extra money on a part that may not provide significant benefits for your riding style.

- You re uncomfortable with tuning or don t have access to professional help for adjustments.

- You plan to keep the bike stock or only make minor modifications.

- **Stock Carburetor Cleaning and Tuning:** If your stock carburetor is dirty or poorly adjusted, cleaning and tuning it (or replacing the jets) may restore performance without the cost of an upgrade.

- **Mid-Range Carburetor Upgrades:** Brands like **Walbro** or **Keihin** offer carburetors that strike a balance between performance and cost. For example, a Walbro 600CFM carburetor is a popular alternative that s slightly less expensive and still provides noticeable gains.

- **Fuel Injection:** If you re open to a more modern solution, a **fuel injection system** (e.g., from **Walbro, Power Command, or Yamaha s own FI system**) can offer superior performance and tuning flexibility, though it s a more complex and expensive upgrade.

Ultimately, the D4R90G is a **solid choice for performance-oriented riders**, but it s not a universal solution. Weigh the pros and cons against your riding habits, budget, and long-term goals before making a decision.

Details:

Specifications. Always the correct part. TITLE: Carburetor Assembly For Yamaha Big Bear 400 YFM400 2000 2012. OE/Part number.

Outpatient. 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. Compatible price. For Yamaha Big Bear 250 2007 -2009, for 400 YFM 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. 2001 - 2007, for Yamaha Bruin 250 YFM 2005 - 2006, 350 2x4 4x4. 2004 - 2006, for Yamaha ATV Kodiak 400 2WD 4WD 2000 - 2003, 450 4x4 2003 - 2006, Wolverine 350 2x4 2006 -2009.

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. Finally, remove the throttle cable. Guaranteed Fitment. Fast Shipping.

Oil, unplug the oil pipe. Quick, Simple. Then you can load him into the car. Manufacturer.

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. 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. Package included. Price match guarantee.

specifications carbthrotatv:

• for models: Yfm400, 400, Bear
• for makes: Yamaha
• for years: 2000-2012
• brand: Bfo
• mpn: D4r90g
• 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

offer carbthrotatv:

• best offers: True
• quantity: 4
• availability: In Stock
• options: Ship-to-home
• started: May 8, 2026
• sold: 0

payments carbthrotatv:

• wallet: Google-pay
• other
• credit card: Mastercard

general carbthrotatv:

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

shipping carbthrotatv:

• cost: $0.00
• carrier: FedEx
• transit: 4-7 Days
• service: FedEx Ground / FedEx Home Delivery
• type: Fixed
• class: Standard

returns carbthrotatv:

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

seller carbthrotatv:

• rating: 99.7%
• # reviews: 6715
• city: Rowland height, California

Bfo D4R90G Is Similar To:

• Pqu12c Bfo Carburetor For Arctic Cat Atv Quad Carb (38% 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 (42.3% 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 (40.4% 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 (38.1% 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 (33.3% 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 (38.5% 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 (40.7% 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 (38.2% 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 (47.3% 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 (42.1% 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 (47% 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)