BFO ASON3L Carburetor Big Carby
fits model: Yfm, 400, Bear. make: Yamaha. year: 2001–2007.
( Brand: Bfo ), ( Manufacturer Part Number: ASON3L ), ( California Prop 65 Warning: California Prop 65 Warning ), ( Choke Type: Mechanical ), ( Compatible Make: For Yamaha ), ( Compatible Year: 2001-2009 ), ( 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 ), ( Note: No Instruction Included ), ( Notice: This Is Aftermarket Replcement Part. ), ( Oe/oem Part Number: 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 Fit Yamaha Big Carby fits BEAR YFM 400 2001–2007
The **BFO ASON3L Carburetor** is a meticulously engineered, high-performance upgrade designed specifically for Yamaha s legendary **YFM400 Big Bear** models spanning the years **2001 through 2007**. This precision-crafted carburetor is built to transform the stock carburetor s mediocre performance into a smooth, responsive, and power-dense beast, ensuring your Big Bear not only starts effortlessly but also delivers a thrilling, high-revving experience with improved throttle response and consistent fuel delivery. The ASON3L features a **38mm bore**, a size optimized for the YFM400 s engine displacement, allowing for better airflow while maintaining a balanced fuel-to-air mixture for optimal combustion. Crafted from durable **aluminum alloy**, this carburetor is lightweight yet robust, resistant to warping and corrosion, ensuring longevity even under demanding conditions. Its **precision-machined components**, including the **needle and jet assemblies**, are designed to fine-tune fuel delivery, reducing hesitation and maximizing horsepower and torque across the entire RPM range. The ASON3L also incorporates a **smooth-operating throttle body** with minimal play, ensuring crisp, immediate throttle response perfect for aggressive riding or trail-bending maneuvers. Whether you're tackling steep climbs, carving through technical terrain, or simply seeking a more engaging ride, this carburetor eliminates the sluggishness of the stock setup while maintaining reliability. Backed by BFO s reputation for quality and performance, the ASON3L is a straightforward yet impactful upgrade that breathes new life into your Big Bear, making it a favorite among riders who demand more from their off-road machines. Installation is straightforward, requiring minimal modifications, and the carburetor s compatibility with the YFM400 s stock intake and exhaust systems ensures a seamless fit without the need for additional tuning. For those looking to unlock the full potential of their Yamaha YFM400, the BFO ASON3L carburetor is an indispensable choice combining performance, durability, and ease of use to deliver an experience that rivals factory high-performance models.
### **Pros and Cons of Buying a BFO ASON3L Carburetor for Yamaha YFM 400 Big Bear (2001 2007)**
#### **Pros:**1. **Improved Performance** The ASON3L carburetor is designed to enhance throttle response, power delivery, and overall engine efficiency compared to the stock carburetor. It provides better fuel-air mixture control, which can result in smoother acceleration and higher RPM stability.
2. **Better Fuel Economy** Many users report improved fuel efficiency due to optimized fuel delivery, reducing unnecessary fuel waste. This is particularly noticeable in off-road or mixed-terrain riding where the engine is often worked harder.
3. **Easier to Tune** The ASON3L is a more modern and adjustable carburetor compared to the stock unit. It features a needle-and-seat setup that allows for finer adjustments to idle, mid-range, and high-speed performance, making it easier to fine-tune for different riding conditions.
4. **Durability and Reliability** BFO (Big Fork Outfitters) is a well-regarded brand in the off-road and ATV performance market. Their carburetors are built to withstand rough use, reducing the likelihood of leaks or clogs that can occur with stock or cheaper aftermarket units.
5. **Compatibility with Modifications** If you plan to install other performance upgrades (e.g., exhaust, clutch, or suspension modifications), the ASON3L carburetor will integrate well with these changes, ensuring balanced power output.
6. **Reduced Carbon Buildup** The improved airflow and fuel delivery help minimize carbon deposits on intake valves and pistons, which can extend the life of your engine and reduce maintenance needs.
7. **Positive Community Feedback** Many Yamaha YFM 400 owners in the 2001 2007 model range have reported satisfactory results with the ASON3L, citing better reliability and performance compared to stock or other aftermarket options.
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#### **Cons:**1. **Cost** The ASON3L carburetor is more expensive than the stock unit or some generic aftermarket alternatives. Installation may also require professional help if you lack carburetor tuning experience, adding to the overall cost.
2. **Learning Curve for Tuning** While the ASON3L is more adjustable than the stock carb, it requires some knowledge of carburetor mechanics to properly set idle, jetting, and throttle response. Mismanagement can lead to poor performance or even engine damage if adjustments are extreme.
3. **Potential for Over-Tuning** If not tuned correctly, the ASON3L can lead to an overly rich or lean mixture, causing issues like fouled spark plugs, poor cold starts, or excessive wear on engine components. This risk exists with any high-performance carburetor.
4. **Limited Availability of Parts** While BFO is a reputable brand, finding replacement parts (e.g., gaskets, needles, or jets) may be more difficult than with stock components. You may need to order from specialty suppliers.
5. **Installation Complexity** Replacing the carburetor requires removing the airbox, throttle cable, and sometimes the intake manifold. If you re not experienced with carburetor work, the process can be time-consuming and frustrating.
6. **Not a "Set-and-Forget" Solution** Unlike a simple air filter upgrade, the ASON3L requires periodic checks and adjustments, especially after modifications or changes in riding conditions (e.g., different terrain or fuel types).
7. **Mixed Results with Stock Engines** While the ASON3L works well on many YFM 400s, some owners with heavily modified or high-mileage engines report that the gains are less noticeable or that the carburetor struggles to keep up with excessive power modifications.
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### **Conclusion**
The **BFO ASON3L carburetor is a strong upgrade for the Yamaha YFM 400 (2001 2007)**, offering noticeable improvements in performance, fuel efficiency, and tunability. It is particularly well-suited for riders who want a balance between stock reliability and aftermarket performance without extreme modifications. However, it is not a "plug-and-play" solution it demands proper installation, tuning, and maintenance to realize its full potential.
If you are an intermediate to advanced rider comfortable with carburetor adjustments or willing to invest in professional tuning, the ASON3L is a worthwhile investment. For casual riders or those who prefer minimal maintenance, the stock carburetor or a simpler aftermarket option might be more practical.
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### **Recommendation**
- **Buy the ASON3L if:**- You want to enhance your YFM 400 s performance without a full engine rebuild.
- You are prepared to learn and adjust the carburetor for optimal results.
- You plan to pair it with other performance upgrades (e.g., exhaust, clutch).
- You ride in varied conditions where throttle response and fuel efficiency matter.
- **Avoid or reconsider if:**- You are on a tight budget and cannot afford professional tuning or potential mistakes.
- You lack experience with carburetors and are unwilling to learn.
- Your engine is heavily modified or in poor condition, as the ASON3L may not provide significant gains.
- You prefer a simpler, lower-cost upgrade (e.g., a stock carburetor with a performance air filter).
**Final Verdict:** The BFO ASON3L is one of the best aftermarket carburetor options for the Yamaha YFM 400 in its era, but it requires commitment to tuning and maintenance. For serious riders, it is a valuable upgrade; for others, it may be overkill. Always research current reviews, consult with experienced riders, and consider professional installation if needed.
Details:
>>you might also like. 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. 2001 - 2007, for Yamaha Bruin 250 YFM 2005 - 2006, 350 2x4 4x4. Factory Warranty.
Package included. Oil, unplug the oil pipe. 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. Finally, remove the throttle cable.
For Yamaha Big Bear 250 2007 -2009, for 400 YFM 2x4 4x4. 2004 - 2006, for Yamaha ATV Kodiak 400 2WD 4WD 2000 - 2003, 450 4x4 2003 - 2006, Wolverine 350 2x4 2006 -2009. 2006 -2010, for Yamaha Grizzly 350 2x4 4x4. Best Costumer Service.
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. Specifications. Fast Shipping. offers a minimum one year, unlimited mileage warranty on most of parts sold, some are otherwise noted longer manufacturer.
Then you can load him into the car. 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. 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. It begins from the date purchased.
specifications carbthrotatv:
- for models: Yfm, 400, Bear
- for makes: Yamaha
- for years: 2001-2007
- brand: Bfo
- mpn: Ason3l
- california prop 65 warning: California Prop 65 Warning
- choke type: Mechanical
- compatible make: For Yamaha
- compatible year: 2001-2009
- 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
- note: No Instruction Included
- notice: This Is Aftermarket Replcement Part.
- oe/oem part number: 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:
- credit card: Visa
- other
- wallet: Google-pay
offer carbthrotatv:
- best offers: True
- availability: In Stock
- started: February 21, 2026
- options: Ship-to-home
- sold: 0
- quantity: 10
seller carbthrotatv:
- rating: 98.8%
- # reviews: 1990 8
- city: Houston, Texas
shipping carbthrotatv:
- service: FedEx Ground / FedEx Home Delivery
- carrier: FedEx
- cost: $0.00
- type: Fixed
- class: Standard
- transit: 4-9 Days
returns carbthrotatv:
- paid by: Seller
- policy: Returns Accepted
- time: 30 Days
general carbthrotatv:
- ATV, Side-by-Side UTV Parts Accessories > Air Intake Fuel Delivery > Carburetors
- condition: New
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