BFO KC1UJ8 Carburetor Big

( Brand: Bfo ), ( Manufacturer Part Number: KC1UJ8 ), ( 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 Quality Carburetor Yamaha Big fits BEAR WOLVERINE YFM400 YFM 400 350 2006–2009

The **BF&O KC1UJ8 Carburetor** is a meticulously engineered, high-performance replacement for the Yamaha Big Bear 400 (YFM/YFM400, 2006 2009) and the Wolverine 350, designed to restore and enhance the throttle response, fuel efficiency, and overall power delivery of these legendary outboard engines. Built to exacting standards, this carburetor features a **precision-machined aluminum body** with a robust, durable construction that ensures long-lasting reliability under demanding conditions. The KC1UJ8 is a direct drop-in replacement, eliminating the need for extensive modifications or adjustments, making it an ideal choice for both seasoned mechanics and DIY enthusiasts looking to upgrade their engine s performance without sacrificing ease of installation.

At the heart of this carburetor lies a **high-flow jet system** optimized for the Big Bear 400 s power requirements, delivering a precise balance of air-fuel mixture for optimal combustion. The **piston-type throttle body** ensures smooth and responsive acceleration, while the **sealed needle and jet assembly** prevents fuel leaks and maintains consistent performance over time. The KC1UJ8 also incorporates a **fuel pump adapter** compatible with Yamaha s stock fuel system, ensuring seamless integration with the engine s existing components. Whether you re preparing for a day of deep-sea fishing, high-speed cruising, or off-road adventure with the Wolverine 350, this carburetor is engineered to handle the rigors of heavy-duty operation while minimizing fuel waste and maximizing power output.

For those seeking a performance edge, the BF&O KC1UJ8 is available in both **stock and performance-tuned variants**, allowing you to fine-tune the carburetor to match your specific riding style or engine modifications. The **easy-to-service design** includes accessible jet and needle adjustments, enabling quick tuning for varying altitudes, fuel types, or load conditions. Additionally, the carburetor s **corrosion-resistant materials** and **O-ring-sealed fittings** ensure durability in saltwater environments, making it a dependable choice for marine applications. Whether you re restoring a vintage Big Bear 400 or upgrading a Wolverine 350 for enhanced performance, the BF&O KC1UJ8 carburetor delivers a blend of reliability, precision, and power that keeps pace with your demands.

### **Pros and Cons of Buying a BFO KC1UJ8 Carburetor for a Yamaha Big Bear 400 (YFM/YFM400 06-09) / Wolverine 350**

1. **Performance Improvement** The KC1UJ8 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 and better fuel-air mixture control, which can enhance overall engine performance.

2. **Durability and Quality** BFO (Big Four Forums) carburetors are known for their robust construction, using high-quality materials and precise machining. This can lead to fewer leaks, better sealing, and longer lifespan than some aftermarket alternatives.

3. **Easier Tuning and Adjustability** The KC1UJ8 features a more refined jet system and adjustable components (such as the pilot and main jets, needle, and float level), allowing for finer tuning to match fuel type, altitude, and riding conditions. This is particularly useful for those who want to optimize performance for track use or high-altitude riding.

4. **Compatibility with Modifications** Since the Big Bear 400 and Wolverine 350 are popular for aftermarket tuning, the KC1UJ8 works well with other performance upgrades like exhaust systems, camshafts, or fuel injection conversions (if considering a later upgrade).

5. **Better Fuel Efficiency (Under Certain Conditions)** With proper tuning, the KC1UJ8 can provide a more efficient fuel-air mixture, reducing wasteful fuel consumption compared to a poorly tuned stock carburetor.

6. **Resale Value for Modified Bikes** If you plan to keep the bike modified, a well-maintained BFO carburetor can add value, as it is a reputable brand in the off-road community.

7. **Wider Throttle Range** The design helps prevent "lean spikes" at higher RPMs, making the bike more stable and responsive in aggressive riding scenarios.

---

1. **Cost** The KC1UJ8 is more expensive than the stock carburetor (typically $200 $300 depending on the source), which may be a significant investment if you're on a tight budget. The price also includes the need for new jets, gaskets, and possibly a fuel pump upgrade if the stock one is weak.

2. **Learning Curve for Tuning** Unlike the stock carburetor, which is relatively simple to set up, the KC1UJ8 requires knowledge of carburetor theory, jet sizing, and fuel-air ratios. Improper tuning can lead to poor performance, rough idling, or even engine damage. Beginners may need to consult forums (like Big Four Forums) or a professional for guidance.

3. **Potential for Fuel Pump Issues** The Big Bear 400 s stock fuel pump is not always sufficient for high-performance carburetors like the KC1UJ8. If the pump struggles to keep up, you may experience fuel starvation at high throttle, leading to hesitation or stalling. Upgrading to a stronger pump (e.g., Walbro or BFO s own pump) may be necessary, adding to the cost.

4. **Maintenance Requirements** Carburetors require regular cleaning and adjustment to perform optimally. The KC1UJ8, while durable, is not maintenance-free. You ll need to periodically check for clogged jets, worn seals, and proper float level, which adds up in time and effort compared to a simpler system.

5. **Potential for Overkill (For Mild Mods)** If your bike is only lightly modified (e.g., stock engine, mild exhaust, or minimal cam changes), the KC1UJ8 may offer marginal gains. In such cases, a less expensive aftermarket carburetor (e.g., a Walbro or a remanufactured stock carb) might suffice.

6. **Installation Complexity** While not extremely difficult, installing a new carburetor requires careful attention to throttle cable routing, vacuum lines, and electrical connections (for the choke system). Mistakes here can lead to drivability issues.

7. **Risk of Voiding Warranty (If Applicable)** If your bike is still under manufacturer warranty, installing an aftermarket carburetor may void certain coverage, depending on the terms.

---

The **BFO KC1UJ8 carburetor is a strong choice for Yamaha Big Bear 400 / Wolverine 350 owners who are serious about performance tuning, willing to invest time in learning carburetor theory, and prepared for the associated costs.** It excels in scenarios where you want smoother power delivery, better throttle response, and the ability to fine-tune the bike for track use or high-performance riding. However, it is **not a "set-and-forget" upgrade** it demands attention to tuning, maintenance, and potentially additional modifications (like a fuel pump upgrade).

If you are a **casual rider or only making minor modifications**, a less expensive carburetor (e.g., a remanufactured stock carb or a budget aftermarket option) might be a more practical choice. On the other hand, if you are **building a high-performance bike, racing, or pushing the engine hard**, the KC1UJ8 is a worthwhile investment that can significantly enhance your riding experience.

---

- You are committed to tuning your bike for better performance.

- You have access to resources (forums, YouTube guides) to properly set it up.

- You are prepared to budget for additional upgrades (fuel pump, jets, gaskets).

- You plan to ride aggressively or compete in off-road events.

- You want a simple, low-cost upgrade with minimal tuning required.

- Your bike is only lightly modified, and you don t need high-performance gains.

- You lack the time or patience to troubleshoot carburetor issues.

**Final Tip:** Before purchasing, research tuning guides specific to the KC1UJ8 for your bike model, and consider consulting with experienced riders or mechanics who have worked with this carburetor. Proper setup is key to avoiding frustration or performance issues.

Details:

Then you can load him into the car. Telephone number. 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.

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. 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. Product Quality Carburetor for Yamaha Big Bear 400 YFM YFM400 06-09 WOLVERINE 350. 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. Finally, remove the throttle cable. 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. Guaranteed Fitment Always the correct part. Fast Shipping. 2004 - 2006, for Yamaha ATV Kodiak 400 2WD 4WD 2000 - 2003, 450 4x4 2003 - 2006, Wolverine 350 2x4 2006 -2009.

Package included.

specifications carbthrotatv:

• for models: Yfm400, Yfm, 400, 350, Bear, Wolverine
• for makes: Yamaha
• for years: 2006-2009
• brand: Bfo
• mpn: Kc1uj8
• 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

general carbthrotatv:

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

payments carbthrotatv:

• wallet: Paypal
• credit card: Discover
• other

seller carbthrotatv:

• city: Rowland height, California
• # reviews: 11577
• rating: 99.2%

returns carbthrotatv:

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

offer carbthrotatv:

• options: Ship-to-home
• sold: 0
• started: March 13, 2026
• availability: In Stock
• quantity: 10
• best offers: True

shipping carbthrotatv:

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

Bfo KC1UJ8 Is Similar To:

• Pqu12c Bfo Carburetor For Arctic Cat Atv Quad Carb (34.3% 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 (35.3% 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 (37.8% 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 (37.4% 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 (34.4% 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 (30.8% 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 (39.7% 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 (30.6% 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 (40.3% 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 (35.6% 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 (40.6% 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)