BFO COSV4M Carburetor Carb

( Brand: Bfo ), ( Manufacturer Part Number: COSV4M ), ( 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 Fit Yamaha fits WARRIOR YFM350X YFM350 350 1987–2004

The **BFO COSV4M Carburetor** is a meticulously engineered, high-performance replacement carburetor specifically designed to restore and enhance the throttle response, power delivery, and overall performance of Yamaha s legendary **Warrior 350 (YFM350X/YFM350)** models produced between **1987 and 2004**. Crafted with precision and built to exacting standards, this carburetor is a direct upgrade over the stock unit, offering improved fuel atomization, smoother acceleration, and better fuel efficiency all while maintaining the classic reliability and ruggedness that Yamaha enthusiasts have come to expect. The COSV4M features a **four-hole main jet system**, which ensures optimal fuel-air mixture under varying load conditions, whether you're cruising on the highway, navigating tight trails, or tackling steep climbs. Its **durable aluminum body** is reinforced with high-quality seals and gaskets, preventing leaks and ensuring a tight, secure fit with the stock intake and throttle linkage, minimizing the risk of vacuum loss or carburetor float issues. One of the standout features of this carburetor is its **adjustable throttle stop screw**, allowing riders to fine-tune the idle and low-end performance to their preference, whether they prefer a slightly richer mixture for cold starts or a leaner setting for better throttle response. The COSV4M also incorporates a **high-flow pilot jet**, which enhances idle stability and reduces stalling, particularly beneficial for riders who frequently operate at lower speeds or in stop-and-go traffic. For those who demand even greater performance, this carburetor is compatible with a wide range of aftermarket upgrades, including performance air filters, high-flow exhaust systems, and electronic fuel injection (EFI) conversions, making it a versatile choice for both stock and modified Warrior 350 setups. Whether you're restoring a classic bike to its original glory or pushing the limits of a modified rig, the BFO COSV4M carburetor delivers a seamless blend of reliability, performance, and ease of installation, ensuring that your Yamaha Warrior 350 runs with the same spirited efficiency it was designed for only better.

### **Pros and Cons of Buying a BF0-COSV4M Carburetor for a Yamaha Warrior 350 (YFM350X/YFM350, 1987 2004)**

1. **OEM Replacement Quality** The BF0-COSV4M is an original-equipment (OEM) carburetor designed specifically for the Yamaha Warrior 350, ensuring a perfect fit and reliable performance. It meets the manufacturer s original specifications, reducing the risk of compatibility issues.

2. **Reliability and Durability** Yamaha s carburetors are known for their robustness, especially in older models like the Warrior 350. A genuine or high-quality aftermarket replacement (such as BF0 s) should provide long-term dependability, especially if properly maintained.

3. **Ease of Installation** Since it is an exact replacement, swapping in the BF0-COSV4M should be straightforward, requiring minimal modifications. No major adjustments to the intake or throttle linkage are typically needed.

4. **Performance Consistency** The carburetor is tuned to match the engine s original powerband, ensuring smooth acceleration, stable idle, and proper fuel-air mixture. This is particularly important for maintaining the stock character of the bike without excessive modifications.

5. **Availability of Parts and Support** BF0 (a division of Yamaha) offers genuine parts, which means you can easily find replacement jets, gaskets, or seals if needed. Additionally, Yamaha dealerships and specialists are familiar with these components, making repairs or adjustments easier.

6. **Cost-Effective for Basic Replacement** While not the cheapest option, a BF0-COSV4M is often more affordable than a full engine rebuild or a complete carburetor overhaul. It provides a straightforward solution for restoring stock performance.

7. **Compatibility with Stock Modifications** If you plan to keep the bike stock or make only minor upgrades (e.g., exhaust, air filter), this carburetor will integrate seamlessly without requiring significant tuning.

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1. **Potential for Wear or Failure** Like any mechanical component, the BF0-COSV4M can wear out over time, especially if the bike has high mileage or was previously neglected. Symptoms of a failing carburetor include rough idling, hesitation, flooding, or poor acceleration.

2. **Maintenance Requirements** Carburetors require regular cleaning, jet adjustments, and gasket replacements to function optimally. Neglecting maintenance can lead to clogged passages, incorrect fuel mixtures, or complete failure.

3. **Limited Performance Gains** If you re looking to significantly increase power beyond stock levels, this carburetor alone won t suffice. For performance upgrades, you d need to pair it with other modifications (e.g., a high-flow intake, performance exhaust, or a larger carburetor like a Mikuni or Keihin).

4. **Potential for Counterfeit or Low-Quality Replacements** If purchasing from an unverified seller, there s a risk of receiving a knockoff or poorly made carburetor. Always buy from reputable sources (e.g., Yamaha dealerships, trusted online retailers, or known motorcycle parts shops) to avoid this issue.

5. **Adjustment Necessity** Even a new carburetor may require initial tuning (e.g., idle speed, mixture screws) to achieve perfect performance. This may require some mechanical skill or a visit to a bike shop.

6. **Environmental and Fuel Sensitivity** Older carburetors can struggle with modern fuel formulations (e.g., ethanol blends), leading to richer mixtures, fouling, or poor performance. Some riders report that switching to a cleaner fuel or using carburetor additives helps mitigate this.

7. **Limited Longevity Compared to Fuel Injection** While durable, carburetors are less efficient and reliable than modern fuel-injected systems. If you re planning long-term use or heavy riding, you may eventually need to consider upgrading to a more advanced fueling system.

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The BF0-COSV4M carburetor is an excellent choice for restoring or maintaining stock performance on a Yamaha Warrior 350 from 1987 2004. It offers reliability, ease of installation, and compatibility with the original engine setup. However, it is not a "set-and-forget" component it demands regular maintenance to avoid common issues like clogging or poor fuel delivery.

If your primary goal is to return the bike to its original condition or make minor upgrades, this carburetor is a solid, cost-effective solution. For serious performance tuning or long-term reliability, consider pairing it with other upgrades (e.g., a high-performance air filter, exhaust, or even a carburetor kit with upgraded jets).

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- **Buy from a trusted source** (Yamaha dealer, reputable online retailer, or a known motorcycle parts specialist) to ensure authenticity and quality.

- **Inspect the carburetor thoroughly** upon receipt check for cracks, leaks, or signs of wear before installation.

- **Clean and service the carburetor** before use, including replacing gaskets, cleaning jets, and adjusting the idle mixture.

- **Follow a maintenance schedule** clean the carburetor every 500 1,000 miles and perform a full overhaul every 2 3 years, depending on usage.

- **Consider upgrading other components** if you plan to push the bike harder (e.g., exhaust, intake, or a performance carburetor kit).

- **Monitor performance closely** after installation. If you notice rough idling, stalling, or poor acceleration, consult a mechanic to fine-tune the carburetor.

For most riders seeking a straightforward, reliable replacement, the BF0-COSV4M is a **strong recommendation** provided you re willing to put in the effort to maintain it properly. If you re unsure about carburetor adjustments, a bike shop can help with initial setup.

Details:

2004 - 2006, for Yamaha ATV Kodiak 400 2WD 4WD 2000 - 2003, 450 4x4 2003 - 2006, Wolverine 350 2x4 2006 -2009. Specifications. The reason for return. For shipping damage case.

Package included. 2001 - 2007, for Yamaha Bruin 250 YFM 2005 - 2006, 350 2x4 4x4. OE/Part number. Carburetor Carb Fit for Yamaha Warrior 350 YFM350X YFM350 X 1987 - 2004.

Our mechanic will inspect every return item. Item Quality problem. Finally, remove the throttle cable. 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.

For Yamaha Big Bear 250 2007 -2009, for 400 YFM 2x4 4x4. 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. 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. Then you can load him into the car. 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. Return items must be in original condition.

Return item must be in brand new and unused condition with original tags packaging.

specifications carbthrotatv:

• for models: Yfm350x, Yfm350, 350, Warrior
• for makes: Yamaha
• for years: 1987-2004
• brand: Bfo
• mpn: Cosv4m
• 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

seller carbthrotatv:

• city: Houston, Texas
• # reviews: 723
• rating: 99.6%

shipping carbthrotatv:

• class: Standard
• type: Fixed
• cost: $0.00
• carrier: FedEx
• service: FedEx Ground / FedEx Home Delivery
• transit: 3-6 Days

returns carbthrotatv:

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

payments carbthrotatv:

• other
• credit card: Discover
• wallet: Paypal

general carbthrotatv:

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

offer carbthrotatv:

• sold: 0
• quantity: 8
• started: May 15, 2026
• options: Ship-to-home
• best offers: True
• availability: In Stock

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