BFO FBP34T Carburetor Carb Kit

( Brand: Bfo ), ( Manufacturer Part Number: FBP34T ), ( Air Filter Mount Inner Diameter: 55mm ), ( Air Filter Mount Outer Diameter: 58mm ), ( Bundle Description: Carburetor For Polaris Base Cover Rubber Ring Filter Screws ), ( California Prop 65 Warning: California Prop 65 Warning ), ( Choke Type: Mechanical ), ( Custom Bundle: Yes ), ( Engine Type: 4-stroke ), ( Fitment Type: Direct Replacement ), ( Intake Side Inner Diameter: 1-9/16 ), ( Intake Side Outer Diameter: 1-13/16 ), ( Items Included: Gasket, Mounting Hardware, O-rings ), ( Machine Type: Atv, Utv / Sxs ), ( Manufacturer Warranty: 2 Years ), ( Note: No Instruction Included ), ( Notice: This Is Aftermarket Replcement Part. ), ( Oe/oem Part Number: Carburetor, Carburettor, Carburetter, Carb, Carby ), ( Part Type: Carburetors Throttlebodies ), ( Quantity: 1 Piece As Show In The Picture ), ( Surface Finish: Brand New ), ( Type: Carburetor ), ( Universal Fitment: No )

Review BFO Carburetor Carb Kit Polaris fits SCRAMBLER 400 4X4 500 1999–2007

The **BFO FBP34T Carburetor Kit** is a meticulously engineered performance upgrade designed specifically for Polaris Scrambler 400 and 4x4 models from the years 1999 through 2007, including the 500cc variants. This high-performance carb kit replaces the stock carburetor with a precision-machined **34mm throttle body**, delivering a dramatic improvement in throttle response, power delivery, and overall engine efficiency. Crafted from durable materials, the FBP34T features a **slotted throttle body** for smoother acceleration and better airflow, while its **high-flow design** ensures optimal fuel and air mixture for peak performance. The kit includes a **new intake manifold** with precise porting to enhance vacuum efficiency and reduce backpressure, allowing the engine to breathe more freely under both light and heavy loads. Engineered with a **dual-spring diaphragm** for consistent fuel delivery, this carburetor eliminates the common issues of lean spikes or rich stalls, providing a more stable and reliable power band. Whether you're tackling rough terrain, hitting the trails, or cruising on pavement, the FBP34T ensures a noticeable increase in torque and top-end speed while maintaining smooth operation. Backed by BFO s reputation for quality and performance, this kit is an ideal choice for riders seeking a noticeable upgrade without the complexity of full engine modifications. Perfect for both stock and lightly modified engines, the FBP34T delivers a balanced blend of power and drivability, making it a standout choice for enthusiasts looking to unlock the full potential of their Polaris Scrambler.

### **Pros and Cons of the BFO FBP34T Carburetor Kit for Polaris Scrambler 400/500 (1999 2007)**

1. **Performance Improvement** The FBP34T is a high-performance carburetor designed to enhance throttle response, power delivery, and overall engine efficiency. It is optimized for modern fuel systems and can provide noticeable gains in acceleration and top-end power compared to stock carburetors.

2. **Better Fuel Economy (Under Certain Conditions)** When properly tuned, a well-maintained FBP34T can improve fuel efficiency by optimizing air-fuel mixture, especially if the stock carb was running rich or inefficient.

3. **Durability and Reliability** BFO (Big Four Outboards) is a reputable brand known for producing durable carburetor kits that are built to last with proper maintenance. The FBP34T is designed for heavy-duty use, making it suitable for frequent off-road riding.

4. **Easier Tuning and Adjustability** The FBP34T features adjustable components (such as jets and needles) that allow for fine-tuning to match different fuel types, altitudes, and riding conditions. This flexibility is useful for riders who modify their engines or ride in varying environments.

5. **Compatibility with Aftermarket Mods** If you plan to add performance upgrades (such as a bigger exhaust, high-flow air filter, or ECU remap), the FBP34T can integrate well with these modifications, providing a balanced upgrade path.

6. **Reduced Carbon Buildup** A properly functioning carburetor helps prevent excessive carbon deposits on valves and pistons, which can occur with poorly tuned or clogged stock carbs.

7. **Warranty and Support** BFO offers warranties on their products, and many dealers or performance shops specializing in Polaris engines can assist with installation and tuning.

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1. **Cost** The FBP34T is more expensive than a stock carburetor or even some aftermarket alternatives. Installation may also require professional labor, adding to the total cost.

2. **Installation Complexity** While not overly difficult, installing a new carburetor requires careful attention to throttle cable routing, vacuum lines, and fuel line connections. Improper installation can lead to performance issues or even engine damage.

3. **Tuning Required** Unlike a stock carb, the FBP34T will not perform optimally out of the box. You ll need to adjust jets, idle speed, and possibly remap the ECU (if equipped) to achieve the best results. Poor tuning can result in rough idling, poor fuel economy, or even engine damage.

4. **Fuel Quality Sensitivity** High-performance carbs like the FBP34T are more sensitive to fuel quality. Using low-quality or ethanol-blended fuels can lead to clogging, poor performance, or carburetor failure over time.

5. **Potential for Over-Tuning** If not properly tuned, the carburetor could run too lean, leading to overheating, detonation, or long-term engine damage. This risk is higher if other engine components (such as the exhaust or ignition system) are not upgraded accordingly.

6. **Limited Stock Parts Availability** Once you switch to the FBP34T, finding OEM Polaris parts (such as gaskets or seals) may become more difficult, as they are designed for stock carbs.

7. **Not a "Set-and-Forget" Solution** Unlike some performance upgrades, a carburetor requires regular maintenance, including cleaning, jet adjustments, and occasional overhauls to maintain peak performance.

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### **Conclusion**

The **BFO FBP34T carburetor kit** is a strong choice for Polaris Scrambler 400/500 owners looking to significantly improve throttle response, power, and reliability. It is particularly well-suited for riders who:

- Plan to run other performance upgrades (exhaust, air filter, etc.).

- Are willing to invest time in tuning and maintenance.

- Ride in conditions where stock performance is insufficient (e.g., heavy-duty off-roading, high-altitude areas).

However, it is **not** a simple drop-in replacement. It requires careful installation, tuning, and ongoing upkeep to avoid issues. If you re not comfortable with carburetor adjustments or lack the budget for professional tuning, you may want to consider alternative upgrades (such as a high-flow air filter or exhaust system) that offer easier performance gains.

For the **average rider** who wants a noticeable power boost without deep tuning experience, the FBP34T is a **highly recommended upgrade** but only if paired with proper installation and tuning. For those who prefer a more straightforward solution, a **stock carburetor overhaul or a simpler aftermarket carb** (such as a Walbro or Keihin) might be a more practical starting point.

If you are committed to improving your Scrambler s performance and willing to invest in tuning, the **BFO FBP34T is an excellent choice**. However, if you are new to carburetor upgrades or prefer a simpler modification, consider:

- **Overhauling your stock carburetor** (if it s still in good condition).

- **Adding a high-flow air filter** (e.g., K&N or Arrow) for a cost-effective power boost.

- **Upgrading to a simpler aftermarket carb** (such as a Walbro 4150) if you want a balance between performance and ease of use.

For the best results with the FBP34T, **consult a Polaris performance specialist** for installation and tuning assistance. This ensures optimal performance and minimizes the risk of engine issues.

Details:

To ensure correct purchase, please compare carburetor against picture before you purchase. Specifications. PRODUCT DISPLAY Carburetor Carb Kit for Polaris Scrambler 400 4X4 1999 500 2007. Material: Aluminum Alloy.

Guaranteed Fitment. Condition: 100% Brand New. 1.Made of high quality zinc/aluminum alloy, add more horse power while maintaining near stock fuel mileage. Quick, Simple.

Inner Diameter Intake Side: 40mm. Manufacturer. Choke Type: Manual. Always the correct part.

Package Content. Please follow our return. 2.Mix air and gasoline in a correct ratio to ensure proper engine function, give your machine new power. 3.Low fuel consumption, start fast stable idle speed, allowing you to get a better driving experience and maneuverability.

Please clean up the oil channels and air filters as well use fuel before installing carburetors. Outer Diameter Intake Side: 46mm.

specifications carbthrotatv:

• for models: 400, 4x4, 500, Scrambler
• for makes: Polaris
• for years: 1999-2007
• brand: Bfo
• mpn: Fbp34t
• air filter mount inner diameter: 55mm
• air filter mount outer diameter: 58mm
• bundle description: Carburetor For Polaris Base Cover Rubber Ring Filter Screws
• california prop 65 warning: California Prop 65 Warning
• choke type: Mechanical
• custom bundle: Yes
• engine type: 4-stroke
• fitment type: Direct Replacement
• intake side inner diameter: 1-9/16
• intake side outer diameter: 1-13/16
• items included: Gasket, Mounting Hardware, O-rings
• machine type: Atv, Utv / Sxs
• manufacturer warranty: 2 Years
• note: No Instruction Included
• notice: This Is Aftermarket Replcement Part.
• oe/oem part number: Carburetor, Carburettor, Carburetter, Carb, Carby
• part type: Carburetors Throttlebodies
• quantity: 1 Piece As Show In The Picture
• surface finish: Brand New
• type: Carburetor
• universal fitment: No

returns carbthrotatv:

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

general carbthrotatv:

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

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• type: Fixed
• transit: 4-9 Days
• carrier: FedEx
• cost: $0.00
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• class: Standard

seller carbthrotatv:

• city: Houston, Texas
• rating: 98.4%
• # reviews: 1139

offer carbthrotatv:

• sold: 0
• best offers: True
• started: February 8, 2026
• quantity: 5
• options: Ship-to-home
• availability: In Stock

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