BFO U2L5JR Carburetor

( Brand: Bfo ), ( Manufacturer Part Number: U2L5JR ), ( 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: 40mm ), ( Intake Side Outer Diameter: 46mm ), ( Items Included: Gasket, Mounting Hardware, O-rings ), ( Machine Type: Atv ), ( Manufacturer Warranty: 2 Years ), ( Material: Alloy, Aluminum ), ( Mounting Flange Type: Bolt On ), ( 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 ), ( Country Of Origin: China )

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

The **BFO U2L5JR carburetor** is a meticulously engineered, high-performance replacement part designed specifically for Polaris Scrambler 400 and 4x4 models manufactured between **1999 and 2007**, including both the 400cc and 500cc variants. This precision-crafted carburetor is built to restore and enhance the throttle response, fuel efficiency, and overall power delivery of your Polaris Scrambler, ensuring it runs with the same aggressive spirit as it did when it left the factory. Engineered with a **durable aluminum body**, the U2L5JR features a **reliable piston-type throttle valve** that provides smooth, progressive acceleration, eliminating the common issues of stalling, hesitation, or uneven power delivery that can plague stock carburetors over time. Its **precision-machined internals** including the pilot jet, main jet, and idle circuit are designed to deliver an optimal fuel-air mixture, whether you're cruising on the trail, tackling rough terrain, or hitting the throttle for a burst of speed. The carburetor is fully compatible with modern fuel standards and is built to withstand the demands of off-road riding, reducing the risk of clogging or performance degradation even under heavy loads. Whether you're restoring a classic Scrambler to its original glory or upgrading an existing setup for better reliability and performance, the BFO U2L5JR is a trusted choice that balances **durability, ease of installation, and superior fuel management**. With its **OEM-fitment quality** and aftermarket reputation for longevity, this carburetor is an excellent investment for riders who demand both power and precision from their Polaris.

### **Pros and Cons of Buying a BF0U2L5JR Carburetor for a Polaris Scrambler 400/500 4x4 (1999 2007)**

1. **OEM Replacement** The BF0U2L5JR is the exact factory carburetor for the 400/500 4x4 Scrambler models from 1999 to 2007, ensuring a perfect fit without modifications.

2. **Reliability** As an original component, it is built to the same high standards as the one that came with your bike, reducing the risk of premature failure.

3. **Performance Consistency** Since it matches the engine s original specifications, it will deliver the same power, throttle response, and fuel efficiency as the stock setup.

4. **Ease of Installation** No tuning or adjustments are typically required beyond basic carburetor setup (jet sizing, float level, etc.), making it a straightforward replacement.

5. **Availability of Parts** Being an older but widely used component, you ll have access to gaskets, seals, and replacement parts if needed.

6. **Cost-Effective for Basic Use** If you primarily ride on stock or lightly modified setups, this carburetor is a budget-friendly way to maintain factory performance.

7. **No Risk of Voiding Warranty** Unlike aftermarket carburetors, using the OEM part won t void any remaining manufacturer warranties on the engine.

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1. **Limited Performance Gains** The BF0U2L5JR is not designed for high-performance tuning. If you plan to run a supercharger, forced induction, or aggressive modifications, this carburetor will quickly become a bottleneck.

2. **Throttle Response May Feel Sluggish** Older Polaris carburetors (especially on 400/500 engines) can suffer from vacuum leaks, dirty jets, or worn diaphragms, leading to a less responsive throttle.

3. **Fuel Efficiency Concerns** Carburetors are less efficient than modern fuel injection systems, meaning you may experience slightly worse gas mileage compared to newer models.

4. **Potential for Wear** If the original carburetor was neglected, the new one may still suffer from carbon buildup, worn needles, or clogged jets, requiring periodic cleaning or adjustment.

5. **No Modern Adjustability** Unlike some aftermarket carburetors, the BF0U2L5JR lacks modern features like progressive linkage or digital tuning options, limiting fine-tuning capabilities.

6. **Environmental and Emissions Issues** Carbureted engines produce more hydrocarbons and CO than fuel-injected ones, which may not meet modern emissions standards if used in restricted areas.

7. **Depreciation Risk** If you plan to sell the bike later, a stock carburetor may not appeal to buyers looking for performance upgrades.

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The **BF0U2L5JR carburetor is an excellent choice** if you want a **direct OEM replacement** for your 1999 2007 Polaris Scrambler 400/500 4x4 and plan to keep the bike in **stock or lightly modified condition**. It provides **reliability, ease of installation, and familiarity** with the original setup. However, if you intend to **modify the engine for higher performance** (e.g., forced induction, aggressive camshafts, or high-RPM use), this carburetor will **quickly become inadequate**, and an aftermarket option (such as a **Walbro 1050CFM, Mikuni BS32, or Keihin FCR**) would be a better long-term investment.

For **daily riding, trail use, or casual performance tuning**, the BF0U2L5JR is a **solid, no-frills solution**. If you re looking for **better throttle response, fuel economy, or upgrade potential**, consider pairing it with a **carburetor cleaner, fresh jets, and a vacuum leak check** or explore aftermarket alternatives if you plan to push the engine harder.

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- You want a **direct OEM replacement** with minimal hassle.

- Your riding style is **stock or lightly modified** (no forced induction).

- You prioritize **reliability and ease of maintenance** over peak performance.

- You re on a **tight budget** and don t need aggressive power gains.

- You plan to **modify the engine** (turbo, supercharger, aggressive camshafts).

- You want **better throttle response and fuel efficiency**.

- You ride **aggressively or at high RPMs** frequently.

- You re open to **tuning and fine adjustments** for optimal performance.

- The **fuel system is clean** (fuel filter, lines, and tank are free of debris).

- The **carburetor is properly adjusted** (float level, idle mixture, and jet sizing).

- The **engine is in good condition** (no vacuum leaks, proper valve adjustment, and clean air filter).

For most **stock or lightly modified Scrambler owners**, the BF0U2L5JR is a **practical and cost-effective choice**. However, if performance is a priority, weigh the trade-offs carefully before committing.

Details:

1.Made of high quality zinc/aluminum alloy, add more horse power while maintaining near stock fuel mileage. To ensure correct purchase, please compare carburetor against picture before you purchase. >>you might also like. 3.Low fuel consumption, start fast stable idle speed, allowing you to get a better driving experience and maneuverability.

It begins from the date purchased. Package Content. For Polaris Sportsman 500 4X4 HO 2001 -2005, RSE 2001, DUSE 2010 -2012. 2.Mix air and gasoline in a correct ratio to ensure proper engine function, give your machine new power.

offers a minimum one year, unlimited mileage warranty on most of parts sold, some are otherwise noted longer manufacturer Specifications. Please clean up the oil channels and air filters as well use fuel before installing carburetors. Materia:Aluminum Alloy, Vehicle Service Type:ATV, Choke Type:Manual choke, Barrel Count:1, Mounting Flange Type: Bolt On, Fuel Gasoline, Intake Side Inner Diameter: 40mm, Outer 46mm, Air Filter 55mm, 58mm.

1x Carburetor. Factory Warranty. 4.100% tested For reliability and performance, backed by satisfying after-sales service. Best Costumer Service.

Fast Shipping.

specifications carbthrotatv:

• for models: 400, 4x4, 500, Scrambler
• for makes: Polaris
• for years: 1999-2007
• brand: Bfo
• mpn: U2l5jr
• 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: 40mm
• intake side outer diameter: 46mm
• items included: Gasket, Mounting Hardware, O-rings
• machine type: Atv
• manufacturer warranty: 2 Years
• material: Alloy, Aluminum
• mounting flange type: Bolt On
• 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
• country of origin: China

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• class: Standard
• transit: 3-7 Days
• service: FedEx Ground / FedEx Home Delivery
• cost: $0.00
• carrier: FedEx
• type: Fixed

offer carbthrotatv:

• sold: 0
• availability: In Stock
• options: Ship-to-home
• best offers: True
• started: May 25, 2026
• quantity: 4

general carbthrotatv:

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

returns carbthrotatv:

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• time: 30 Days
• policy: Returns Accepted

seller carbthrotatv:

• city: Houston, Texas
• # reviews: 26700
• rating: 99.6%

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