1. Carburetors & Throttlebodies ATV For Sale
  2. sku: 17496852437575633
  3. SUPPLY MN/REG1

K-L SUPPLY MN-REG1 Carburetor Repair Big Lw Kit MN/REG1

fits model: Yfm400, 2x4, Bear. make: Yamaha. year: 2000–2004.

Reg1 K&l Supply Mn/reg1 Carburetor Repair Kit For 2000-2004 Yamaha Yfm400 Big Bear 2x4 - Lw

( Brand: K-l Supply ), ( Manufacturer Part Number: MN/REG1 ), ( Type: Carburetor Repair Kits ), ( Compatible Year: 2004 2003 2002 2001 2000 ), ( Compatible Model: Yfm400 Big Bear 2x4 ), ( Bundle Description: 1 Pc Genuine K L Supply Carburetor Repair Kits ), ( Core Charge: Free No Core Charge ), ( Fitment Type: Direct Replacement )

Review K L SUPPLY Mn/reg1 Carburetor Repair Kit Yamaha Big Lw fits BEAR YFM400 2X4 2000–2004

The **Supply MN/REG1 Carburetor Repair Kit** is a meticulously engineered, high-performance solution designed specifically for the **2000-2004 Yamaha YFM400 Big Bear LW** off-road motorcycle, ensuring optimal throttle response, fuel efficiency, and engine longevity. This premium repair kit is crafted to address common carburetor issues such as clogged jets, worn seals, or degraded internal components while maintaining the factory s precise tuning for reliable performance in rugged terrain. The kit includes a **comprehensive selection of OEM-quality parts**, including a **fresh set of gaskets and seals** (such as the pilot and main jet seals, throttle shaft seals, and carburetor-to-intake manifold gaskets) to prevent leaks and ensure a tight, airtight seal. For the **Supply MN carburetor**, the kit features **precision-machined needles and springs**, along with **clean, high-flow jets** (including the pilot, main, and transfer ports) that restore the carburetor s original calibration, allowing for smoother idle, better throttle progression, and improved cold-start reliability. The **REG1 carburetor variant** is also fully supported, with specialized components like the **idle mixture screw and throttle stop screw** included to fine-tune fuel delivery and prevent stalling or flooding. Additionally, the kit provides **dedicated cleaning tools**, such as a **carburetor brush and solvent-compatible parts**, to remove carbon buildup and varnish from critical passages without damaging sensitive components. Whether you're tackling a **rough idle, lean running, or inconsistent power delivery**, this repair kit offers a **turnkey solution** that aligns with Yamaha s engineering standards while accommodating aftermarket modifications for those seeking enhanced performance. With its **durable, corrosion-resistant materials** and **easy-to-install design**, this kit is ideal for both DIY enthusiasts and professional mechanics looking to restore their YFM400 s carburetor to peak condition, ensuring dependable power for years of off-road adventure.

**Pros and Cons of Buying a Supply MN/Reg1 Carburetor Repair Kit for a 2000-2004 Yamaha YFM400 Big Bear LW**

### **Pros:**

1. **Cost-Effective Solution** A repair kit is significantly cheaper than replacing the entire carburetor, especially if the carb itself is still in good condition. This makes it a practical choice for budget-conscious riders.

2. **DIY-Friendly** The YFM400 s carburetor is relatively straightforward to service compared to more complex setups. With basic tools and patience, an owner can perform the repair without professional labor costs.

3. **Improved Performance & Reliability** A properly cleaned and adjusted carburetor ensures better fuel mixture, smoother operation, and reduced risk of stalling or rough idling. This can extend the life of the engine and improve fuel efficiency.

4. **Preventative Maintenance** Regular carburetor maintenance (every 500 1,000 miles or as recommended) helps prevent clogs, carbon buildup, and long-term damage. A repair kit allows for thorough cleaning and adjustment of jets, needles, and passages.

5. **Availability of Parts** Supply MN and Reg1 kits are widely available online (e.g., from Supply Specialties, Amazon, or eBay) and often include gaskets, seals, and replacement components, making it easy to source everything needed.

6. **Compatibility & Fit** The YFM400 s carburetor is a standard Keihin SMFI (Single Meter Fuel Injection) unit, and these repair kits are designed specifically for it, ensuring proper fit and functionality.

7. **Long-Term Engine Health** A well-maintained carburetor reduces carbon deposits in the combustion chamber, which can lead to misfires, reduced power, and increased wear on spark plugs and pistons.

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### **Cons:**

1. **Time-Consuming Process** If the rider is inexperienced with carburetor work, the repair may take several hours to complete, especially if disassembly, cleaning, and reassembly require precision.

2. **Risk of Over-Tightening or Misassembly** Improperly reassembled carburetors can lead to leaks, poor fuel flow, or even damage to internal components. This risk is higher if the owner lacks experience with carburetor adjustments.

3. **Need for Cleaning Supplies** Beyond the repair kit, the owner must have carburetor cleaner, compressed air, and possibly a carburetor rebuild kit (for deeper cleaning). These additional costs can add up.

4. **Potential for Further Issues** If the carburetor has internal damage (e.g., cracked passages, seized needles) or if the engine has carbon buildup, simply repairing the carb may not fully resolve performance problems. In such cases, a full rebuild or replacement may still be needed.

5. **Learning Curve for Adjustments** Properly setting the idle mixture and jet sizes requires some tuning knowledge. An improperly adjusted carburetor can cause rich or lean conditions, leading to poor performance or engine damage.

6. **Warranty Concerns (If Applicable)** If the bike is under warranty, performing DIY carburetor work may void coverage for engine-related issues. Checking Yamaha s warranty terms is advisable before proceeding.

7. **Alternative Solutions Exist** For riders who prefer not to deal with carburetors, upgrading to a modern fuel-injected or aftermarket carburetor (e.g., Walbro, Mikuni) could be an option, though this involves higher upfront costs and potential compatibility issues.

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### **Conclusion & Recommendation**

A **Supply MN/Reg1 carburetor repair kit** is a **strong, cost-effective choice** for maintaining or restoring the performance of a 2000-2004 Yamaha YFM400 Big Bear LW, provided the owner is willing to invest the time and effort into proper cleaning and adjustment. The benefits improved reliability, better fuel economy, and preventative maintenance outweigh the drawbacks for most riders who are comfortable with basic mechanical work.

**Recommendation:**

- **If you are experienced with carburetors or willing to research and practice carefully**, purchasing a repair kit is the best way to keep your YFM400 running smoothly without breaking the bank.

- **If you lack confidence in carburetor work**, consider seeking help from a Yamaha dealer or a small-engine mechanic to avoid costly mistakes.

- **For long-term peace of mind**, pair the repair with regular maintenance (e.g., cleaning every 500 1,000 miles) to prevent future issues.

- **If performance problems persist after repair**, investigate other potential causes (e.g., fuel quality, spark plugs, or vacuum leaks) before concluding the carburetor is the sole issue.

Ultimately, the repair kit is the **most practical and economical solution** for this bike s carburetor needs, offering a balance of cost savings and effectiveness when executed correctly.

Details:

K L Supply Carburetor Repair Kit for 2000 - 2004 Yamaha YFM400 Big Bear 2X4 - lw: Status: In Stock.

part #: mnreg1 price

  • $35.71

specifications carbthrotatv:

  • for models: Yfm400, 2x4, Bear
  • for makes: Yamaha
  • for years: 2000-2004
  • brand: K-l Supply
  • mpn: Mn/reg1
  • type: Carburetor Repair Kits
  • compatible year: 2004 2003 2002 2001 2000
  • compatible model: Yfm400 Big Bear 2x4
  • bundle description: 1 Pc Genuine K L Supply Carburetor Repair Kits
  • core charge: Free No Core Charge
  • fitment type: Direct Replacement

general carbthrotatv:

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

shipping carbthrotatv:

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

offer carbthrotatv:

  • started: May 9, 2026
  • quantity: 1
  • availability: In Stock
  • options: Ship-to-home
  • sold: 0

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

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  • # reviews: 22467
  • city: Multiple warehouses
  • rating: 99.2%

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for models: yfm400, 2x4, bear, for makes: yamaha, for years: 2000-2004, type: carburetor repair kits, compatible year: 2004 2003 2002 2001 2000, compatible model: yfm400 big bear 2x4, bundle description: 1 pc genuine k l supply carburetor repair kits, core charge: free no core charge, fitment type: direct replacement,
category: atv parts > atv, side-by-side utv parts accessories > air intake fuel delivery > carburetors, sku: 17496852437575633,
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