MIKUNI 3131199 Carburetor Carb

( Brand: Mikuni ), ( Manufacturer Part Number: 3131199 ), ( Part Type: Carburetor )

Review MIKUNI Polaris Carburetor Carb fits MAGNUM 500 4X4 2000

The **Mikuni 3131199 Polaris Magnum 500 4x4 Carburetor** is a precision-engineered, high-performance fuel delivery system meticulously crafted for the iconic Polaris Magnum 500 4x4, designed to elevate throttle response, power output, and overall engine efficiency. This carburetor represents the pinnacle of Mikuni s engineering expertise, combining a robust yet lightweight aluminum body with a smooth-bore design that ensures optimal airflow and fuel atomization. The **3131199 model** features a **19mm throttle bore**, a dimension carefully calibrated to match the Magnum 500 s displacement and performance requirements, allowing for a balanced mix of power and drivability. Its **floating needle and jet system** provides precise fuel metering, adapting seamlessly to varying throttle positions while minimizing fuel waste and maximizing combustion efficiency. The carburetor s **dual-piston diaphragm** mechanism delivers consistent vacuum control, ensuring smooth idle stability and quick acceleration, even under demanding off-road conditions where sudden power demands are common. Built with **high-grade stainless steel components**, including the needle and jets, this carburetor resists corrosion and wear, guaranteeing long-term reliability in the harshest environments. The **Mikuni logo** is subtly integrated into the design, a testament to the brand s reputation for innovation and performance in the ATV and off-road power equipment industry. Whether tackling rugged trails or cruising on paved roads, the **3131199 carburetor** enhances the Magnum 500 s already formidable performance, offering a blend of responsiveness, durability, and ease of maintenance that enthusiasts and professionals alike can trust. For those seeking to fine-tune their Polaris for peak performance, this carburetor stands as a superior choice, delivering both power and precision with every rev.

**Pros and Cons of buying a Mikuni 3131199 Polaris Magnum 500 4x4 Carburetor**

The Mikuni 3131199 carburetor is designed specifically for the Polaris Magnum 500 4x4 series, offering improved performance and reliability for off-road applications. Below is a detailed breakdown of its advantages and disadvantages.

### **Pros**

1. **OEM Replacement Quality** This carburetor is an exact factory replacement part, ensuring compatibility with the original engine setup. It maintains the same specifications as the original Mikuni carburetor used in the Magnum 500, reducing the risk of performance issues or drivability problems.

2. **Enhanced Fuel Efficiency and Performance** The Mikuni 3131199 is engineered to optimize fuel-air mixture, which can improve throttle response, power delivery, and overall engine efficiency. Many users report smoother acceleration and better low-end torque compared to aftermarket alternatives that may not be as finely tuned.

3. **Durability and Reliability** Mikuni is a well-respected brand in the off-road and ATV industry, known for producing high-quality carburetors that withstand the demands of rugged use. This carburetor is built to handle the stresses of frequent starts, cold weather, and rough terrain without excessive wear.

4. **Ease of Installation and Maintenance** As an OEM part, it fits seamlessly into the existing carburetor setup without requiring extensive modifications. It also shares common maintenance procedures with the original carburetor, making cleaning, jetting adjustments, and repairs straightforward for mechanics familiar with Mikuni systems.

5. **Better Cold-Weather Performance** The Mikuni 3131199 is designed to handle cold starts more effectively than some aftermarket carburetors, which may struggle with fuel starvation or inconsistent idle in low temperatures. This is particularly useful for riders in colder climates.

6. **Consistency with Stock Tuning** If you plan to keep your ATV stock-tuned or only make minor modifications, this carburetor ensures that your engine behaves predictably. It avoids the potential tuning headaches that can arise from switching to aftermarket carburetors that may require extensive adjustments to jetting, ignition timing, or exhaust systems.

7. **Wider Availability of Parts and Support** Since it is an OEM part, Mikuni and Polaris dealerships often carry it, making repairs and replacements easier. Additionally, there is a wealth of online resources, forums, and tutorials dedicated to Mikuni carburetors, providing troubleshooting guidance and community support.

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### **Cons**

1. **Limited Performance Gains Over Stock** While the Mikuni 3131199 is a solid replacement, it does not offer significant power increases compared to the original carburetor. If your goal is to maximize horsepower or torque, you may need to pair it with other modifications (such as a high-flow air filter, upgraded exhaust, or ECU tuning), which are not inherently supported by the carburetor alone.

2. **Potential for Clogging in Dirty Environments** Like all carburetors, the Mikuni 3131199 can become clogged with dirt, dust, or debris if the air filter is inadequate or not maintained properly. Off-road riders who frequently operate in dusty conditions must ensure regular cleaning and filter changes to prevent performance degradation.

3. **Cost Compared to Aftermarket Alternatives** While the Mikuni 3131199 is reasonably priced for an OEM part, some aftermarket carburetors (such as Keihin or Walbro models) may offer comparable performance at a lower cost. However, these alternatives often require additional tuning and may not fit as cleanly into the stock setup.

4. **Jetting Sensitivity** Mikuni carburetors are known for their precise jetting, which can be both an advantage and a disadvantage. If you are not experienced with carburetor tuning, making adjustments to the jets (pilot, main, or power jets) can be tricky and may result in unintended consequences, such as lean mixtures, rough idling, or poor cold starts.

5. **No Upgraded Features for Modern Tuning** If you plan to integrate your ATV with modern performance modifications (e.g., ECU remapping, turbocharging, or forced induction), the Mikuni 3131199 may not be the best long-term solution. These upgrades often require carburetors with higher flow rates or electronic fuel injection systems for optimal performance.

6. **Dependence on Fuel Quality** Like all carburetors, the Mikuni 3131199 performs best with clean, high-quality fuel. Poor fuel quality (e.g., ethanol-blended gas with additives that gum up carburetor components) can lead to clogging, reduced performance, and increased wear over time.

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### **Conclusion**

The Mikuni 3131199 carburetor is an excellent choice for riders seeking a reliable, high-quality replacement for their Polaris Magnum 500 4x4. It offers the peace of mind of an OEM part with proven durability, consistent performance, and ease of maintenance. It is particularly well-suited for those who prioritize stock-like reliability, cold-weather operation, and straightforward upkeep without the need for extensive modifications.

However, if your primary goal is to push the limits of power output or integrate your ATV with advanced tuning systems, you may need to explore aftermarket options or consider upgrading to a more aggressive carburetor or fuel injection system. For most riders who want a balance of performance, reliability, and simplicity, the Mikuni 3131199 is a strong recommendation.

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### **Recommendation**

- You want an exact OEM replacement with no compatibility issues.

- You prioritize reliability, cold-weather performance, and ease of maintenance.

- You plan to keep your ATV stock-tuned or make only minor modifications.

- You are comfortable with basic carburetor tuning and maintenance.

- You operate in environments where fuel quality and air filter cleanliness can be controlled.

- You are looking for significant power gains and are willing to invest in additional modifications (e.g., air intake, exhaust, or ECU tuning).

- You prefer aftermarket carburetors that may offer better flow rates or lower cost.

- You plan to experiment with forced induction or aggressive performance upgrades in the future.

For the average Polaris Magnum 500 4x4 owner, the Mikuni 3131199 carburetor is a safe, effective, and well-supported choice that delivers consistent performance without unnecessary complexity. Pair it with a high-quality air filter, regular maintenance, and clean fuel for the best results.

Details:

Items are shipped using USPS, UPS, and FedEx. Comes as pictured. Has light wear. Could use a quick cleaning.

Carburetor is in good condition. Was removed from a 2000 Polaris Magnum 500 4X4.

part #: 3131199 prices

• $175.00-$244.50

specifications carbthrotatv:

• for models: 500, 4x4, Magnum
• for makes: Polaris
• for years: 2000
• brand: Mikuni
• mpn: 3131199
• part type: Carburetor

offer carbthrotatv:

• sold: 0
• started: March 14, 2026
• availability: In Stock
• options: Ship-to-home
• quantity: 1
• best offers: True

shipping carbthrotatv:

• type: Fixed
• transit: 4-7 Days
• class: Standard
• service: Standard
• cost: $0.00

general carbthrotatv:

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

seller carbthrotatv:

• # reviews: 98965
• rating: 99.8%
• city: Ashaway, Rhode Island

payments carbthrotatv:

• credit card: Diners-club
• wallet: Google-pay
• other

returns carbthrotatv:

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

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