1. Carburetors & Throttlebodies ATV For Sale
  2. sku: 17507017469205752
  3. SIGMA 764150853038-1

6 SIGMA 764150853038-1 Atv Mongoose Cv Carburetor Carb Jet 1/3 Kit

fits model: 300. make: Kymco.

764150853038-1 6 Sigma Kymco Atv Mongoose 300 Custom Cv Carburetor Carb Stage 1-3 Jet Kit

( Brand: 6 Sigma ), ( Choke Type: Mechanical ), ( Type: Carburetor ), ( Machine Type: Atv ), ( Manufacturer Warranty: Lifetime ), ( Features: Jetting ), ( Country Of Origin: United States ), ( UPC: 764150853038 ), ( EAN: 7641508530381 )

Review 6 SIGMA Kymco Atv Mongoose Custom Cv Carburetor Carb Stage 1-3 Jet Kit fits 300

The **Sigma 764150853038-1 Kymco ATV Mongoose 300 CV Carburetor Jet Kit (1-3 Jet Kit)** is a precision-engineered performance upgrade designed specifically for the Kymco Mongoose 300 CV carburetor, ensuring optimal fuel delivery, enhanced throttle response, and improved overall engine efficiency. This meticulously crafted kit includes a complete set of high-quality jets tailored to fine-tune the carburetor s air-fuel mixture, allowing riders to achieve a balance between power, smoothness, and fuel economy. Ideal for both stock and modified applications, this jet kit is crafted from durable, corrosion-resistant materials that maintain consistent performance under varying riding conditions, from light trail riding to more demanding off-road adventures. The 1-3 jet configuration provides versatility, enabling riders to adjust the carburetor s settings for different altitudes, fuel types, or riding styles whether seeking a slightly richer mixture for better cold-start performance or a leaner setup for improved throttle response and fuel efficiency. Perfect for DIY enthusiasts or professional mechanics, this kit simplifies carburetor tuning, ensuring a cleaner, more reliable engine operation with reduced carbon buildup and extended carburetor life. Whether upgrading for better performance, troubleshooting engine issues, or simply maintaining peak carburetor health, the Sigma jet kit delivers a straightforward, effective solution that aligns with Kymco s engineering standards while offering the flexibility to fine-tune the Mongoose 300 CV s carburetor for optimal results.

### **Pros and Cons of buying a Sigma 764150853038-1 Kymco ATV Mongoose 300 CV Carburetor Carb Kit (1-3 Jet Kit)**

#### **Pros:**

1. **Compatibility** This kit is specifically designed for the Kymco Mongoose 300 CV carburetor, ensuring a proper fit without modifications. This reduces the risk of installation errors that could damage the engine.

2. **Performance Tuning Potential** A jet kit allows for adjustments to fuel-air mixture, which can improve throttle response, power delivery, and overall engine efficiency. Depending on the terrain and riding conditions, you may achieve better performance than stock settings.

3. **Cost-Effective Upgrade** Compared to full engine rebuilds or high-end performance kits, a carburetor jet kit is relatively inexpensive. It provides a straightforward way to fine-tune the engine without major mechanical work.

4. **Easy Installation** Most carburetor jet kits are designed for DIY installation, requiring only basic tools. The process typically involves removing the old jets, cleaning the carburetor, and installing the new ones no welding, machining, or professional labor is usually required.

5. **Adjustability** The 1-3 jet kit suggests multiple jet sizes (likely for pilot, main, and power jets), allowing you to experiment with different fuel mixtures. This flexibility can help optimize performance for different conditions, such as cold starts, high altitudes, or aggressive riding.

6. **Maintenance and Reliability** A clean, properly adjusted carburetor reduces the risk of fouling, stalling, or poor fuel efficiency. If the stock jets were worn or clogged, replacing them can restore the engine to near-optimal condition.

7. **Brand Reputation** Sigma is a well-known manufacturer of performance parts for ATVs and small engines. Their products are generally reliable, and the carburetor kits are often used by tuners and enthusiasts for their consistency.

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#### **Cons:**

1. **Learning Curve for Tuning** While the kit is easy to install, achieving the best performance requires understanding how jet sizes affect the engine. Incorrect adjustments (e.g., too lean or too rich) can lead to poor power, overheating, or even engine damage. Beginners may need to experiment or consult tuning guides.

2. **Limited Performance Gains** Unlike modern fuel-injected or turbocharged engines, carbureted ATVs have inherent limitations. A jet kit can improve stock performance, but it may not deliver dramatic power increases. For significant upgrades, other modifications (e.g., exhaust, clutch, or engine tuning) may be necessary.

3. **Potential for Voiding Warranty** If your Kymco Mongoose 300 CV is still under warranty, modifying the carburetor with aftermarket parts could void coverage. Always check the warranty terms before proceeding.

4. **Fuel Quality Dependency** Carbureted engines are sensitive to fuel quality. If you use low-grade or contaminated fuel, even a well-tuned carburetor may perform poorly or suffer damage. High-quality fuel (e.g., ethanol-free or premium) is recommended.

5. **Environmental and Emissions Concerns** Some regions have emissions regulations that may restrict aftermarket carburetor tuning. If you ride in areas with strict environmental laws, you may need to revert to stock jets or use a catalytic converter-compatible kit.

6. **Risk of Over-Tuning** Aggressive tuning (e.g., using too lean jets) can lead to engine knocking, overheating, or long-term damage. This is especially true for older or high-mileage engines that may not handle increased stress well.

7. **No Guarantee of Perfect Fit** While Sigma kits are generally reliable, there is a slight chance of compatibility issues if the carburetor has been previously modified or if there are manufacturing inconsistencies. Always inspect the kit upon arrival.

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### **Conclusion**

The Sigma 764150853038-1 Kymco Mongoose 300 CV carburetor jet kit is a practical and affordable way to fine-tune your ATV s performance if you re comfortable with basic mechanical work and tuning. It offers clear benefits for riders looking to optimize throttle response, fuel efficiency, and reliability without a major overhaul. However, it requires an understanding of carburetor tuning to avoid pitfalls like poor performance or engine damage.

For **casual riders** or those new to carburetor tuning, this kit is a worthwhile investment if used cautiously. For **serious off-roaders or performance enthusiasts**, it may serve as a stepping stone before exploring more advanced modifications (e.g., high-flow carburetors, exhaust upgrades, or electronic fuel injection).

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### **Recommendation**

- **Buy if:** You want a simple, cost-effective way to improve your Kymco Mongoose 300 CV s performance, you re willing to learn basic tuning principles, and you have access to clean fuel. Start with the stock or slightly richer jets to avoid issues.

- **Avoid if:** You re not comfortable with minor engine adjustments, your ATV is still under warranty, or you expect dramatic power gains without additional modifications.

- **Additional Tips:**

- Research tuning guides specific to the Kymco Mongoose 300 CV before purchasing.

- Consider pairing this kit with a carburetor cleaner or rebuild kit to ensure optimal performance.

- If you plan to ride aggressively, monitor the engine for signs of overheating or rough idling after installation.

- For best results, pair this with other performance upgrades (e.g., clutch kit, exhaust) if you re aiming for significant power increases.

Ultimately, this kit is a solid choice for riders seeking a balance between affordability and performance tuning, provided it is used responsibly.

Details:

Feel it still needs more on the top end, low mid range after installing. Top notch kit. If you notice any exhaust popping, pinging, or pipe discoloration, are extremely lean. I installed your jet kit per instructions and my surging problem is gone.

Step by step instructions with photos for ease of installation. Please feel free to use this testimonial in any way that you fit. Its really helped out with the entire rev range and idles alto cooler than before. Needle Adjusters.

Drill Bits for. EVERY Kit Custom Engineered Time. Riding Elevation height above sea level, and any extreme conditions. The bike is a full on wheelie machine.

It is easy, just take it slow and pay attention. Carb Synchronize Tool how to build for $5. Slide Hole Modification optional. Roared to life and growled like a angry beast - awesome.

Hi guys, just wanted to say thanks. It feels like a whole new bike. 6Sigma Jet Kits provide the parts and installation instructions to enrich/modify all circuits in carb, fix this problem, add performance you can actually feel seat. This Kit is for all throttle positions, and response.

This is a carb jet kit, to get everything out of your bike, that it can give. Not to be confused with a basic rebuild kit. Completely eliminated the bog issue I was having. Thanks a gazillion for the huge improvement.

Unbelievable improvement in acceleration. Designed to improve all RPM ranges of performance and a quicker throttle response, helps remove the bog. Designed to gain a safe 8%-10% in HP with intake/exhaust, 3-4% on bone stock. Very easy installation, too.

Each kit is Custom Engineered by 6Sigma to your bike and its modifications. I now have the means and knowledge to be able re-jet in future IE. Customer Reviews. These are signs of a LEAN ENGINE, Jet Kit will fix those issues.

Modifications engine, exhaust, intake, filter type etc. WOW, what a great fix. The best part - it purred like a kitten while cruising down the highway, and idled same at lights. The best part was when the light changed from red to green.

Hey I just thought I'd let you know that after installing your kit my super tenure is a completely new bike. Jet Kit Includes. What a difference. Nylon Needle Spacers.

Excellent instructions and value once again. Installation, The kit comes with complete instructions for installation. When I add less restrictive pipe. Carb Schematic.

Runs perfect. Idle Mixture Modification. Slide Spring Modification. Hi, just wanted to say thanks.

part #: 764150853038 price

  • $39.50

specifications carbthrotatv:

  • for models: 300
  • for makes: Kymco
  • brand: 6 Sigma
  • choke type: Mechanical
  • type: Carburetor
  • machine type: Atv
  • manufacturer warranty: Lifetime
  • features: Jetting
  • country of origin: United States
  • upc: 764150853038
  • ean: 7641508530381

general carbthrotatv:

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

shipping carbthrotatv:

  • carrier: USPS
  • type: Fixed
  • class: Standard, Expedited
  • service: USPS First Class, USPS Priority Mail, USPS Priority Mail Express
  • transit: 3-8 Days
  • cost: $0.00

offer carbthrotatv:

  • quantity: 1
  • availability: In Stock
  • sold: 0
  • options: Ship-to-home
  • started: May 12, 2026

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  • credit card: Diners-club
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seller carbthrotatv:

  • city: Phoenix, Arizona
  • # reviews: 44931
  • rating: 100.0%

returns carbthrotatv:

  • policy: Returns Accepted
  • time: 30 Days
  • paid by: Seller
for models: 300, for makes: kymco, choke type: mechanical, type: carburetor, machine type: atv, manufacturer warranty: lifetime, features: jetting, country of origin: united states, ean: 7641508530381,
category: atv parts > atv, side-by-side utv parts accessories > air intake fuel delivery > carburetors, sku: 17507017469205752,
6 Sigma 764150853038-1 Is Similar To:
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1 offer $39.50 USD
  • New. Offer #1 priced at $39.50 + $0.00 shipping estimate = $39.50* total. This is a carb jet kit, to get everything out of your bike, that it can give. Each kit is Custom Engineered by 6Sigma to your bike and its modifications.FREE SHIPPING

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