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  3. CELOX AC2378CA139JI

CELOX AC2378CA139JI Carburetor Fm

fits model: Trx450es, 450, Fourtrax, Foreman. make: Honda. year: 1999–2004.

Ac2378ca139ji Celox Carburetor For Honda 450 Trx450es Fe Fm S Fourtrax Foreman 1999-2004

( Brand: Celox ), ( Manufacturer Part Number: AC2378CA139JI ), ( California Prop 65 Warning: Proposition 65 Warning For California Consumers. ), ( Type: Carburetor ), ( Warranty: 90 Day ), ( Country Of Origin: China )

Review CELOX Carburetor Honda Fe Fms fits FOURTRAX FOREMAN TRX450ES 450 1999–2004

The **CELOX AC2378CA139JI Carburetor** is a meticulously engineered, high-performance replacement part designed specifically for Honda s legendary **TRX450R FourTrax Rancher, TRX450ES FourTrax Foreman, and TRX450FE FourTrax Foreman** models produced between **1999 and 2004**. Crafted to meet the demanding needs of off-road enthusiasts who demand reliability, precision, and raw power, this carburetor is a direct-fit, OEM-quality alternative that ensures seamless integration with your Honda s fuel delivery system. Built with **high-grade aluminum and precision-machined components**, the CELOX carburetor maintains the exact specifications of the original unit, including the **23.78mm throttle bore** and **CA139JI model designation**, guaranteeing optimal airflow and throttle response for both on-trail and high-performance applications. Whether you're tackling rugged terrain, pushing your ATV to its limits, or simply restoring your machine to factory specs, this carburetor delivers the perfect balance of fuel efficiency and throttle control. Its **durable construction** and **tight tolerances** ensure minimal carbon buildup and consistent performance, while the **easy-to-service design** allows for quick adjustments and maintenance, keeping your engine running smoothly for years to come. Ideal for both stock and modified setups, the CELOX carburetor is a trusted choice among mechanics and riders who refuse to compromise on quality offering a reliable upgrade or exact replacement that restores your Honda s original performance with minimal hassle.

### **Pros and Cons of buying a Celox AC2378CA139JI Carburetor for a 1999 2004 Honda 450 TRX450ES/FE/FMS FourTrax Foreman**

#### **Pros:**

1. **OEM Replacement Quality** The Celox carburetor is designed as a direct replacement for the stock Honda carburetor, ensuring proper fitment and functionality without requiring major modifications.

2. **Reliability** Celox is a well-regarded brand in the off-road and ATV industry, known for producing durable carburetors that maintain performance under demanding conditions.

3. **Performance Consistency** This carburetor is tuned to match the stock Honda specifications, meaning it should provide smooth, reliable power delivery without excessive tuning or adjustments.

4. **Ease of Installation** Since it s a direct drop-in replacement, installation is straightforward, requiring only basic tools and minimal disassembly of the carburetor assembly.

5. **Availability of Parts** Celox carburetors come with gaskets, seals, and sometimes jets, reducing the need for additional aftermarket purchases to complete the installation.

6. **Cost-Effective Upgrade** Compared to high-end aftermarket carburetors, this option offers a balance between performance and affordability, making it a practical choice for stock or lightly modified engines.

7. **Compatibility with Stock Tuning** If you plan to keep the engine stock or make only minor modifications (e.g., slight camshaft upgrades), this carburetor will integrate well without requiring aggressive tuning.

#### **Cons:**

1. **Limited Performance Gains** Unlike high-flow aftermarket carburetors, this is a stock-replacement unit, meaning it won t significantly increase horsepower or throttle response beyond the stock configuration.

2. **No Adjustability** The Celox AC2378CA139JI is a fixed-jet carburetor, meaning you won t have the ability to fine-tune fuel mixture or airflow for specific conditions (e.g., high-altitude or aggressive tuning).

3. **Potential for Clogging** Like all carburetors, it can become clogged over time with dirt, fuel deposits, or varnish, requiring periodic cleaning or maintenance to maintain optimal performance.

4. **Dependence on Fuel Quality** Poor-quality fuel (e.g., ethanol-blended gas with additives) can accelerate wear or clogging, potentially reducing the carburetor s lifespan.

5. **No Upgrade Path** If you later decide to modify the engine (e.g., bigger carburetor, turbocharging, or aggressive camshafts), this carburetor may become a bottleneck, requiring a full replacement.

6. **Potential for Stock Issues** If the original Honda carburetor had pre-existing problems (e.g., worn seals, cracked body), the Celox unit may inherit the same issues unless the entire assembly is thoroughly inspected and cleaned during installation.

7. **Limited Aftermarket Support** Unlike some high-end carburetors, Celox does not offer extensive tuning guides or community support for aggressive modifications, which could be a drawback if you re experimenting with performance upgrades.

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### **Conclusion and Recommendation**

The **Celox AC2378CA139JI carburetor** is an excellent **direct replacement option** for your 1999 2004 Honda 450 FourTrax Foreman if you prioritize **reliability, ease of installation, and stock-like performance**. It s ideal for riders who want to **restore or maintain stock power** without investing in a high-end aftermarket carburetor. However, if you re planning **aggressive modifications** (e.g., big cams, forced induction, or significant power increases), this carburetor will quickly become a limiting factor and may need to be replaced sooner rather than later.

#### **Recommendation:** - **Buy the Celox carburetor if:**

- You want a **direct OEM replacement** with minimal tuning required.

- Your goal is **reliability and stock performance** without major modifications.

- You re on a **budget** and want a quality aftermarket option that s easier to source than a Honda OEM part.

- You plan to **keep the engine stock or make only minor upgrades** (e.g., slight camshaft swaps, minor exhaust changes).

- **Consider an aftermarket carburetor (e.g., Walbro, Keihin, or Mikuni) if:**

- You re **aggressively modifying the engine** (e.g., turbocharging, big cams, or significant power increases).

- You want **adjustability** for fine-tuning fuel mixture or airflow.

- You re running **high-performance applications** (e.g., racing, heavy-duty terrain) where stock carburetor limitations are a concern.

- **Additional Tips for Installation:**

- **Clean the carburetor thoroughly** before installation to remove old fuel deposits or debris.

- **Replace all seals and gaskets** to ensure a proper seal and prevent leaks.

- **Use high-quality fuel additives** (e.g., Seafoam or carburetor cleaner) to help maintain cleanliness.

- **Monitor performance** after installation if the bike runs poorly, it may require a **basic tune-up** (e.g., adjusting idle speed, checking for vacuum leaks).

In summary, the Celox carburetor is a **solid, no-frills choice** for stock or lightly modified Honda 450 Foremans, but it s not the best long-term solution for serious power upgrades. If you re happy with stock power, it s a **reliable and cost-effective** option.

Details:

Premium Quality Replacement Part, Carburetor. Order Includes: 1x Carburetor: 16100-HN0-A00 16100-HN0-A02. TRX450ES FOREMAN 1998 -2001. length : 95mm.

TRX450S FOREMAN 1998 -2001. For Honda model's.

specifications electricacompone:

  • for models: Trx450es, 450, Fourtrax, Foreman
  • for makes: Honda
  • for years: 1999-2004
  • brand: Celox
  • mpn: Ac2378ca139ji
  • california prop 65 warning: Proposition 65 Warning For California Consumers.
  • type: Carburetor
  • warranty: 90 Day
  • country of origin: China

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  • ATV, Side-by-Side UTV Parts Accessories > Electrical Ignition Components > Other Electrical Ignition Components

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  • started: June 11, 2026
for models: trx450es, 450, fourtrax, foreman, for makes: honda, for years: 1999-2004, california prop 65 warning: proposition 65 warning for california consumers., type: carburetor, warranty: 90 day, country of origin: china,
category: atv parts > atv, side-by-side utv parts accessories > electrical ignition components, sku: 25536497893699603,
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