HX Carburetor for Arctic Cat ATV 400 (2005-2007)

1. Introduction

This manual provides detailed instructions for the installation, operation, and maintenance of your new HX Carburetor. Please read this manual thoroughly before installation and use to ensure proper function and longevity of the product. Retain this manual for future reference.

1.1 Safety Information

Always wear appropriate personal protective equipment (PPE) when working on your ATV. Ensure the engine is off and cool before beginning any installation or maintenance procedures. Disconnect the battery to prevent accidental starting. Fuel is highly flammable; work in a well-ventilated area away from open flames or sparks.

2. Product Overview

The HX Carburetor is designed as a replacement for specific Arctic Cat ATV 400 models. It is engineered to meet or exceed original equipment manufacturer (OEM) standards for performance.

2.1 Package Contents

• 1x Carburetor Assembly
• Fuel Filter
• Fuel Line
• Hose Clamps
• Carburetor Cleaning Brushes
• Additional small components (e.g., screws, gaskets)

Figure 2.1: Complete HX Carburetor assembly with included accessories. This image shows the main carburetor unit, a fuel filter, fuel line, hose clamps, and a set of cleaning brushes.

3. Compatibility

This HX Carburetor is compatible with the following Arctic Cat ATV 400 models:

• 2005-2006 Arctic Cat 400 Automatic Transmission 4x4 TBX
• 2006-2007 Arctic Cat 400 Automatic Transmission 4x4 FIS
• 2006-2007 Arctic Cat 400 Automatic Transmission 4x4 FIS LE
• 2006-2007 Arctic Cat 400 Automatic Transmission 4x4 TBX
• 2006-2007 Arctic Cat 400 Automatic Transmission 4x4 TRV
• 2006-2007 Arctic Cat 400 Manual Transmission 4x4 FIS

Note: Please verify your ATV's model and year before installation to ensure proper fitment. Refer to OEM part numbers 0470-537 and 0470-667 for cross-reference.

4. Installation Instructions

Professional installation is highly recommended due to the complexity of carburetor replacement and tuning. Incorrect installation can lead to engine damage or poor performance.

4.1 Preparation

1. Ensure the ATV engine is completely cool.
2. Disconnect the battery's negative terminal.
3. Turn off the fuel supply valve.
4. Place a suitable container under the carburetor to catch any spilled fuel.

4.2 Removal of Old Carburetor

1. Carefully disconnect all fuel lines, vacuum lines, and electrical connectors attached to the old carburetor. Note their positions for reinstallation.
2. Loosen the clamps securing the carburetor to the intake manifold and airbox.
3. Remove the throttle cable and choke cable (if applicable) from the carburetor.
4. Gently remove the old carburetor from the engine.

4.3 Installation of New Carburetor

1. Inspect the intake manifold and airbox boots for cracks or damage. Replace if necessary.
2. Position the new HX Carburetor into place, ensuring a snug fit into the intake manifold and airbox boots.
3. Secure the clamps on the intake manifold and airbox boots.
4. Reconnect the throttle cable and choke cable. Ensure smooth operation without binding.
5. Reconnect all fuel lines, vacuum lines, and electrical connectors to their correct positions. Use the new fuel filter provided.
6. Double-check all connections for tightness and proper routing.

Figure 4.1: Side view of the HX Carburetor, showing the throttle linkage and fuel inlet. This view is helpful for identifying connection points during installation.

Figure 4.2: Detailed views of the HX Carburetor, highlighting the float bowl and air intake. This image assists in understanding the internal components and air/fuel pathways.

5. Operating Instructions (Post-Installation)

5.1 Initial Start-up

1. Reconnect the battery's negative terminal.
2. Turn on the fuel supply valve.
3. Allow a few minutes for the carburetor float bowl to fill with fuel. Check for any leaks.
4. Engage the choke (if equipped and cold engine).
5. Start the ATV engine. It may take a few attempts to prime the fuel system.
6. Once started, allow the engine to warm up. Gradually disengage the choke as the engine warms.

5.2 Idle and Mixture Adjustment

After installation, the carburetor may require fine-tuning for optimal performance. This typically involves adjusting the idle speed screw and the air/fuel mixture screw.

• Idle Speed: Adjust the idle screw to achieve the manufacturer's recommended idle RPM for your ATV model.
• Air/Fuel Mixture: The mixture screw controls the fuel-to-air ratio at idle and low RPMs. Adjust in small increments (e.g., 1/4 turn) to find the smoothest idle and best throttle response. Turning the screw clockwise typically leans the mixture, counter-clockwise enriches it.

Caution: Improper tuning can lead to engine damage. If you are unfamiliar with carburetor tuning, consult a qualified mechanic.

6. Maintenance

Regular maintenance of your carburetor is essential for consistent performance and longevity.

6.1 Cleaning

• External Cleaning: Periodically clean the exterior of the carburetor to remove dirt and debris.
• Internal Cleaning: If performance issues arise (e.g., rough idle, poor acceleration), the carburetor may need internal cleaning. This involves disassembling the carburetor, cleaning jets and passages with carburetor cleaner and compressed air. Use the provided cleaning brushes for small passages.
• Fuel Filter Replacement: Replace the fuel filter regularly (e.g., annually or every 100 hours of operation) to prevent contaminants from reaching the carburetor.

Figure 6.1: Various components of the carburetor and the included cleaning brushes. Regular cleaning of these parts is crucial for optimal performance.

6.2 Storage

If the ATV will be stored for an extended period (e.g., over 30 days), it is recommended to drain the fuel from the carburetor float bowl or use a fuel stabilizer to prevent fuel degradation and gumming.

7. Troubleshooting

If troubleshooting steps do not resolve the issue, it is recommended to seek assistance from a qualified ATV mechanic.

8. Specifications

• Brand: HX
• Vehicle Service Type: ATV
• Flange Type: Bolt On
• Specific Uses For Product: Performance
• Manufacturer Part Number: 2005-2007 ATV 400cc (referring to fitment)
• Item Weight: Approximately 2.31 pounds
• Package Dimensions: Approximately 6.38 x 6.02 x 4.41 inches
• UPC: 754407642812

9. Warranty and Support

For any questions regarding installation, operation, or troubleshooting, please contact the seller or manufacturer directly. Refer to your purchase documentation for specific warranty terms and conditions.

Seller: CD-Parts

Support: 24 hour Service from CD-Parts