1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of the FTYHFEFH Carburetor Kit. This kit is designed as a direct replacement for Homelite SX135 and UT-20601 string trimmers, ensuring optimal performance and compatibility. It replaces OEM numbers A03002, A07139, A04445A, and various Walbro WT models including WT-220, WT-318, WT-363-1, WT-363X, WT-318X, WT-165, WT-71C, WT-220X, WT-363, WT-476-1, WT-476, and WT-458.
Please read this manual thoroughly before attempting any installation or maintenance to ensure safe and correct procedures.
2. Product Overview and Kit Contents
The FTYHFEFH Carburetor Kit includes a complete carburetor assembly and all necessary components for a straightforward replacement. The kit is designed for easy installation, reducing downtime and simplifying maintenance.
Figure 2.1: Complete FTYHFEFH Carburetor Kit contents. This image displays the main carburetor unit, fuel lines, gaskets, a spark plug, and an air filter, all included for a comprehensive replacement.
Figure 2.2: Close-up view of the FTYHFEFH Carburetor assembly. This image highlights the main body of the carburetor, showing its various ports and adjustment screws.
Figure 2.3: Side view of the FTYHFEFH Carburetor. This perspective clearly shows the primer bulb, which is essential for initial fuel delivery to the carburetor.
3. Safety Information
Always prioritize safety when working with power tools and fuel systems. Failure to follow safety instructions can result in serious injury or damage to equipment.
- Personal Protective Equipment (PPE): Always wear safety glasses, gloves, and appropriate clothing to protect against fuel, sharp edges, and moving parts.
- Engine Condition: Ensure the string trimmer engine is turned off, cool, and the spark plug wire is disconnected before performing any work. This prevents accidental starting.
- Ventilation: Work in a well-ventilated area when handling gasoline or other fuels to avoid inhaling fumes.
- Fuel Handling: Handle fuel with extreme care. Store fuel in approved containers away from heat sources and open flames. Do not smoke while handling fuel.
- Tool Use: Use the correct tools for each task. Do not force parts or use damaged tools.
4. Setup and Installation
This section outlines the steps for replacing the carburetor on your Homelite SX135 or UT-20601 string trimmer.
4.1. Preparation
- Ensure the string trimmer is on a stable, flat surface.
- Turn off the engine and allow it to cool completely.
- Disconnect the spark plug wire to prevent accidental starting.
- Drain any remaining fuel from the fuel tank into an approved container.
- Gather necessary tools: screwdriver set, pliers, wrench set, and a clean cloth.
4.2. Removal of Old Carburetor
- Locate the air filter cover and remove it. Then remove the air filter element.
- Carefully disconnect the fuel lines from the carburetor. Be prepared for a small amount of fuel spillage.
- Disconnect the throttle linkage and choke rod from the carburetor. Note their positions for reassembly.
- Unscrew the mounting bolts or nuts that secure the carburetor to the engine manifold.
- Gently pull the old carburetor away from the engine, ensuring all gaskets are removed.
4.3. Installation of New Carburetor
- Ensure the mounting surface on the engine is clean and free of old gasket material.
- Place new gaskets (included in the kit) in their correct positions on the engine manifold and carburetor.
- Position the new FTYHFEFH carburetor onto the mounting studs/bolts.
- Secure the carburetor with the mounting bolts/nuts, tightening them evenly to prevent air leaks. Do not overtighten.
- Reconnect the throttle linkage and choke rod to the new carburetor. Ensure they move freely.
- Connect the new fuel lines (if replacing) to the appropriate ports on the carburetor and fuel tank. Refer to your trimmer's service manual for correct routing if unsure.
- Install the new air filter and replace the air filter cover.
- Install the new spark plug (if included and replacing) and reconnect the spark plug wire.
5. Operating (Initial Start-up)
After installation, follow these steps for the initial start-up of your string trimmer.
- Fueling: Fill the fuel tank with the correct fuel mixture (gasoline and 2-stroke oil, as specified by your trimmer's manufacturer).
- Priming: Press the primer bulb several times until fuel is visible in the bulb and flows freely, indicating the carburetor is primed.
- Choke: Move the choke lever to the FULL CHOKE position.
- Starting: Pull the starter rope firmly and steadily until the engine attempts to start (usually 1-3 pulls).
- Partial Choke: Once the engine attempts to start, move the choke lever to the HALF CHOKE or RUN position.
- Restart: Pull the starter rope again until the engine starts and runs smoothly.
- Warm-up: Allow the engine to warm up for a minute or two before engaging the throttle.
Note: This carburetor is typically pre-adjusted for standard operation. If fine-tuning is required, consult a qualified service technician or your trimmer's original service manual for specific adjustment procedures (idle speed, high-speed mixture).
6. Maintenance
Regular maintenance ensures the longevity and optimal performance of your string trimmer and its new carburetor.
- Air Filter: Inspect and clean the air filter regularly (after every 5-10 hours of operation, or more frequently in dusty conditions). Replace if damaged or excessively dirty.
- Fuel Filter: Check the fuel filter (located inside the fuel tank) periodically for clogs or debris. Replace it annually or if fuel flow is restricted.
- Spark Plug: Inspect the spark plug annually or every 50 hours of operation. Clean or replace if electrodes are fouled or worn.
- Fuel Lines: Inspect fuel lines for cracks, leaks, or hardening. Replace as needed to prevent fuel system issues.
- Storage: For extended storage, drain all fuel from the tank and run the engine until it stops to clear the carburetor of fuel. This prevents gumming and starting issues.
7. Troubleshooting
If you encounter issues after installing the new carburetor, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Engine won't start | No fuel in carburetor | Ensure fuel tank has fresh fuel, prime carburetor. |
| Spark plug issue | Check spark plug for fouling or damage; replace if necessary. Ensure spark plug wire is connected. | |
| Choke setting incorrect | Ensure choke is in the correct position for starting. | |
| Engine runs rough or stalls | Air filter clogged | Clean or replace air filter. |
| Fuel filter clogged | Replace fuel filter. | |
| Incorrect fuel mixture | Use fresh, correctly mixed fuel. | |
| Lack of power | Air filter clogged | Clean or replace air filter. |
| Carburetor adjustment needed | Consult a qualified technician for carburetor adjustments if necessary. |
8. Specifications
- Product Type: Carburetor Kit
- Brand: FTYHFEFH
- Compatibility: Homelite SX135, Homelite UT-20601 String Trimmers
- Replaces OEM Part Numbers: A03002, A07139, A04445A
- Replaces Walbro WT Models: WT-220, WT-318, WT-363-1, WT-363X, WT-318X, WT-165, WT-71C, WT-220X, WT-363, WT-476-1, WT-476, WT-458
9. Warranty and Support
For warranty information regarding your FTYHFEFH Carburetor Kit, please refer to the documentation provided at the time of purchase or contact your retailer directly. Specific warranty terms and conditions may vary.
For technical support or further assistance, please contact the manufacturer or your authorized service provider. Always provide your product model and purchase details when seeking support.