Introduction
This manual provides essential information for the safe and effective operation, assembly, maintenance, and troubleshooting of your YIYIBYUS 52CC Gas Powered Multi-Tool. Please read this manual thoroughly before operating the equipment to ensure proper use and to prevent injury or damage.
The YIYIBYUS 52CC Multi-Tool is a versatile gardening tool designed for various tasks including string trimming, edging, hedge trimming, and brush cutting. It features a powerful 52cc two-stroke engine and comes with multiple interchangeable heads to adapt to different landscaping needs.
Safety Instructions
WARNING: Failure to follow these safety instructions may result in serious injury or death.
- Always wear appropriate personal protective equipment (PPE) including safety glasses, hearing protection, gloves, long pants, and sturdy footwear. Goggles are included for your protection.
- Ensure the work area is clear of bystanders, children, and pets. Maintain a safe distance from others.
- Inspect the tool before each use for loose parts, damage, or fuel leaks. Do not operate if damaged.
- Handle fuel with extreme care. Mix fuel in a well-ventilated area away from ignition sources. Do not smoke while refueling.
- Never operate the tool indoors or in poorly ventilated areas due to exhaust fumes.
- Turn off the engine and disconnect the spark plug wire before performing any maintenance, cleaning, or changing attachments.
- Be aware of kickback when using saw blades. Always maintain a firm grip on the handles.
- Do not operate the tool when fatigued, under the influence of alcohol, drugs, or medication.
- Store the tool in a dry, secure place, out of reach of children.
Components and Package Contents
Your YIYIBYUS 52CC Multi-Tool comes with a comprehensive set of components for various tasks. Please verify that all items listed below are present in your package.

Figure 1: Overview of all included components and attachments.
- Mainframe (Engine Unit)
- Carrying Strap
- Long Pole Saw Attachment
- Long Pole Hedge Trimmer Attachment
- Mower (String Trimmer Head)
- Grass Stopper (Guard)
- Funnel
- Front Handle
- Hedge Heating Head (likely a typo, refers to the hedge trimmer blade)
- 4* Aluminum Haymaking Rope (String Trimmer Line)
- 80T Saw Blade
- 3T Saw Blade
- 4T Saw Blade
- 8T Saw Blade
- 40T Alloy Saw Blade
- 2T Diamond-shaped Blade
- Goggles
- Guide Plate (for pole saw)
- Chain (for pole saw)
- Guide Plate Sleeve (for pole saw)
- English Instructions (this manual)
- All Accessories for Assembly (tools, etc.)

Figure 2: Close-up of various cutting blades and pole saw components with dimensions.
Setup and Assembly
Assembly is required for this multi-tool. Follow these steps carefully to assemble the unit and attach the desired cutting head.
1. Attaching the Handles and Shoulder Strap
- Attach the front handle to the main shaft. Ensure it is securely fastened for optimal control.
- Connect the shoulder strap to the designated attachment point on the main shaft. Adjust the strap length for comfortable and balanced operation.

Figure 3: Securely attach the front handle for proper grip.
2. Assembling the Main Unit and Shafts
- Connect the engine mainframe to the main shaft. The quick connector system allows for simpler installation and smoother transmission.
- If using pole extensions for the hedge trimmer or pole saw, connect them securely between the main shaft and the attachment head.
3. Attaching Cutting Heads
Select the appropriate cutting head for your task and attach it to the end of the shaft. Ensure all connections are tight and secure.
- String Trimmer/Edger: Attach the mower head with the aluminum haymaking rope. Secure the grass stopper (guard) above the head.
- Hedge Trimmer: Attach the long pole hedge trimmer attachment. Ensure the blade is properly aligned and secured.
- Pole Saw: Assemble the guide plate and chain onto the long pole saw attachment. Ensure the chain tension is correct.
- Brush Cutter Blades: For the 3T, 4T, 8T, 80T, or 2T diamond-shaped blades, attach them to the string trimmer head's mounting point, ensuring the correct washers and nuts are used to secure them firmly. Always use the appropriate guard for blade operation.

Figure 4: The multi-tool assembled in string trimmer configuration.
Operating Instructions
1. Fuel Mixture
This tool uses a 2-stroke engine and requires a specific fuel mixture. The recommended gasoline/circulating oil mixture ratio is 25:1.
- Use fresh, unleaded gasoline with an octane rating of 89 or higher.
- Use high-quality 2-stroke engine oil specifically designed for air-cooled engines.
- Mix the fuel and oil thoroughly in a separate, approved fuel container before pouring into the tool's fuel tank.
- The fuel tank capacity is 1000ml (0.9 Qt). The clear fuel tank allows for easy monitoring of fuel levels.
2. Starting the Engine
- Place the tool on a flat, stable surface.
- Ensure the spark plug wire is securely connected.
- Set the choke lever to the "START" or "CHOKE" position.
- Press the primer bulb several times until fuel is visible in the return line.
- Pull the starter rope firmly and steadily until the engine fires (usually 1-3 pulls). Do not pull the rope to its full extension.
- Once the engine fires, move the choke lever to the "RUN" position.
- If the engine does not start, repeat the process. If it floods, remove the spark plug, dry it, and try again with the choke off.

Figure 5: Main control handle with throttle and stop switch.
3. Operation with Attachments
Always maintain a firm grip on the tool with both hands. Use the shoulder strap to distribute weight and reduce fatigue.
- String Trimmer/Edger: Use for cutting grass and light weeds. Move the head in a sweeping motion. Keep the guard between you and the cutting line.
- Hedge Trimmer: Ideal for shaping hedges and shrubs. Use a smooth, even motion. Be mindful of the blade length (45cm/17.7in).
- Pole Saw: For cutting branches. The long rod saw length is 30cm/11.8in. Ensure the chain is properly lubricated. Use caution to avoid kickback.
- Brush Cutter Blades: Use for thicker brush and small saplings. Select the appropriate blade for the material. The 80T saw blade is suitable for denser vegetation. Always ensure the blade guard is in place.

Figure 6: Operating the multi-tool as a hedge trimmer.
4. Stopping the Engine
To stop the engine, simply press the "STOP" button located on the control handle. Allow the engine to cool down before storing.
Maintenance
Regular maintenance ensures the longevity and optimal performance of your multi-tool.
1. Air Filter Cleaning
The sponge air filter should be cleaned regularly, especially after prolonged use in dusty conditions. It can be repeatedly cleaned for long life.
- Remove the air filter cover.
- Carefully remove the sponge filter.
- Wash the filter with warm, soapy water, rinse thoroughly, and allow it to air dry completely.
- Apply a small amount of clean engine oil to the dry filter, then squeeze out any excess.
- Reinstall the filter and cover.
2. Spark Plug Inspection
Inspect the spark plug periodically for wear or carbon buildup. Clean or replace as necessary.
3. Blade and Trimmer Head Maintenance
- Blades: Keep all metal blades sharp and free of debris. Sharpen or replace dull or damaged blades.
- Hedge Trimmer: Lubricate the hedge trimmer blades after each use to prevent rust and ensure smooth operation.
- Pole Saw Chain: Ensure the chain is properly tensioned and lubricated with chain oil before and during use.
- String Trimmer: Replace the aluminum haymaking rope when it becomes too short or worn.
4. General Cleaning and Storage
- Clean the exterior of the tool after each use, removing grass, dirt, and debris.
- Check all nuts, bolts, and fasteners for tightness.
- For long-term storage, drain the fuel tank and run the engine until it stops to clear the carburetor of fuel. This prevents fuel degradation issues.
- Store the tool in a dry, well-ventilated area, away from direct sunlight and extreme temperatures.
Troubleshooting
This section provides solutions to common issues you might encounter.
| Problem | Possible Cause | Solution |
|---|---|---|
| Engine does not start | No fuel or incorrect fuel mixture; Choke not set correctly; Fouled spark plug; Engine flooded. | Check fuel level and mixture (25:1); Adjust choke; Clean/replace spark plug; Dry spark plug and try starting with choke off. |
| Engine runs, then stops | Lack of fuel; Clogged fuel filter; Clogged air filter. | Refuel; Clean/replace fuel filter; Clean air filter. |
| Loss of power during operation | Dull blade/trimmer line; Clogged air filter; Incorrect fuel mixture. | Sharpen/replace blade/line; Clean air filter; Verify fuel mixture. |
| Excessive vibration | Loose components; Damaged blade/trimmer head. | Check and tighten all fasteners; Inspect and replace damaged blade/head. |
| Smoke from engine | Too much oil in fuel mixture; Engine overheating. | Ensure correct 25:1 fuel mixture; Check for proper ventilation and clear cooling fins. Stop operation and allow to cool. |
Specifications
Detailed technical specifications for the YIYIBYUS 52CC Gas Powered Multi-Tool.

Figure 7: Key dimensions of the multi-tool.
| Feature | Specification |
|---|---|
| Brand | YIYIBYUS |
| Model | GD-9333 (Irrigation Cutter Model: MT520) |
| Engine Mode | 1E44F-5 |
| Engine Type | Air-cooled, 2-stroke, Single-cylinder Gasoline Engine |
| Engine Displacement | 52cc |
| Engine Power | 1.7kw, 6500-8500r/Min |
| Idling Speed | 2800-3200r/Min |
| Power Source | Gas Powered |
| Carburetor Type | Pump Membrane Type |
| Fuel Tank Capacity | 1000ml / 0.9Qt |
| Gasoline / Oil Mixture Ratio | 25:1 |
| Noise Level | 110dB |
| Blade Diameter (various) | 25cm / 9.8in (for round blades) |
| Hedge Cutting Length | 45cm / 17.7in |
| Long Rod Saw Length | 30cm / 11.8in |
| Net Weight | 15kg / 33lbs |
| Product Size (assembled) | 105*25*25cm / 41*9.8*9.8in |
| Assembly Required | Yes |
| Color | Red |
Warranty and Support
For information regarding product warranty, returns, or technical support, please refer to the seller or manufacturer's official website or contact their customer service directly. Keep your purchase receipt as proof of purchase.
This manual is intended as a guide. For specific issues not covered here, professional assistance may be required.