1. Introduction
This manual provides essential information for the safe and efficient operation, maintenance, and troubleshooting of your FOGGBET 15HP 4-Stroke Air-Cooled Gasoline Engine. Please read this manual thoroughly before operating the engine to ensure proper usage and to prevent injury or damage.

Figure 1: FOGGBET 15HP 4-Stroke Air-Cooled Gasoline Engine
Product Overview Video
Video 1: Overview of the FOGGBET 15HP 4-Stroke Air-Cooled Gasoline Engine (Red variant).
Video 2: Detailed view of the FOGGBET 15HP 4-Stroke Gas Engine (Red variant).
Video 3: Overview of the FOGGBET 15HP 4-Stroke Gas Engine (Black variant).
2. Safety Information
Always prioritize safety when operating or maintaining the engine. Failure to follow safety instructions can result in serious injury or property damage.
- Read the Manual: Understand all instructions and warnings before use.
- Ventilation: Operate the engine in a well-ventilated area to avoid carbon monoxide poisoning. Never operate indoors.
- Fuel Safety: Gasoline is highly flammable. Refuel in a well-ventilated area with the engine off and cool. Avoid spilling fuel.
- Hot Surfaces: The engine and exhaust system become very hot during operation and remain hot for a period afterward. Avoid contact to prevent burns.
- Moving Parts: Keep hands, feet, and clothing away from moving parts to prevent entanglement.
- Personal Protective Equipment (PPE): Wear appropriate safety gear, including eye protection, gloves, and hearing protection.
- Children and Pets: Keep children and pets away from the engine, especially during operation.
3. Setup
3.1 Unpacking and Inspection
Carefully remove the engine from its packaging. Inspect for any shipping damage. Ensure all components listed in the packing list are present.
3.2 Checking and Adding Engine Oil
The engine is shipped without oil. It is crucial to add the correct type and amount of oil before starting. The engine features a low oil shutdown system that will prevent it from starting or stop it if the oil level is insufficient.
- Place the engine on a level surface.
- Locate the oil fill cap/dipstick.
- Unscrew and remove the dipstick, wipe it clean, and reinsert it without screwing it in.
- Remove the dipstick again and check the oil level. It should be at the 'H' (High) mark.
- Add approximately 600ml of 4-stroke gasoline engine oil. Recommended viscosity: 10W30 (for ambient temperatures -25°C to 30°C in winter) or 15W40 (for ambient temperatures -15°C to 40°C in summer).
- Do not overfill. Reinstall the dipstick securely.

Figure 2: Location of the sealed oil port (bottom left inset).
3.3 Adding Fuel
Use clean, fresh unleaded gasoline with an octane rating of 92# or 95#.
- Ensure the engine is off and cool.
- Open the fuel tank cap.
- Carefully pour gasoline into the fuel tank, avoiding overfilling.
- When replacing the fuel tank cap, align the two ears on the cap with the concave parts on the tank, then press down and turn to secure it.

Figure 3: Engine with 6.5L fuel tank (top left inset shows fuel filling).
3.4 Mounting the Engine
Securely mount the engine to your equipment (e.g., go-kart, log splitter) using appropriate hardware. Ensure the mounting surface is stable and can support the engine's weight and vibrations during operation.
4. Operating Instructions
4.1 Starting the Engine (Recoil Start)
Follow these steps to start your FOGGBET 15HP engine:
- Turn the speed lever to the left side. For new machines, keep it in this position and do not move it initially.
- Turn the check valve to the left side.
- Turn the fuel control valve on the right side.
- Turn the engine switch to the 'ON' position.
- Grasp the recoil starter handle firmly and pull it quickly and smoothly until the engine starts. Do not let the rope snap back.
- Once the engine starts, turn the check valve to the right side.

Figure 4: Visual guide for starting the engine.
4.2 Stopping the Engine
To stop the engine, simply turn the engine switch to the 'OFF' position.
4.3 Operation Tips
- The engine's efficient cooling system, featuring forced air cooling and a ventilated heat sink, helps maintain optimal operating temperatures for reliability and durability.
- A high-precision carburetor contributes to low fuel consumption (≤374 g/kw.h), reducing operating costs.
- The large 1.72-gallon (6.5L) fuel tank allows for extended operation without frequent refueling.
- The integrated silencer helps reduce noise levels during operation, providing a quieter working environment.
5. Maintenance
Regular maintenance is essential for prolonging the life and ensuring the optimal performance of your engine.
5.1 Air Filter Maintenance
The air filter helps prevent dirt and debris from entering the engine, reducing wear and extending its life. Regularly inspect and clean or replace the air filter as needed, especially when operating in dusty conditions.

Figure 5: Location of the air filter (top left inset).
5.2 Oil Change
Change the engine oil after the first 20 hours of operation, and then every 50-100 hours or annually, whichever comes first. Refer to the oil type recommendations in Section 3.2.
5.3 Spark Plug Inspection
Inspect the spark plug periodically. Clean or replace it if it is fouled or damaged. Ensure the correct spark plug gap is maintained according to specifications.
5.4 General Cleaning
Keep the engine clean and free of debris. Regularly remove any dirt or grass buildup from the cooling fins to ensure efficient heat dissipation.
6. Troubleshooting
This section provides solutions for common issues you might encounter.
| Problem | Possible Cause | Solution |
|---|---|---|
| Engine does not start | No fuel Low oil level Engine switch OFF Choke not set correctly | Add fresh fuel Add engine oil to correct level Turn engine switch to ON Adjust choke lever |
| Engine lacks power | Dirty air filter Stale fuel Incorrect spark plug gap | Clean or replace air filter Drain and refill with fresh fuel Inspect and adjust/replace spark plug |
| Excessive smoke | Overfilled oil Incorrect oil type | Drain excess oil Use recommended oil type |
If you encounter problems not listed here or if solutions do not resolve the issue, please contact FOGGBET customer support.
7. Specifications
| Feature | Detail |
|---|---|
| Model | 15HP |
| Engine Type | 4-Stroke, Air-Cooled, OHV Gasoline Engine |
| Displacement | 420CC |
| Max Power Output | 9700 W (15 HP) |
| Rated Power Output | 8800 W |
| Rated Speed | 3000-3600 rpm |
| Fuel Tank Capacity | 1.72 Gallons (6.5 Liters) |
| Fuel Consumption | ≤374 g/kw.h |
| Recommended Oil | 10W30 (winter) / 15W40 (summer) 4-stroke engine oil |
| Cooling System | Forced Air Cooling with Ventilated Heat Sink |
| Starting System | Recoil Start (Pull Start) |
| Weight | Approximately 62 lbs |
| Dimensions (Approx.) | Height: 44cm (17.32in) Length: 40.5cm (15.94in) Width: 32cm (12.6in) |
| Application Scope | Go-karts, compressors, lawn mowers, water pumps, generators, pressure washers, truck mowers, cement mixers, dust collectors, etc. |

Figure 6: Engine dimensions.
8. Warranty and Support
For warranty information or technical support, please refer to the documentation included with your purchase or contact FOGGBET customer service directly. Keep your purchase receipt as proof of purchase.