1. Introduction
Thank you for purchasing the X-PRO Leopard 40 Mini Dirt Bike. This manual provides essential information for the safe assembly, operation, maintenance, and troubleshooting of your new dirt bike. Please read this manual thoroughly before use and retain it for future reference. Proper understanding and adherence to these instructions will ensure optimal performance and longevity of your product.
2. Safety Information
Always prioritize safety when operating the X-PRO Leopard 40 Mini Dirt Bike. This vehicle is designed for off-road use by young riders under adult supervision. Ensure all safety gear, including helmets, gloves, and protective clothing, is worn during operation. Never operate the bike under the influence of alcohol or drugs. Regularly inspect the bike for any damage or loose parts before each ride.
- Adult Supervision: Always operate under direct adult supervision.
- Protective Gear: Wear appropriate safety gear, including a helmet, eye protection, gloves, and sturdy footwear.
- Pre-Ride Inspection: Check brakes, tires, fuel level, and all fasteners before each use.
- Operating Environment: Use only in designated off-road areas, away from public roads and traffic.
- Speed Limiter: Utilize the adjustable speed limiter to match the rider's skill level.
3. Setup and Assembly
The X-PRO Leopard 40 Mini Dirt Bike requires some assembly upon arrival. Please follow these steps carefully.
3.1 Unboxing and Inspection
Carefully remove all components from the packaging. Inspect for any shipping damage or missing parts. Refer to the packing list to ensure all items are present.

Figure 1: X-PRO Leopard 40 Mini Dirt Bike packaging box.
3.2 Assembly Steps
Assembly typically includes attaching the handlebar brackets, wheels, brakes, number plate, and fenders. Specific instructions may vary slightly by model, so consult any included supplementary guides.
- Handlebar Installation: Securely attach the handlebars to the fork using the provided brackets and bolts. Ensure all bolts are tightened to the manufacturer's specifications.
- Wheel Attachment: Install the front and rear wheels. Ensure the brake discs are correctly aligned with the calipers and that all axle nuts are securely fastened. Verify that the flange nut holding the wheel into the front fork is present and tightened.
- Brake Adjustment: Adjust the front and rear mechanical disc brakes to ensure proper function and clearance. There should be a slight gap between the brake pads and the disc when the lever is not engaged.
- Fender and Number Plate: Attach the front and rear fenders and the number plate as per the design.
- Fueling: The X-PRO Leopard 40 features a 4-stroke engine. This means you do not need to mix oil with the gasoline. Use fresh, unleaded gasoline with the recommended octane rating (refer to engine specifications). The fuel capacity is approximately 0.449 gallons.

Figure 2: Assembled X-PRO Leopard 40 Mini Dirt Bike (side view).
4. Operating Instructions
4.1 Starting the Engine
The X-PRO Leopard 40 uses a manual-hand pull start system.
- Ensure the fuel valve is open and the engine kill switch is in the 'RUN' position.
- If the engine is cold, engage the choke.
- Grasp the pull-start handle firmly and pull it smoothly and quickly until the engine starts. Do not pull the cord to its full extension.
- Once the engine starts, gradually disengage the choke as the engine warms up.
- Allow the engine to warm up for a few minutes before riding.
4.2 Riding the Dirt Bike
The bike is equipped with a chain drive system. Control speed using the throttle on the right handlebar and stop using the front and rear mechanical disc brakes.
- Throttle Control: Gently twist the throttle to accelerate. Release the throttle to decelerate.
- Braking: Apply both front and rear brakes smoothly and evenly to stop. Avoid sudden, hard braking, especially with the front brake, to prevent loss of control.
- Speed Limiter: The bike includes a speed limiter for added safety. Parents can adjust this feature to prevent excessive speeds, with a maximum potential speed of 28+ Mph (depending on rider weight and road conditions).
- Engine Kill Switch: In case of an emergency, press the engine kill switch to immediately shut off the engine.

Figure 3: X-PRO Leopard 40 Mini Dirt Bike (rear-side view).
5. Maintenance
Regular maintenance is crucial for the safe and reliable operation of your dirt bike.
5.1 Routine Checks
- Tires: Check tire pressure before each ride. Ensure tires are free from cuts or excessive wear.
- Brakes: Inspect brake levers, cables, and pads for wear. Ensure brakes engage smoothly and effectively.
- Chain: Keep the drive chain clean, lubricated, and properly tensioned.
- Fasteners: Periodically check all nuts, bolts, and fasteners for tightness.
- Fuel System: Inspect fuel lines and connections for leaks. Ensure the fuel tank cap is secure.
5.2 Engine Maintenance
- Oil Changes: As a 4-stroke engine, regular oil changes are necessary. Refer to the engine manual for recommended oil type and change intervals.
- Air Filter: Clean or replace the air filter regularly, especially when riding in dusty conditions.
- Spark Plug: Inspect and clean or replace the spark plug as needed to ensure reliable starting and engine performance.
6. Troubleshooting
This section addresses common issues you might encounter with your X-PRO Leopard 40 Mini Dirt Bike.
| Problem | Possible Cause | Solution |
|---|---|---|
| Engine does not start |
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| Engine runs poorly or stalls |
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| Gasoline leak |
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| Brakes not effective |
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| Missing or loose parts after assembly |
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7. Specifications
Detailed technical specifications for the X-PRO Leopard 40 Mini Dirt Bike (Model DB-B07).
| Feature | Detail |
|---|---|
| Model Number | DB-B07 |
| Engine Type | SZ140QMA, 38.95cc, 4-stroke, air cooling, single cylinder |
| Start Type | Manual-hand Pull Type |
| Compression Ratio | 9.6:1 |
| Bore x Stroke | Φ40 × 31mm |
| Max Torque | 1.75Nm at 5500rpm |
| Max Power | 1.1kw at 7000rpm |
| Drive Train | Chain Drive |
| Ignition Type | C.D.I |
| Top Speed | 28+ Mph (Depending on Riders Weight and Road Conditions) |
| Front Brake | Mechanical Disc |
| Rear Brake | Mechanical Disc |
| Front Tire | 2.50-10" |
| Rear Tire | 2.50-10" |
| Net Weight | 48.4 lbs |
| Gross Weight | 59.4 lbs |
| Weight Capacity | 132 lbs (60 kg) |
| Overall Length | 48.4" |
| Overall Width | 23.6" |
| Overall Height | 30.7" |
| Wheelbase | 32.28" |
| Ground Clearance | 8.66" |
| Fuel Capacity | 0.449 gal |
| Seat Height | 23.6" |
| Engine Kill Switch | Yes |
| Speed Limiter | Yes |
| Frame Material | Alloy Steel |
| Color | Red |
| Assembly Required | Yes |
8. Warranty and Support
For information regarding product warranty, returns, or technical support, please refer to the documentation provided at the time of purchase or contact your seller directly. Warranty terms and conditions may vary.



