1. Introduction
This manual provides essential information for the safe and efficient operation, maintenance, and troubleshooting of your SAMEBIKE YINYU14-II electric folding bicycle. Please read this manual thoroughly before your first ride and keep it for future reference.

Figure 1.1: The SAMEBIKE YINYU14-II Electric Folding Bicycle.
2. Product Features
2.1. Folding Design
The YINYU14-II features a convenient folding mechanism, allowing for easy storage and portability. This design makes it ideal for commuting, travel, or storing in compact spaces like car trunks or small apartments.

Figure 2.1: The bicycle's foldable design enhances portability.

Figure 2.2: The compact folded size allows for easy transport in vehicles.
2.2. Battery System
Equipped with a 36V 7.8Ah Lithium-Ion battery, the YINYU14-II offers a pure electric range of approximately 30KM and a pedal-assist range of over 60KM. A full charge typically takes 4-6 hours.

Figure 2.3: The 36V 7.8Ah Lithium-Ion battery provides extended range.
2.3. Braking System
The bicycle features upgraded front and rear Φ160mm dual disc brakes, providing reliable and strong stopping power for enhanced safety.

Figure 2.4: Mechanical disc brakes ensure effective stopping.

Figure 2.5: The 160mm diameter perforated brake discs provide great braking power.
2.4. Display and Controls
An intuitive LCD display provides real-time information such as speed, mileage (TRIP/ODO), and battery level. The handlebars include controls for the light switch, horn, and turn signals.

Figure 2.6: The LCD display and handlebar controls for easy operation.

Figure 2.7: The LED display clearly shows the battery level and other riding data.
2.5. Tires and Wheels
The bicycle is equipped with 14 x 2.15-inch tires, suitable for various road conditions, providing a stable and comfortable ride.

Figure 2.8: The 14-inch tires are designed for versatility across different terrains.
2.6. Safety Lighting System
For enhanced visibility and safety, the bike includes a front-mounted 250 lumen LED light and an eye-catching brake tail light.

Figure 2.9: The integrated safety lighting system for night riding.
3. Setup and Assembly
Your SAMEBIKE YINYU14-II comes over 90% pre-assembled. Follow these steps for final assembly:
- Carefully remove the bicycle and all components from the packaging.
- Unfold the bicycle frame and secure the folding mechanism latch.
- Install the handlebars and adjust their height to a comfortable position.
- Attach the pedals (note L/R markings).
- Adjust the seat post height for proper leg extension.
- Ensure all quick releases and bolts are securely tightened before riding.

Figure 3.1: The product packaging, indicating the model number YINYU14-II.
4. Operating Instructions
4.1. Charging the Battery
- Locate the charging port on the battery.
- Connect the charger to the port, then plug the charger into a standard wall outlet.
- The charger indicator light will show charging status (typically red for charging, green for full).
- Disconnect the charger once charging is complete.
4.2. Riding Modes
The SAMEBIKE YINYU14-II offers three riding modes:
- Riding Mode (Pedal Only): Ride the bicycle like a traditional bike without electric assistance.
- Pedal Power Assisted Mode (PAS): The motor provides assistance as you pedal. There are three adjustable levels of power assistance.
- Pure Electric Mode: Use the throttle to propel the bike without pedaling.
4.3. Starting and Stopping
- To Start: Turn the key switch to the 'ON' position. The LCD display will illuminate. For pure electric mode, gently twist the accelerator handle. For PAS mode, begin pedaling.
- To Stop: Apply the front and rear disc brakes smoothly and evenly. Release the throttle when braking.
4.4. Adjustments
- Handlebar Height: Loosen the quick release lever on the handlebar stem, adjust to desired height, and re-secure.
- Seat Height: Loosen the quick release lever on the seat post, adjust to desired height, and re-secure. Ensure your feet can comfortably touch the ground when stopped.
5. Maintenance
Regular maintenance ensures the longevity and safe operation of your electric bicycle.
5.1. Battery Care
- Charge the battery regularly, even if not in use, to maintain its health.
- Avoid fully discharging the battery.
- Store the battery in a cool, dry place away from direct sunlight and extreme temperatures.
5.2. Tire Care
- Check tire pressure before each ride. Maintain pressure within the recommended range (usually printed on the tire sidewall).
- Inspect tires for wear, cuts, or punctures regularly.
5.3. Brake Maintenance
- Regularly inspect brake pads for wear and replace them when necessary.
- Ensure brake levers are firm and responsive. Adjust cable tension if needed.
- Keep brake discs clean and free of oil or grease.
5.4. General Cleaning
- Clean the bicycle with a damp cloth and mild soap. Avoid using high-pressure washers directly on electrical components.
- Lubricate the chain regularly with bicycle chain lubricant.
6. Troubleshooting
Refer to the table below for common issues and their potential solutions.
| Problem | Possible Cause | Solution |
|---|---|---|
| Bike not turning on | Battery not charged; Key switch off; Loose battery connection | Charge battery; Turn key switch on; Check battery connection |
| Short riding range | Low tire pressure; Battery degradation; Excessive load; Frequent uphill riding | Inflate tires to correct pressure; Consult customer support for battery check; Reduce load; Use PAS mode more |
| Brakes not effective | Worn brake pads; Loose brake cable; Contaminated brake discs | Replace brake pads; Adjust brake cable tension; Clean brake discs with alcohol |
| Motor not assisting | PAS level too low; Sensor issue; Motor connection issue | Increase PAS level on display; Check all electrical connections; Contact customer support |
7. Specifications
Key technical specifications for the SAMEBIKE YINYU14-II electric folding bicycle:
| Feature | Specification |
|---|---|
| Model Number | YINYU14-II |
| Bike Type | Electric Folding Bike |
| Wheel Size | 14 Inches |
| Motor Power | 250W (High-speed brushless) |
| Max Speed | 25 KM/H |
| Battery | 36V 7.8Ah Lithium-Ion |
| Pure Electric Range | Approx. 30 KM |
| Pedal-Assist Range | Over 60 KM |
| Charging Time | 4-6 Hours |
| Brake Type | Front & Rear Disc Brakes (Φ160mm) |
| Frame Material | Carbon Steel |
| Max Load Capacity | 120 KG (265 lbs) |
| Bicycle Weight | Approx. 21 KG (46.2 lbs) |
| Recommended Rider Height | 1.3 - 1.8 M (4'3" - 5'11") |
| Display | LCD Digital Display |

Figure 7.1: Detailed product dimensions and recommended rider height.
8. Warranty and Support
SAMEBIKE is dedicated to providing comprehensive after-sales service. For any issues, warranty claims, or technical support, please contact SAMEBIKE customer service through the retailer or the official SAMEBIKE website. Please retain your proof of purchase for warranty validation.