DYU C4 Mini Electric Bike User Manual

1. Important Safety Information

Before operating your DYU C4 Mini Electric Bike, please read and understand all safety instructions. Failure to follow these instructions may result in serious injury or damage to the product.

1.1 Helmet Use

Always wear a properly fitted helmet that complies with CPSC or CE safety standards when riding your electric bike. Ensure the helmet covers your forehead for maximum protection.

Image 1.1: Correct and Incorrect Helmet Fitting. Ensure your helmet covers your forehead.

1.2 General Safety Guidelines

• Always wear appropriate safety gear, including a helmet, gloves, kneecap, and elbow protectors.
• Ride at a medium speed and be aware of your surroundings.
• Do not ride on motorways, pedestrian-only areas, or excessively steep slopes (climbing gradient should be less than 15 degrees).
• Do not exceed the maximum load capacity of 120 kg (264.55 lbs).
• Avoid riding in extremely hot, cold, or wet conditions, especially on bumpy roads.
• This product is not intended for use by children under 16 years of age.
• Be cautious when braking, speeding, or turning. Maintain a safe distance from others.
• Pay extra attention on slippery or smooth roads and ensure sufficient braking distance.
• Avoid driving too close to motor vehicles or in their blind spots.

2. Product Overview

Familiarize yourself with the components of your DYU C4 Mini Electric Bike.

Image 2.1: DYU C4 Mini Electric Bike Parts Diagram.

1. Bell
2. Turn the handle
3. Power On/Off Button
4. Handlebar
5. Riser
6. Quick release (for handlebar stem)
7. Riser (handlebar stem)
8. Head tube
9. Front fork
10. Front wheel
11. Wheel hub
12. Wheel disc brake
13. Front disc
14. Front fender
15. Frame
16. Battery box
17. Kickstand
18. Motor
19. Rear fender
20. Deck
21. Seat tube quick release
22. Seat tube
23. Seat
24. Basket

3. Specifications

Note: Maximum speed and range are influenced by factors such as rider weight, terrain, tire pressure, riding style, and temperature.

4. Setup and Assembly

Your DYU C4 Mini Electric Bike requires some assembly before its first use. Please follow these steps carefully.

4.1 Unboxing and Initial Inspection

1. Carefully remove all components from the packaging.
2. Check for any visible damage during transit. If you find any damage, contact customer support immediately.
3. Ensure all parts listed in the product overview (Section 2) are present.

4.2 Handlebar Installation

The handlebar needs to be connected and secured to the main stem.

Image 4.1: Handlebar Wiring and Installation Steps.

1. Locate the 5-PIN connector wires extending from the handlebar and the main stem.
2. Carefully connect the two ends of the 5-PIN connector, ensuring they are fully seated.
3. Insert the handlebar stem into the head tube.
4. Align the handlebar and tighten the 6 screws into place using the Allen key provided in the box. Ensure the handlebar is secure and does not wobble.

4.3 Pre-Ride Checks

Before your first ride, perform the following checks:

• Tire Pressure: Ensure tires are adequately inflated. Refer to the tire sidewall for recommended pressure.
• Brake System: Test both front and rear brakes to ensure they engage properly and provide sufficient stopping power.
• Circuit System: Turn on the bike and check if the digital display lights up and functions normally.
• Fasteners: Verify that all screws and quick releases (handlebar, seat) are securely tightened.
• Battery Charge: Ensure the battery is fully charged before your first ride.

5. Operating Instructions

Understand the functions and controls of your DYU C4 Mini Electric Bike for a safe and enjoyable ride.

5.1 Display Functions

Image 5.1: Digital Display and Handlebar Controls.

• Power Button: Press and hold for 3 seconds to turn the e-bike on or off.
• Mode Indicator: Displays the current speed level. Press the setting button once to cycle through speed modes:
  • 1. 15 km/h (Relaxed Cruising)
  • 2. 20 km/h (Daily Riding)
  • 3. 25 km/h (Faster Commute)
  • 4. 32 km/h (Full Speed Mode)
• Speed Indicator: Displays current speed in km/h or mph.
• Display KM/H or MPH: Press the power button 3 times to switch between km/h and mph.
• Start Mode Indicator: Press the power button 2 times to switch between Soft Start (E) and Hard Start (S).
  • Soft Start (E): Speed increases gradually when throttle is turned.
  • Hard Start (S): Speed increases rapidly when throttle is turned.
• Battery Indicator: Displays the current battery level.
• Headlight Indicator: Press and hold the setting button for 3 seconds to turn the headlight on or off.

5.2 Riding Your Electric Bike

• Starting: Turn on the power, select your desired speed mode, and gently twist the throttle to accelerate.
• Braking: Apply both front and rear disc brakes simultaneously for effective stopping. Brake the rear wheel slightly before the front wheel. Avoid sudden, harsh braking, especially at high speeds.
• Parking: When dismounting, turn off the power to conserve battery and prevent accidental acceleration. Use the kickstand to park on a stable, flat surface. Do not park in building halls, evacuation staircases, or safety exits.
• Folding Design: The DYU C4 Mini features a portable folding design. To fold, pull the release lever, pull down the stem, and fold the stem fully. This makes it easy to store in car trunks or small spaces.
• Adjustable Seat: The seat height can be adjusted from 28.0" to 33.9" for rider comfort.

6. Maintenance

Proper maintenance ensures the longevity and safe operation of your DYU C4 Mini Electric Bike.

6.1 Battery Care Instructions

• Use: Only use the original lithium-ion battery. Handle with care; do not drop, modify, or use damaged batteries.
• Charging: Charge your e-bike at room temperature (between 0°C and 45°C) on a hard, non-flammable surface. Avoid overcharging; unplug once fully charged (5-6 hours). Do not charge in residential buildings or where children can reach.
• Storage: Store the battery at approximately 50% charge in a dry, room-temperature environment (5-20°C). Check and recharge every 3 months if not in use. Avoid extreme temperatures, direct sunlight, and moisture.
• Safety: Do not immerse the battery in water or expose it to fire. Do not attempt to disassemble the battery.

6.2 Charger Care

• Use only the designated special charger.
• Ensure the charger plug is clean and dry.
• Avoid using the charger in unstable, humid, dusty, or direct sunlight environments.
• Protect the charger from impacts and prevent liquids or metal objects from entering it.
• Do not open or modify the charger.

6.3 Motor and Controller Care

• Protect the motor outlet from short circuits and avoid motor immersion in water.
• Protect exposed wires of the vehicle to prevent short circuits in the controller. Do not flush the controller with water.

6.4 General Maintenance

• Regularly check tire pressure and inspect tires for wear or damage.
• Keep the bike clean. Use a damp cloth to wipe down surfaces; avoid high-pressure washing.
• Periodically check all bolts and fasteners for tightness.

7. Troubleshooting

This section addresses common issues and safety alerts you might encounter.

7.1 Safety Alerts

The e-bike's system may prompt alerts for various conditions:

• Prohibited Riding Surfaces: Uneven, too steep, or unsafe terrain.
• Low Battery Voltage: The battery icon will flash when power is low. The motor will power off after 15 seconds if the battery level depletes below protection mode.
• Overheating: If the motor temperature is too high, the device may stop.
• Tires Blocked: If one or both tires are blocked, the device will stop after 10 seconds.
• High Discharge Current: If riding up a steep slope for a long period, the motor may power off after 15 seconds to prevent damage.

7.2 Common Issues

• Bike does not turn on: Check if the battery is charged and properly connected. Ensure the power button is pressed and held for 3 seconds.
• Motor not engaging/slow acceleration: Ensure the throttle is fully engaged. Check battery level. If the initial speed is slow, it may pick up after a moment.
• Short battery life/range: Ensure the battery is fully charged. Riding style (high speed, frequent stops), terrain (uphill), rider weight, and temperature can affect range. Refer to battery care instructions.
• Brakes feel weak: Check brake pads for wear. Ensure brake cables are properly tensioned.

For issues not listed here or if troubleshooting steps do not resolve the problem, please contact customer support.

8. User Tips

Here are some practical tips from other users to enhance your experience with the DYU C4 Mini Electric Bike:

• Initial Acceleration: Some users note that the initial speed can be a bit slow, but the bike picks up speed smoothly after starting. Give it a moment to accelerate to your desired pace.
• Battery Management: To maximize battery life and range, always fully charge the battery before use. Avoid letting the battery drain completely. If you notice shorter than expected range, review the battery care instructions in Section 6.1.
• Assembly: The DYU C4 Mini requires some self-assembly. Follow the provided video and instructions carefully. If you need assistance, consider seeking help from someone experienced with bike assembly.
• Rider Size: This model is compact. While adjustable, it's designed for a recommended height range of 4.8" - 5.7". Consider this for optimal comfort and control.
• Charging: Always ensure the battery and charger are included in your package. Charge the battery as soon as you receive the bike, as it may not be fully charged from the factory.

9. Warranty and Support

Your DYU C4 Mini Electric Bike comes with a limited warranty. Please review the terms and contact support if you have any issues.

9.1 Warranty Information

Image 9.1: DYU C4 Mini Warranty Information Table.

The manufacturer's warranty does not cover any physical/accidental damage due to improper usage, normal wear and tear, or water/liquid damage.

For the latest warranty information, please visit: https://dyucycle.com/pages/warranty

9.2 Customer Support

If you experience any issues relating to assembly, riding, maintenance, or safety, please contact DYU customer support:

• Official Website: Service@dyucycle.com
• Amazon Support: supporteu@dyucycle.com