1. Important Warning
This manual includes important safety performance information and service information. Please ensure you have read the following warning content before using the product for the first time.
If you lend your electric bicycle to others, please let the user read this manual to help reduce the risk of accidents.
Wear a suitable and safe helmet before riding. Wear clothes with fluorescent and reflective stripes when riding at night. Do not exceed the speed limit, as it is a primary cause of traffic accidents. Adhere to traffic rules and do not exceed the speed limit.
Do not touch the charging hole on the bike with metal objects, as this can cause a transient short circuit of the current.
Zero starting, frequent braking, riding against the wind, carrying excessive loads, or insufficient tire pressure will consume significant electric energy and reduce the endurance mileage. For optimal endurance mileage, follow these guidelines:
- Please use assist mode.
- Prioritize safety: avoid frequent braking or zero starting.
- Do not overload the e-bike.
- Before riding, check tire pressure and ensure it is adequately inflated.
The ENGWE e-bike should avoid prolonged exposure to sun or rain, and storage in places with high temperatures or corrosive gases, to prevent damage to electroplated parts and paint surfaces from chemical corrosion, and to avoid damage to electrical components, which could lead to operational failure and accidents.
Your current insurance may not cover situations encountered while riding an electric bike. Please contact your insurance company or broker for relevant consultation.
If using the e-bike in your country, please refer to local laws and regulations. For example, in China, riders must be at least 16 years old.
Bicycles are vehicles with inherent risk factors. Please abide by traffic rules. When performing emergency braking, brake the rear wheel first, then the front wheel, especially at high cycling speeds. Braking the front wheel suddenly can cause tipping over; please ride carefully.
2. Product Components
The electric bike includes the following components:
- 1. Display
- 2. Handlebar
- 3. Brake lever
- 4. Grip
- 5. Folding stem
- 6. Front light
- 7. Front mudguard
- 8. Front wheel
- 9. Pedal
- 10. Rear wheel
- 11. Rear mudguard
- 12. Rear light
- 13. Rear saddle
- 14. Battery
- 15. Seat post
- 16. Saddle
3. Technical Parameters
| Performance index | Project | US | EU |
|---|---|---|---|
| Basic Parameters | Vehicle Size | 1320*530*1060mm | 1320*530*1060mm |
| wheel Size | 14Inches | 14Inches | |
| Body Material | Aluminium alloy | Aluminium alloy | |
| Maximum Load | 220.4 lbs (100KG) | 220.4 lbs(100KG) | |
| Vehicle weight | 59.3 lbs (26.9KG) | 59.3 lbs (26.9KG) | |
| Main Parameters of the Whole Vehicle | Maximum Speed | 20mph(32km/h) | 25km/h |
| Maximum Gradient | 10° | 10° | |
| Battery Parameters | Rear Derailleur | - | - |
| Mileage Range | 55km (34miles) | 71km (44miles) | |
| Motor Parameters | Working Temperature | 23°F-95°F(-5~35) | 23°F-95°F(-5~35) |
| Charger Parameters | Rated Voltage | 48V | 48V |
| Battery Capacity | 15.6AH | 15.6AH | |
| Motor Parameters | Motor Power | 400W | 250W |
| Motor Type | Brushless Gear Motor | Brushless Gear Motor | |
| Charger Parameters | Input voltage | 100-240v | 100-240v |
| output voltage | 54V | 54V | |
| Output Current | 2A | 2A |
4. Product Installation
Tool Checklist
The following tools are included for installation:
- Phillips Screwdriver
- 8-10mm Wrench
- 13-15mm Wrench
- 14-17mm Wrench
- 4mm Hex Key
- 5mm Hex Key
- 6mm Hex Key
- Charger
- Bicycle-Pedals
4.1 Install the handlebar
Insert the handlebar stem into the fork and secure it. Then, attach the handlebar assembly to the stem, ensuring it is properly aligned and tightened.
4.2 Install the battery
Slide the battery into its designated compartment on the frame until it is securely seated.
4.3 Install the seat post
Insert the seat post into the frame. Adjust the height as needed and secure it using the saddle flip handle.
4.4 Install the pedals
- Identify the left (L) and right (R) pedals. The 'R' pedal is installed on the side of the chainring, and the 'L' pedal is installed on the opposite side.
- Tighten the right pedal ('R') clockwise. Tighten the left pedal ('L') counterclockwise, using the provided 15mm wrench.
4.5 Install the phone holder
Connect the cable for the phone holder to the appropriate port on the handlebar assembly.
5. Display Instructions
1. Product Name and Model
Intelligent LCD display for e-bike; model: YL81C.
2. Specifications
- 36V/48V power supply
- Rated working current: 15mA
- Maximum working current: 30mA
- Leakage current at power-off: <1uA
- Working current at the supply controller end: 50mA
- Working temperature: -20°C to 60°C
- Storage temperature: -30°C to 70°C
3. Appearance and Dimension
The display shows various information including speed and battery level.
4. Function Overview and Functional Area Layout
4.1 Function Overview
Display YL81C offers various functions to meet riding needs:
- Battery level indicator
- Assist level adjustment and indication
- Headlight indicator
- Speed indicator (real-time speed, maximum speed (MAXS), and average speed (AVG))
- Distance indicator (ODO and trip distance (Trip))
- Error code indicator
- Bluetooth connection indicator (reserved)
- Parameter setting function
4.2 Functional Area Layout
The display features indicators for battery level, speed, assist level, maximum speed, trip distance (ODO/TRIP), and status icons for Bluetooth and headlights. It also shows speed units (km/h or MPH) and average speed.
5. General Operation
5.1 Power On/Off
Press and hold the [power button] to turn on the display and the e-bike's controller. Press and hold the [power button] again to power off the e-bike. In the power-off state, the display consumes less than 1uA. The e-bike will automatically power off after 10 minutes of inactivity.
5.2 Display Interface
Upon powering on, the display shows real-time speed (km/h) and trip distance (km) by default. Pressing the [power button] cycles through trip distance (km), ODO (km), maximum speed (km/h), and average speed (km/h). The distance display resets to zero after reaching 9999.9 km.
5.3 Push Assistance
Press and hold the [minus button] to enable electric push assistance mode. The e-bike will maintain a constant speed of 6km/h, indicated by 'P' on the display. Releasing the [minus button] stops power output and returns to the previous state. This function is intended for pushing the e-bike, not for riding.
5.4 Headlight On/Off
Press and hold the [power button] to turn on the headlights and dim the display backlight. Press and hold the [power button] again to turn off the headlights and restore display brightness.
5.5 Assist Level Selection
Press the [plus button] or [minus button] to switch between assist levels 1, 2, and 3, which adjust motor output power.
5.6 Battery Level Indicator
The battery level is shown by five segments. All segments are illuminated when fully charged. In case of low voltage, the indicator outline flashes, signaling the need for immediate charging.
5.7 Error Code Indicator
When a fault occurs in the electronic control system, the display will show an error code in the format E0**. Refer to Schedule 1 for detailed definitions. If an error code appears, conduct troubleshooting promptly to ensure normal operation.
6. General Setting
All parameters can only be set when the e-bike is stopped. In the power-on state, when the display shows 0 speed:
6.1 Trip Distance Reset
Press and hold the [power button] and [minus button] simultaneously for more than 2 seconds to reset the trip distance.
6.2 Factory Reset
'dEF' refers to factory reset. 'dEF-n' means not restoring factory settings, and 'dEF-y' means restoring factory settings. Press and hold the [power button] and [plus button] simultaneously for more than 2 seconds to enter the factory reset interface. Use the [plus button] / [minus button] to select a parameter.
6.3 Speed Limit Setting
P3 is the speed limit setting option, with an adjustable range of 10-40km/h. Press the [power button] to enter parameter modification, use the [plus button] / [minus button] for selection, and press the [power button] to save and return to the general setting options.
6.4 Metric/Imperial System Setting
P4 is the metric/imperial system setting option. '00' represents the metric system, and '01' represents the imperial system. Press the [power button] to enter parameter modification, use the [plus button] / [minus button] for parameter selection, and press the [power button] to save and return to the general setting options.
Schedule 1: Error Code Definitions
Error codes for protocols YL-01 and YL-02:
| Error codes for protocols YL-01 and YL-02 | Definition | Error codes for protocols YL-01 and YL-02 | Definition |
|---|---|---|---|
| E001 | Controller Abnormality | E004 | Throttle Abnormality |
| E002 | Communication | E005 | Brake Abnormality |
| E003 | Motor Hall Signal | E006 | Motor Phase |
Error codes for protocols YL-05, KDS and YL-J:
| Error codes for protocols YL-01 and YL-02 | Definition | Error codes for protocols YL-01 and YL-02 | Definition |
|---|---|---|---|
| E021 | Current Abnormality | E024 | Motor Hall Signal |
| E022 | Throttle Abnormality | E025 | Brake Abnormality |
| E023 | Motor Phase | E030 | Communication |
6. Battery
The range of a fully charged battery depends on factors like rider weight, road conditions, and battery capacity. Under similar conditions, maintaining average speeds allows for longer travel distances.
When storing the battery for extended periods (e.g., during winter), it is important to keep it in a dry place.
Attention: The battery should be recharged every 2-3 months if not in use.
WARNING:
- Keep the battery out of reach of children.
- Never attempt to open the battery.
- Only use the ENGWE supplied battery. Do not use batteries from other product models.
- If the battery is damaged due to dropping or an accident, there is a risk of electrolyte leakage. Beware of chemical burns and stop using the damaged battery immediately.
- Do not touch the battery without gloves or a cloth, and ensure no acid contacts your eyes.
- Do not store the battery in temperatures above 95°F (35°C) or below 23°F (-5°C).
Do not allow the battery to fully discharge before charging. Charge the battery before storing the product. A completely empty battery may become unchargeable.
Charge a new battery for at least 4-6 hours before its first use. Avoid overcharging or undercharging, as this can shorten battery life and reduce product run time.
IMPORTANT: BATTERY DISPOSAL
- Battery must be recycled or disposed of in an environmentally sound manner.
- Do not dispose of the battery in a fire, as it may explode or leak.
- Do not dispose of the battery in regular household trash.
7. Charging
You can charge the bike directly or remove the battery for charging. A RED light indicates charging, and a GREEN light indicates the battery is fully charged. (Please unplug from the wall after charging). Charging time is typically 4-6 hours, depending on the remaining battery capacity.
WARNING:
- Charging for over 10 hours is prohibited. Keep the charger away from high temperatures and store it in a cool place.
- Ensure the battery charger and charging plug are always kept dry and never get wet.
- Clean the charger only with a dry cloth. Never use a wet cloth, oil, or any other liquid.
- Do not connect positive and negative terminals.
- Stop the charging procedure immediately if you notice anything unusual.
- It is strictly forbidden to cut the battery charging and discharging lines.
- It is strictly forbidden to disassemble the battery box or modify the internal structure and protection board of the lithium battery.
- After using the battery, please charge it within 12 hours.
If the product experiences issues during the protection period, customer service will be provided as part of the product quality guarantee.
8. Warranty Policy
Dear customer!
Thank you for purchasing ENGWE series products!
Warranty Service:
Please visit the official website https://engwe-bikes.com/ to view the ENGWE warranty policy.
After purchasing ENGWE products, please contact ENGWE after-sales service for assistance with any quality issues. This means contacting the customer service of the seller from whom you purchased your e-bike.
Please provide your order number, purchase interface, and videos of the issue.
