ENGWE L20 Electric Bike User Manual

1. Important Warning ⚠️

This manual contains important safety performance information and service information. Please ensure you have read the following warning content before using your product for the first time.

If you lend your electric bicycle to others, please let the user read this manual to help decrease the risk of accidents.

Please 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 this is a main reason for traffic accidents. Always abide by traffic rules and do not exceed the speed limit.

Do not touch the charging hole on the bike, or use metal to touch it, as this could cause an accident due to a transient short circuit of the current.

Starting from zero, frequent braking, driving against the wind, carrying passengers or heavy items, and insufficient tire pressure all consume significant electric energy and reduce the endurance mileage. For optimal endurance mileage, please follow these guidelines:

• 1) Use assist mode.
• 2) Prioritize safety: do not brake frequently or use zero starting.
• 3) Do not overload.
• 4) Before riding, check tire pressure and ensure it is sufficient.

Your e-bike should avoid prolonged exposure to the sun or rain. Avoid storage in places with high temperatures or corrosive gases to prevent damage to electroplating parts and paint surfaces from chemical corrosion and electrical component damage, 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.

When using your 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 be sure to abide by traffic rules. In case of emergency braking, brake the rear wheel first, then the front wheel. If cycling speed is too fast, there is a danger of tipping over if you brake the front wheel suddenly. Please ride carefully.

2. Product Components

The following diagram illustrates the main components of your ENGWE L20 electric bicycle:

[Diagram: Side view of an electric bicycle with numbered parts.]

• 1. Display
• 2. Handlebar
• 3. Front basket
• 4. Front light
• 5. Fork
• 6. Tire
• 7. Pedal
• 8. Crank set
• 9. Battery
• 10. Chain
• 11. Freewheel
• 12. Motor
• 13. Rear light
• 14. Seatpost
• 15. Saddle

3. Technical Parameters

Specifications for the ENGWE L20 e-bike:

4. Product Installation

Tool Box Checklist

Ensure you have the following tools and components before beginning installation:

• Phillips Screwdriver
• 8-10mm Wrench
• 13-15mm Wrench
• 14-17mm Wrench
• 4mm Hex Key
• 5mm Hex Key
• 6mm Hex Key
• Charger
• Bicycle-Pedals

[Diagram: Illustrations of the tools listed above.]

4.1 Install the Handlebar

1. Remove the handlebars from the packaging material and place the center at the riser clamp.
2. Install the 4mm hexagon wrench clockwise. Do not fully tighten the 4 bolts initially (as shown in Figure A). Adjust the handlebar to the proper angle (as shown in Figure B), and then tighten the 4 bolts with appropriate force.

[Diagram: Figure A shows the handlebar stem area before tightening. Figure B shows the handlebar adjusted to a proper angle.]

4.2 Install the Front Wheel

1. Remove the front wheel from the packaging material. Install the screw gasket shaft sleeve according to the drawing.
2. Place the front wheel into the front fork card slot and secure it with a 15mm wrench.

[Diagram: Illustration of the front wheel with bolts and washers. Another diagram shows the front fork with the wheel being inserted, and a 15mm wrench.]

4.3 Install the Front Mudguard

1. Connect the lifting lug of the mudguard to the hole of the front fork axle pipe, and then thread in the screw to tighten it.
2. Align the mudguard support with the front fork mudguard take-up hole position, and then thread in the screw for tightening.

[Diagram: Illustration showing the mudguard attachment to the front fork, with a 5mm Hex Key indicated.]

4.4 Install the Front Basket

1. Remove the basket from the packaging material and install the screw gasket according to the drawing.
2. Install 4 bolts clockwise using a 4mm hexagon wrench, and secure the harness in the front shelf hook.

[Diagram: Illustration showing the front basket attachment points and a 4mm Hex Key. A detail shows the harness being secured.]

4.5 Install the Headlight

1. Install the headlight screw, washer, and nut according to the drawing.
2. Fix the headlight line as shown in the figure.

[Diagram: Illustrations showing the headlight mounting area and the headlight cable being secured with a zip tie.]

4.6 Install the Pedals

1. Prepare the left and right pedals. The pedal marked "R" is installed on the right side of the chainring, and the pedal marked "L" is installed on the opposite side.
2. Tighten the right pedal "R" clockwise. Tighten the left pedal "L" counterclockwise. Use a 15mm wrench.

[Diagram: Icons for Left (L) and Right (R) pedals. An illustration shows a pedal being attached to the crank arm, with a 15mm wrench.]

5. Display Instructions

5.1 Product Name and Model Name

Intelligent LCD display for e-bike; Model: YL81C.

5.2 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

5.3 Appearance and Dimension

[Diagram: Close-up image of the intelligent LCD display unit mounted on a handlebar, showing speed, battery level, and other indicators.]

5.4 Function Overview and Functional Area Layout

5.4.1 Function Overview

Display YL81C provides a variety of functions to meet riding needs, including:

• Battery level indicator
• Assist level adjustment and indication
• Headlight indicator
• Speed indicator (including real-time speed, maximum speed (MAXS), and average speed (AVG))
• Distance indicator (including ODO and trip distance (Trip))
• Error code indicator
• Bluetooth connection indicator (reserved)
• Parameter setting function

5.4.2 Functional Area Layout

[Diagram: Illustration of the display interface layout. Key areas include: Battery level indicator, Speed indicator, Bluetooth indicator, Headlight indicator, Assist level indicator, Maximum speed display, Trip distance indicator (TRIP, ODO), and the central display showing speed (km/h or MPH), PAS level, and AVG/TRIP/ODO values.]

5.5 Button Definitions

There are three buttons on the display unit YL81C:

• ? On/off button
• ➕ Plus button
• ➖ Minus button

5.6 General Operation

5.6.1 Power On/Off

By pressing and holding the ? button, the display will turn on, and the controller's power supply will be activated. In the power-on state, pressing and holding the ? button will power off your e-bike. In the power-off state, the display will not consume battery power, with leakage current less than 1uA. If your e-bike is not used for more than 10 minutes, the display will automatically power off.

5.6.2 Display Interface

After the display is turned on, it shows the real-time speed (km/h) and trip distance (km) by default. Pressing the ? button cycles through trip distance (km), ODO (km), maximum speed (km/h), and average speed (km/h). When the distance reaches 9999.9 km, it automatically resets to zero.

5.6.3 Push Assistance

By pressing and holding the ➖ button, the electric push assistance mode will be enabled. Your e-bike will run at a constant speed of 6 km/h. The display will show level "P". Releasing the ➖ button will immediately stop power output and return to the state before push assistance. This function can only be used when pushing your e-bike; do not use it while riding.

5.6.4 Headlight On/Off

By pressing and holding the ➕ button, the controller will turn on the headlights and dim the display backlight. Pressing and holding the ➕ button again will turn off the headlights, and the display backlight will return to its normal brightness.

5.6.5 Assist Level Selection

By pressing the ➕/➖ buttons, the e-bike's assist level will be switched to change motor output power. Available assist levels are 1-5.

5.6.6 Battery Level Indicator

The battery level indicator has five segments. When fully charged, all five segments are lit. In case of low voltage, the outline of the battery indicator will flash, indicating the battery needs 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 distance area in the format of E0**. Detailed definitions are in Schedule 1.

[Diagram: Display showing "E002".]

If an error code appears, please conduct troubleshooting promptly. Otherwise, your e-bike may not function correctly.

5.8 General Setting

All parameters can only be set when your e-bike is stopped. The steps for general setting are as follows: In the power-on state, when the display shows a speed of 0:

5.8.1 Trip Distance Reset

Press and hold the ? and ➖ buttons simultaneously for more than 2 seconds to reset the trip distance.

5.8.2 Factory Reset

"dEF" refers to factory reset. "dEF-n" means not to restore factory settings, and "dEF-y" means to restore factory settings. Press and hold the ? and ➕ buttons simultaneously for more than 2 seconds to enter the factory reset interface. Press the ➕/➖ buttons to select a parameter.

5.8.3 Speed Limit Setting

P3 represents the speed limit setting option. The adjustable range is 10-40 km/h. Press the ? button to enter parameter modification. Press the ➕/➖ buttons for parameter selection. Press the ? button to save the parameter and return to the general setting options interface.

[Diagram: Display showing "P3" with "25 Km/h".]

5.8.4 Metric/Imperial System Setting

P4 refers to the metric/imperial system setting option. "00" represents the metric system, and "01" represents the imperial system. Press the ? button to enter parameter modification. Press the ➕/➖ buttons for parameter selection. Press the ? button to save the parameter and return to the general setting options interface.

[Diagram: Display showing "P4" with "00 km/h" for metric. Display showing "P4" with "01 MPH" for imperial.]

Schedule 1: Error Code Definitions

Error codes for protocols YL-01 and YL-02:

Error codes for protocols YL-05, KDS and YL-J:

6. Battery

How far a fully charged battery can go depends on loading weight, road condition, and battery capacity. However, under the same conditions, average speeds can be maintained for a longer travel range.

When storing the battery for an extended period (e.g., during winter), it is important to place the fully charged battery in a dry place.

Attention: The battery should be recharged once every 2-3 months when 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 a battery from any other product models.
• If the battery is damaged due to dropping or an accident, there may be a risk of electrolyte leakage. Beware of chemical burns! Immediately stop using the damaged battery.
• Do not touch the battery without a cloth or gloves, and ensure no acid touches 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 run down completely before charging. Charge the battery before storing the product. If the battery is completely empty, it may become unable to charge.

Charge a new battery for at least 4-6 hours before using it in your product for the first time. Never charge the battery for excessively long periods. Overheating or undercharging the battery may shorten its life and decrease 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 a battery in your regular household trash.

7. Charging

You can charge the bike directly, or remove the battery for charging.

The RED light indicates charging, and the GREEN light indicates the battery is fully charged. (Please unplug from the wall when not charging). Usually, the charging time is 4-6 hours, depending on the remaining battery capacity.

WARNING:

• Charging for over 10 hours is prohibited. Keep it away from high-temperature environments and store it in a cool place.
• Please ensure the battery charger and charging plug are always kept dry and never get wet.
• The charger should only be cleaned 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 has problems during the protection period, ENGWE will provide customer service 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 warranty policy of Engwe.

After purchasing Engwe products, please contact Engwe after-sales service for assistance if there is a quality issue. This means you can contact the customer service of the seller from whom you purchased your e-bike.

Please provide your order number, proof of purchase, and videos of the issue.