Pexmor Electric Bicycle User Manual

Contents

• Safety Information
• Specifications and Parts List
• Product Diagram
• Assembly
• Maintenance
• LCD Instrument Use Instructions
• Bicycle Parts Warranty List
• FAQ and Suggest Solution

Safety Information

▲Warning!

• Install and adjust this bicycle ONLY in accordance with these instructions. Read them completely prior to installation and use. Contact customer service if any point is unclear.
• ALWAYS obey all applicable local and national laws and regulations while riding. Do not ride this bicycle in any area prohibited to electric bicycles. Always wear your helmet and other required protective gear. Always maintain your reflectors and other required safety equipment.
• Check whether the brakes function well using the brake levers before riding. Even after power is cut to the motorized wheel, the inertia of the bike will often require active braking power.
• ALWAYS ensure all fasteners and components are intact and securely tightened before and after every use.
• DO NOT ride this bicycle if any part is damaged or malfunctions. Repair or replace worn and broken parts before further use.
• Pay attention to the remaining power before setting out and during use. Recharge your battery as needed to ensure it never runs out of power at a moment where you are taken by surprise.
• DO NOT allow children or persons unfamiliar with these instructions to operate this bicycle without strict supervision.
• DO NOT wear loose footwear or clothing that may become caught in the wheels or any other moving parts.
• It is recommended that you not ride your bike fast when getting started. This can be ensured by setting the bike's maximum speed limit low until you are fully familiar with your new electric bike and its controls.
• ALWAYS be alert for people, animals, or any obstacles that may appear in front of you while riding your bicycle. Be aware that pedestrians and drivers may not expect the speed or responsiveness of your bike. Adjust your behavior accordingly. It is advisable to install warning devices to draw their attention, but always be ready to turn safely out of their way if needed. Do not focus on the LCD display for extended periods of time while riding.
• NEVER ride at a speed where your stopping distance exceeds your visibility. We do not recommend that you ride your bicycle at night or in an environment with poor visibility. If you have an emergency that makes it necessary to do so, keep your light on and limit your speed appropriately.
• DO NOT get the battery, its charger, or its power cord wet or operate them with wet hands.
• NEVER use the pedal assist system (PAS) or timed shutoff in any situation, road condition, or terrain where doing so might impair your control of your bicycle.
• NEVER adjust 03, 06, or 07 on the LCD display panel. Adjustment of these parameters should only be made when using the display with other compatible motorized wheels of differing voltage, diameter, or magnet arrangements. In any other case, any adjustment of these parameters should be undone immediately and the original settings restored before any further use of this bicycle.
• Disconnect the battery from this bicycle before any cleaning, servicing, and storage.

Specifications

Parts List

Product Diagram

Bicycle Components

A diagram illustrating the various parts of the electric bicycle, including:

• Motor
• Rear Sprocket
• Rear Wheel
• Derailleur
• Chain
• Front Sprocket
• Pedal
• Front Brake Caliper
• Front Brake Disc
• Crank Arm
• Front Wheel
• Spoke Reflector
• Front Fork
• Front Light
• Head Tube
• Down Tube
• Battery
• Seat Tube
• Seat Post
• Seat
• Rear Reflector
• Handlebars
• Stem
• Front Reflector
• Top Tube

Handlebars Components

A diagram illustrating the handlebar components, including:

• Front Gear Shifter
• Front Light Button
• Horn Button
• Brake Lever
• LCD Display Panel
• Rear Gear Shifter
• Throttle

Assembly

1. Installing the Handlebars

Steps for installing the handlebars:

1. Unscrew the top bolt and remove the cap from the stem of the handlebars (B).
2. Loosen the two side bolts on the left and right of the stem.
3. Slide the stem into the head tube of the main frame (A), ensuring the brake and derailleur cables are in the front of the bicycle.
4. Replace the cap, tightening the top bolt with the 5mm hex wrench (K).
5. Set the front fork facing forward, placing the brake caliper to the rear of the fork.
6. Retighten the two side bolts with the 4mm hex wrench (J) until the handlebars are locked in place.

2. Installing the Front Wheel

Steps for installing the front wheel:

1. Loosen each nut on the axle of the front wheel (C), adjust each washer to leave a space.
2. Rotate the handlebars, placing the front wheel's brake disc at the same side of the brake caliper to the rear of the front fork.
3. Turn the front fork 180° clockwise before attaching the front wheel to the front fork, sliding the brake disc into the slot of the brake caliper and placing the axle onto the slots of the fork's tips.
4. Rotate the captive washers and seat their tabs into the holes above the front wheel axle.
5. Tighten the nuts with the 15mm opening of the wrench (M).

3. Aligning the Handlebars

Steps for aligning the handlebars:

1. Secure the bicycle using a bike stand.
2. Loosen the two side bolts on the stem of the handlebars with the 4mm hex wrench.
3. While holding the front wheel firmly, rotate the handlebars to the desired position.
4. Retighten the bolts with your wrench.
5. Test that the handlebars are secure enough.

4. Installing Front Disc Brake

Steps for installing the front disc brake:

1. Pull the brake wire of the front brake tightly.
2. Use the L-shape 5mm inner hexagonal tool to fix the 3 screws on the brake.
3. Make sure that the disc is in the middle of the brake.
4. Test that the brake levers and brakes work smoothly and firmly before continuing.

5. Installing the Front Light

Steps for installing the front light:

1. Remove the nut and bolt from the top of the front fork.
2. Fit the connecting plate of the front light (F) onto the top of the fork, aligning their holes.
3. Replace the bolt and nut, tightening them with the 5mm hex wrench and the 10mm opening of the wrench (L) respectively.

6. Installing the Pedals

Note: The two pedals (D) ARE different and should NOT be mixed up. The right pedal is marked with an R and the left with an L.

1. Attach the pedals to the crank arms on the appropriate side, screwing them into place.
2. Tighten their locking nuts with your 15mm wrench.

7. Installing the Seat

Steps for installing the seat:

1. Loosen the clamp underneath the seat (E) by rotating its lever.
2. Insert the seat post into the tube until your preferred height is reached.
3. Retighten the clamp using its lever.
4. Check that the seat is secure. If needed, loosen the clamp, tighten its adjustment nut on the other side, and retighten the clamp.

8. Inflating the Tires

Steps for inflating the tires:

1. Remove the valve cap on a wheel.
2. Connect the valve to an appropriate pump.
3. Inflate the tire until it feels firm. For best results, stop inflation when the pressure reaches 50 psi (3.4 bars).
4. Disconnect your pump from the wheel, replacing the valve cap immediately.
5. Inflate the other tire following the same steps.

9. Installing the Battery

Steps for installing the battery:

1. Insert the attached key beside the battery (G) into the keyhole on the battery.
2. Turn the key counterclockwise to unlock the battery.
3. Fit the battery onto its mount on the down tube, pressing until it clicks into place.
4. Turn the key completely clockwise to lock the battery in place.
5. To activate or deactivate the LCD display panel and the motor, flip the battery's power switch to I (on) or O (off).

Assembly Video

A QR code links to an assembly video for the 27.5-inch e-bike.

Maintenance

Charging the Battery

You can see the remaining power on the battery's LED power display and the top left of the LCD display panel. When recharging is necessary:

1. Unlock the battery by inserting the key and turning counterclockwise.
2. Remove the battery from the bicycle.
3. Connect the charger (H) to a stable compatible power source.
4. Connect the battery to the charger using the provided power cord (I). The battery's power indicator light should turn red and charging should begin.
5. When the light turns green, the battery has been fully charged. Disconnect the charger first from your power source and then remove the battery from the charger.

Miscellaneous

• Disconnect the power after each use and prior to any cleaning or other maintenance.
• Check the parts of the bicycle for any looseness, wear, or damage after use. Tighten, repair, or replace any problematic parts before further use.
• The exterior of the bicycle can be cleaned with a soft damp cloth. Do not use abrasive or caustic chemicals.
• Lubricate the chain and any moving part using a standard bike lubricant as needed.
• If the bicycle will not be used for an extended period of time, store in a cool dry place inaccessible to children.

Battery Maintenance Warm Tips

After receiving the bike should charge it first.

Correct Charging Method

1. After receiving the electric bike, charge the battery first. Start riding after fully charging.
2. The plugs at both ends of the charger should be connected to the battery first, and then to the power supply.
3. If the green light is displayed after the charger is connected for the first time, it may be that the power supply is not connected properly. Try reconnecting; the red light shows that it is charging normally.

• The battery should be charged in time on the day after the battery is exhausted during the ride on the day.
• Make sure to fully charge the battery every 3 months even in the case of infrequent use.

LCD Instrument Use Instructions

Please read the operation manual in detail before using the LCD Instrument. This manual will guide you to use the instrument correctly to achieve a variety of vehicle control and vehicle status display functions.

1. Function overview and functional area layout

1.1 Function overview

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

• Battery level indicator
• Assist level adjustment and indication (levels ECO, MID and HIGH)
• Speed indicator
• Walk boost mode
• Distance indicator (including trip distance and ODO)
• Error code indicator
• Personalized parameter settings (e.g., wheel diameter, speed limit, etc.)
• Factory default parameter recovery function

1.2 Functional area layout

A diagram shows the LCD display layout with indicators for Speed, Distance, and Battery level, along with units (km/h, MPH, km, mile) and assist levels (ECO, MID, HIGH).

1.3 Button definitions

There are three buttons on the operating unit of display YL81C: the on/off button, plus button (+), and minus button (-).

2. General operation

2.1 Power on/off

By pressing and holding the power button, the display will start and the controller's power will be turned on. In the power-on state, pressing and holding the power button will turn off the e-bike. In the power-off state, the display will no longer use battery power, and its leakage current will be less than 1uA. If your e-bike is not used for more than 10 minutes, the display will be automatically powered off.

2.2 Display interface

After the display is turned on, it shows real-time speed (km/h) and trip distance (km) by default. Pressing the button switches the display between trip distance (km) and ODO (km). When the TRIP light is on, the trip distance is displayed; when the ODO light is on, the ODO is displayed.

2.3 Walk boost mode

Long press and hold the button to enter the walk boost mode. Your e-bike will run at a constant speed at the promoted speed, simultaneously displaying ECO, MID, and HIGH cycle jumps. Release the button to stop the power output immediately and restore to the state before walk boost. The walk boost mode can only be used when pushing the electric bicycle; do not use it while riding.

2.4 Assist level selection

By pressing the +/- buttons, the e-bike assist level will be switched to change the motor output power. There are three assist levels available: ECO, MID, and HIGH.

2.5 Battery level indicator

The battery level indicator consists of four segments. When the battery is fully charged, all four segments are on. In case of undervoltage, the last segment of the battery indicator will flash, indicating the battery needs immediate charging.

2.6 Error code indicator

When a fault occurs in the electronic control system of your e-bike, the display will automatically indicate the error code in the distance area in the format of E0**. Detailed definitions of error codes are shown in Schedule 1. When an error code appears on the display interface, please conduct troubleshooting in time. Otherwise, your e-bike will not work normally.

3. Personalized parameter settings

Each setting needs to be done with the bicycle stationary.

The personalized parameter setting procedure is as follows:

1. When the display is ON and the speed shows 0, press and hold the power button and the minus button (-) simultaneously for more than 2 seconds to enter the personalized parameter setting interface.
2. Press the +/- buttons to toggle between the personalized parameter setting interface, and press the power button to enter the parameter changing state.
3. Press the +/- buttons to select the parameter; long press the + button for addition operation, long press the - button for subtraction operation.
4. Press the power button to save the parameter settings and return to the personalized parameter setting interface.
5. Long press the power button to save the parameter settings and exit the personalized parameter setting interface.

The following options are available on the personalized parameter setting interface:

Note: The voltage parameter cannot be changed; it is settled by default.

3.1 Backlight luminance setting

01P is the backlight luminance setting. Parameters 1, 2, and 3 are available, representing backlight luminance: 1 for minimum, 2 for standard, and 3 for maximum. Press the power button to enter the parameter modification interface. Press the +/- buttons for parameter selection. Press the power button to save the parameter and return to the selection interface of general setting options.

3.2 Metric and Imperial setting

02P is the metric and imperial setting: 00 for metric and 01 for imperial. Press the power button to enter the parameter changing state. Press the +/- buttons to select the parameter and press the power button to save the parameter setting and return to the personalized parameter setting interface.

3.3 Rated voltage setting

03P is the rated voltage setting. The available rated voltage range is: 24V, 36V, 48V, 60V. Press the power button to enter the parameter changing state. Press the +/- buttons to select the parameter and press the power button to save the parameter setting and return to the personalized parameter setting interface.

3.4 Auto Sleep Time Setting

04P is the auto sleep time setting. To save battery power and reach a higher range, this display will be turned off after it has not been used for a time. The adjustable range is: 1~60min; 00 means no auto shutdown. The factory default setting is 10 minutes. Press the power button to enter the parameter changing state. Press the +/- buttons to select the parameter and press the power button to save the parameter setting and return to the personalized parameter setting interface.

3.5 PAS level setting

05P is the Pedal assist level setting. The available PAS level settings are: 0~3, 1~3. Press the power button to enter the parameter changing state. Press the +/- buttons to select the parameter and press the power button to save the parameter setting and return to the personalized parameter setting interface.

3.6 Wheel diameter setting

06P is the wheel diameter setting. The adjustable wheel diameter range is: 1~32inch. Press the power button to enter the parameter changing state. Press the +/- buttons to select the parameter and press the power button to save the parameter setting and return to the personalized parameter setting interface.

3.7 Number of speed sensor magnets setting

07P is the speed sensor magnet number setting. The adjustable speed sensor magnet number range is: 1 ~ 255 pcs. Press the power button to enter the parameter changing state. Press the +/- buttons to select the parameter and press the power button to save the parameter setting and return to the personalized parameter setting interface. Note: The number of speed sensor magnets cannot be changed; the default setting is 12.

3.8 Speed Limit Setting

08P is the speed limit setting. The adjustable speed limit range is: 1~ 100km/h. (The maximum adjustable speed limit varies by different protocols). Press the power button to enter the parameter changing state. Press the +/- buttons to select the parameter and press the power button to save the parameter setting and return to the personalized parameter setting interface.

3.9 Start-up setting

09P is the start-up setting. The display can choose the following start modes: 00 → zero start, 01 → non-zero start. Press the power button to enter the parameter changing state. Press the +/- buttons to select the parameter and press the power button to save the parameter setting and return to the personalized parameter setting interface.

3.10 Drive mode setting

10P is the drive mode setting. The available drive modes are: 00 → Pedal assist only, 01 → Electric only, 02 → Both Pedal assist and electric. Press the power button to enter the parameter changing state. Press the +/- buttons to select the parameter and press the power button to save the parameter setting and return to the personalized parameter setting interface.

3.11 Pedal assist sensitivity setting

11P is the pedal assist sensitivity setting. When set to higher numbers, it will take more crank rotations to activate the motor. On lower numbers, it will take little crank rotation to activate the motor. The adjustable range is: 1~24. Press the power button to enter the parameter changing state. Press the +/- buttons to select the parameter and press the power button to save the parameter setting and return to the personalized parameter setting interface.

3.12 Pedal assist strength setting

12P is the Pedal assist strength setting. The Pedal assist strength is the relative strength of the PWM signal from the controller when starting to activate pedal assist. The adjustable range is 0 ~ 5. 0 is the weakest strength and 5 is the strongest. Press the power button to enter the parameter changing state. Press the +/- buttons to select the parameter and press the power button to save the parameter setting and return to the personalized parameter setting interface.

3.13 Number of pedal assist sensor magnets setting

13P is the number of pedal assist sensor magnets setting. The adjustable range: 5- 12 pcs. Press the power button to enter the parameter changing state. Press the +/- buttons to select the parameter and press the power button to save the parameter setting and return to the personalized parameter setting interface.

3.14 Controller Current Limit Setting

14P is the controller current limit setting. The adjustable range is: 1~50A. Press the power button to enter the parameter changing state. Press the +/- buttons to select the parameter and press the power button to save the parameter setting and return to the personalized parameter setting interface.

3.15 Battery under voltage value setting

15P is the battery under voltage setting. The value can be adjusted based on the current rated voltage. Press the power button to enter the parameter changing state. Press the +/- buttons to select the parameter and press the power button to save the parameter setting and return to the personalized parameter setting interface.

3.16 ODO resets setting

16P is the ODO resets setting. The display can choose the following: 00 → non reset, 01 → reset. Press the power button to enter the parameter changing state. Press the +/- buttons to select the parameter and press the power button to save the parameter setting and return to the personalized parameter setting interface.

3.17 6km/h walk boost setting

17P is the 6km/h walk boost setting. The display can choose the following: 00 → turn off walk boost function, 01 → turn on walk boost function. Press the power button to enter the parameter changing state. Press the +/- buttons to select the parameter and press the power button to save the parameter setting and return to the personalized parameter setting interface.

3.18 Power-on password setting

Press the power button to enter the parameter changing state. Press the +/- buttons to select the parameter. PSd-y means the power-on password is activated while PSd-n is off. Press the power button to confirm the mode and enter the state of setting the four digits power-on password or exit to the personalized parameter setting interface. In the password setting mode, the adjustable digit will flash. Press the +/- buttons to select the parameter and press the power button to save the numbers and go to the next digit setting. Long press the power button to save the parameter setting and return to the personalized parameter setting interface after setting the four digits in turn.

4. Shortcut operation

4.1 Restore factory default parameter settings operation

dE is the restore factory default parameter settings. dE-Y is to restore default settings, and dE-N is not to restore. Enter into the main setting interface and keep the speed at 0. Press and hold the power button and the plus button (+) simultaneously for 2s to enter the restore factory default setting interface. Pressing +/- buttons to toggle to dE-Y. Then after pressing the power button to confirm, the display will show dE-0 for a few seconds and then automatically start to restore the factory default settings. The display will automatically exit to the setting interface after the restoration.

4.2 Trip odometer reset operation

The display can record trip odometer and odometer. Trip odometer is not automatically reset after turning off. The trip odometer needs to be reset manually. Enter into the main setting interface and keep the speed at 0. Press and hold the power button and the minus button (-) simultaneously for 2s to reset the trip odometer. The main interface will flash during the reset process.

5. Considerations

• Please use safely, and do not plug or unplug the display when it is powered on.
• Please avoid bumping as far as possible.
• Please do not alter the background parameter settings of the display at will, otherwise normal riding cannot be guaranteed.
• If the display fails to work normally, it should be repaired as soon as possible.
• Due to product upgrades of the Company, part of the displayed contents or functions of the product you bought may be different from the manual, depending on the actual model.

6. Error Code Definition

When a fault occurs in the electronic control system of your e-bike, the display will automatically indicate the error code in the distance area in the format of E0**. Detailed definitions of error codes are shown in Schedule 1.

Schedule 1: Error Code Definition (YL-02 Error codes)

Error code 04

Reason: E04 indicates throttle failure.

Suggest Solution: Please check whether the wire of the throttle is not connected, whether it is damaged or loose. If it is loose, reinsert the wiring harness connected to the throttle (The wiring harness is waterproof and can be plugged in by hand). If damaged, replace with a new throttle.

Notice: Do not exceed the range of rotation to prevent damage to the throttle.

Error code 02

Reason: E02 indicates communication failure.

Suggest Solution: Replace the controller.

Notice: Do not ride uphill for a long time and do not use the electric mode all the time. The electric mode and power-assisted mode need to be used in conjunction with switching.

Error code 01

Reason: E01 indicates Controller failure.

Suggest Solution: Replace the controller.

Notice: Do not ride uphill for a long time and do not use the electric mode all the time. The electric mode and power-assisted mode need to be used in conjunction with switching.

Throttle not work in throttle mode

1. Check whether E04 is displayed on the instrument. If E04 is displayed and the power assist is normal, replace the handlebar. How to judge the power assist: with the instrument turned on, only use the pedals to ride without turning the throttle to see if the motor is working.
2. If E04 is not displayed, check whether there is power assist or not (Long press and hold the - button on instrument). (1) No power assist, replace the rear wheel. (2) With power assist, replace controller.

Pedal assist cannot be set properly

1. Adjust the power assist to the max level 5 by pressing the + button on the instrument. Then try riding again. Generally, the assist can be activated after 2-3 laps of riding. Video example: https://youtu.be/kpJavv9xABg
2. If it has been adjusted to the max assist level, it may be a problem with the sensor. Sensor needs to be replaced.

PAS mode can't last

Open the controller box and check whether the connection between the sensor and the controller is loose or not in good contact.

Pedal assist cannot adjust speed

Re-adjust the instrument parameters according to the initial settings. P07 is adjusted to 6 (6 magnets).

Pedal-assisted riding speed in different level

• level 1: 12mph (19km/h) 60%
• level 2: 14mph (22km/h) 70%
• level 3: 16mph (25km/h) 80%
• level 4: 18mph (28km/h) 90%
• level 5: 20mph (32km/h) 100%

Bicycle Parts Warranty List

The warranty is natural wear, except for man-made damage and irresistible causes. You need to provide broken sample parts, send us photos and videos with Bike Numbers.

FAQ and Suggest Solution

FAQ and Suggest Solution