KAYOBA 021290 Electric Bicycle Instruction Manual

: June 11, 2024
: KAYOBA

KAYOBA 021290 Electric Bicycle Instruction Manual

Jula AB reserves the right to make changes to the product. Jula AB claims copyright on this documentation. It is not allowed to modify or alter this documentation in any way and the manual shall be printed and used as it is in relation to the product. For the latest version of operating instructions, refer to the Jula website.

WWW.JULA.COM

JULA AB
BOX 363, 532 24 SKARA, SWEDEN

KAYOBA 021290 Electric Bicycle - EU DECLARATION OF
CONFORMITY KAYOBA 021290 Electric
Bicycle - Fig 1,2 KAYOBA
021290 Electric Bicycle - Fig 3,4,5,6

SAFETY INSTRUCTIONS

WARNING!
Like all other mechanical equipment, a bike is exposed to wear when in use. Different materials and components react in different ways to wear and stress. If the life span of any part of the bike (including the frame, forks and components) has been exceeded there is a risk of the part suddenly breaking, and that you lose control and fall off. Cracks, scratching or changes in color in areas exposed to high levels of stress indicate that the component has reached the end of its useful life and should be replaced.

The electric bike is a vehicle. Always follow local traffic regulations. The electric bike is not designed to take passengers. Reduce your speed and increase the distance to other road users in rain, snow or slippery conditions.
You should not attempt to dismantle parts from the bike for maintenance. Contact a qualified service technician.
Do not ride through pools of water or other accumulations of water. Water can penetrate into the hub motor and cause short-circuiting and irreparable damage.
The two metal connector plates on the back of the battery box are the battery’s positive and negative terminals. Do not touch the battery terminals, especially with wet hands. Make sure that metal objects do not come into contact with the battery terminals as this can cause short-circuiting and result in electric shock, severe burn injuries and damage to the battery.
Never allow persons who are not familiar with electric bikes, or who have not read these instructions, to use this product.
Do not modify the product.

CHECK BEFORE USE

Check that:

The types are in good condition and have the correct type pressure. See marking on side of type for recommended pressure.
The battery is charged.
The stem, handlebars and saddle post are correctly fitted and tightened.
The axle nuts are correctly tightened.
The bell is working.
The rims are in good condition and undamaged. A worn rim is a safety risk and should be replaced.
Screw unions and components are properly tightened and not worn or damaged.
The seat is comfortably adjusted.
The brakes are working properly.
The steering does not jam, or has too much play.
The wheels are not warped and the wheel bearings are correctly adjusted.
The wheels are properly attached in the back/front forks.
The pedals fit properly in the crank arms.
The gears are correctly adjusted.
All the reflectors are fitted.
After adjusting, check that all screw unions are correctly tightened and that the wires are undamaged and correctly drawn along the frame.
The maximum load including cyclist and baggage is 130 kg.
Check the function of the brakes. Use the brake handle on the left side of the handlebars to brake the front wheel, and use the brake handle on the right side to brake the back wheel.

BATTERY AND CHARGER

WARNING!
The electric bike has a lithium-ion battery. Never charge the battery with any other charger than the one supplied with the battery. Using another charger to charge the battery can cause it to catch fire, or explode. If your charger is damaged or lost, contact the nearest Jula store for a replacement charger.

The battery is half-charged when new. Charge the battery for 10-12 hours the first three times.
Charge the battery when the battery charge is low.
Make sure the charger voltage corresponds to the mains voltage.
Do not open the charger, the charger is a high-voltage unit.
Never touch the two battery terminals at the same time this can cause an electric shock.
Never take the battery out of the electric bike when charging.
Charge the battery for at least 2 hours every three months. Failure to do this will invalidate the warranty.
Protect the battery from contact with liquid or metal objects.
Never charge the battery in the vicinity of small children.
Never use the charger in dirty, wet or damp conditions. Avoid charging the battery in direct sunlight.
Do not use the charger during thunderstorms.
Only use the charger in cool and well-ventilated areas.
Do not expose the battery to heavy vibrations or knocks.
Opening the battery will invalidate the warranty.
Never short-circuit the battery’s charging or discharging terminals.
Never attempt to charge the battery via the discharging terminals or discharge the battery via the charging terminals.
Do not expose the battery to excessive heat or naked flames. Do not burn the battery.
Do not expose the battery to water or moisture. Protect the battery’s charging and discharging terminals from rain, flooding or immersion in water.
Operating temperature when charging the battery: 0 to 45°C.
Operating temperature when discharging: 20 to +45°C.
Relative humidity when discharging: 80%.
Store the battery out of the reach of children and animals.
If the battery is not going to be used for some time, remove it from the battery holder and store separately.
Contact the retailer if you have any questions concerning the battery.
Never dismantle batteries or cells.
Follow the markings on the battery.
The charger should be placed at least 1 metre from computers, television receivers, whitegoods and other electrical equipment while charging is in progress.
The charger is only intended for indoor use. It must only be used in a dry and well-ventilated area with a maximum temperature of 45°C.
Disconnect the charger immediately if it emits an abnormal smell during charging, and take it to your dealer.
The battery must only be charged with the charger recommended by the manufacturer. The charger must only be used for the battery for which it is intended, not for other batteries from other manufacturers.
Do not use the charger in dusty or damp conditions, or where it cannot remain stable.
When the battery is fully charged, first disconnect the charger from the mains and then disconnect it from the battery.
Make sure that nobody, especially children, touches the charger while charging is in progress.
Do not place any objects on the charger.
Make sure your hands are not wet when connecting or disconnecting the charger.
Do not turn or move the charger or battery while charging is in progress.
Do not use the charger in direct sunlight.
Do not disconnect the charger from the battery while charging is in progress.
Do not carry out any maintenance on the bike while charging is in progress.
Do not connect the charger to the mains if it is not connected to the battery.
The electric bike works reliably in all kinds of weather, but the electrical components and/or motor can be damaged during prolonged or excessive exposure to water.
Do not touch the electrical components with wet hands, or touch the positive and negative terminals on the battery at the same time; short circuiting can result in personal injury.
If there is a fault on any of the electrical components, consult a specialist. Do not attempt to repair the fault yourself.
Never use the electric bike for riding on extreme terrain, jumping, or carrying heavy loads. This can damage the electric bike and result in personal injury.

SERVICE

Only use identical spare parts when replacing parts that are essential for safety. Contact an authorized service center for original parts. This will guarantee that the bike remains safe to use.

ROAD SAFETY

Always wear an approved bike helmet.
Follow local traffic regulations.
Follow the laws and regulations that apply in your country when riding an electric bike.
The electric bike is designed for normal roads and in normal traffic.
The bike is intended for one person.
In slippery conditions note that the braking distance can be longer than normal to stop the electric bike safely.
Do not put anything on the bike that can get caught up and obstruct the functions of the bike.
Use lights and reflectors when cycling in the dark.
Do not ride on the same side as oncoming traffic.
Do not ride alongside another bike.
Do not give rides on bikes not intended for this.
Do not swing out into traffic.
Do not hang anything from the handlebars that makes it difficult to steer, or which could fasten in the front wheel.
Do not hang onto another vehicle.
Do not ride too close to a vehicle in front.
The braking power is reduced by water and ice.
Cycle more slowly in wet weather and brake earlier than you normally do in dry weather.
Follow local regulations when cycling in the dark. The bike must have a front lamp with a white light and a back lamp with a red light, plus the necessary reflectors.
Wear bright clothes and a high-visibility jacket if possible.
Check that the bike’s reflectors are correctly positioned, properly attached, clean and not obscured. Replace damaged reflectors immediately.

WARNING!
Like all mechanical components a bike is also exposed to wear and fatigue. Different materials and components show signs of wear and fatigue in different ways. If a mechanical component has reached the end of its useful life this can cause the component to suddenly malfunction, which can result in personal injury. Pay attention to changes in color, cracks and scratches at exposed points. Such signs can be indications that components need to be replaced.

SYMBOLS

TECHNICAL DATA

KAYOBA 021290 Electric Bicycle - TECHNICAL DATA

DESCRIPTION

1. Frame
2. Front fork with shock absorber
3. Wheel reflector
4. Saddle post
5. Stand
6. Tyre with rim
7. Handlebars
8. Adjustable head
9. Handle
10. Saddle
11. Disc brake, front
12. Disc brake, rear
13. Brake handle, front/rear
14. Back gear
15. Gear selector, front/back
16. Front gear
17. Sprocket and crank
18. Chain
19. Pedal
20. Battery
21. Motor
22. Reflector, front
23. Reflector, rear
24. Display
FIG. 1

ASSEMBLY

SADDLE AND SADDLE POST

Fit the saddle post in the saddle tube and lock in place with the quick- release lock.

WARNING!
Do not raise the saddle over the marking for the max height on the saddle post. The marking means that at least one third of the saddle post must be inserted in the saddle tube.

FRONT WHEEL

Fit the front wheel by aligning the wheel in the bottom part of the front fork, making sure that the brake disc goes in between the brake pads. Fit the axle with the quick-release and fasten the nut on the opposite side. Secure the wheel firmly in place with the quick-release.

HANDLEBARS

Put the handlebars in the column recess, clamp in place and tighten the four screws.

WARNING!
Do not raise the handlebars over the marking for maximum height.

PEDALS

Screw the pedals onto the pedal arms.. Make sure to fit them the right way round, they are threaded in different directions so they will not come loose. The pedals are marked with R for right and L for left.

LIGHTS

Use good quality batteries for the lights.

USE

BEFORE USING FOR THE FIRST TIME

The battery is half-charged on delivery. Charge the battery for 10-12 hours before using for the first time the next two or three times.
Be careful when using the power assistance the first time because the electric bike accelerates faster than a normal bike.
Ride the bike on a smooth surface first to get used to the acceleration.

WARNING!

This electric bike runs on a lithium-ion battery. Never charge the battery with any other charger than the one supplied with the bike risk of fire or explosion.
Never remove the battery from the bike when charging is in progress.

TO BEAR IN MIND WHEN RIDING

Follow local traffic regulations.
Wear a bike helmet.
Be careful when braking, brake first with the more gentle back brake.
The power assistance works up to max 25 km/h and then switches off. When the speed drops below 25 km/h and the rider continues to pedal the power assistance starts again.
Do not use the power assistance in slippery conditions, or on loose gravel or clay.
Switch off the power assistance if the electric bike behaves “unusually” to avoid damaging the electrical system.
The front and back lights have two modes constant and flashing. Press the light button once for constant and twice to flash.
Remember to switch off the bike and the lights after use.

WARNING!

Check that the front and back brakes are working properly.
Check that the front and back wheels are properly screwed on and that there is no play.
Check that the pedals, saddle and handlebars are properly screwed on and that there is no play.
Check that the quick-release on the saddle is properly tensioned and that there is no play.

RIDING THE BIKE

Press the power switch on the battery and press ON on the control panel.
The motor is activated when you start pedaling and assists all the time while the battery lasts, and switches off when braking, or as soon as you stop pedaling.
Adjust the assistance level of the electric motor by pressing the MODE button. The power assistance stops at 25 km/h and resumes when the speed drops below 25 km/h, assuming that you continue pedalling and the battery is not flat.
The electrical system on the bike has a low voltage protection that switches off the power if the battery drops below a certain level.

TOTAL DISTANCE

The total distance per full charge is measured on the horizontal at 20°C, in calm conditions, at a speed of 25 km/h and with the bike loaded with a total weight of 75 kg.
The actual real distance varies with the load, road conditions, wind speed, temperature, biking behavior (number of starts etc.), type pressure and correct battery charging routines.
To obtain the longest possible distance all the above factors should be checked and adjusted as far as is possible avoid overloading, pedal smoothly and with the correct type pressure, and charge the battery regularly.

CHARGING THE BATTERY

Battery mounted on the bike

1. Switch off the bike on the control panel and with the battery’s power switch.
2. Connect the charger to the charging socket on the battery.
3. Plug the charger into a power point.

WARNING!
Do not connect the charger to a power point if it is not connected to the battery.

Battery removed from the bike

Switch off the bike on the control panel and with the battery’s power switch.
Turn the key to unlock the battery.
Lift up the battery to release it from the bike.
Connect the charger to the charging socket on the battery.
Plug the charger into a power point.

WARNING!
Do not connect the charger to a power point if it is not connected to the battery.

Charge indicator

The charger light turns red while charging is in progress.
When the battery is fully charged the charger light turns green.
Flashing alternately red and green indicates a fault. Contact an authorized service center.

DISPLAY

Summary of functions

Battery charging indicator
Trip meter
Speedometer (shows instant speed, average speed and maximum speed)
Speed unit
Error code display
Backlight on/off
Assistance level
Distance unit
Parameter settings, e.g. wheel diameter, backlight and top speed limit for assistance.
FIG. 2

Starting and switching off the display

Press the button for 2 seconds to start the display and the control unit. To switch off the display and the electric system on the bike, press the button again for 2 seconds. The display and control unit switch off.

NOTE:
If the bike is not used for 10 minutes the display switches off automatically.

Speedometer

The speedometer can show the instant speed, average speed and maximum speed. The instant speed is shown automatically by default. To switch over, press the buttons and + for 2 seconds. The following is then shown: instant speed (km/h) average speed (km/h) maximum speed (km/h).

1. Instant speed
2. Average speed
3. Maximum speed
FIG. 3

Odometer

The odometer shows the trip distance when the display is switched on. To switch over (trip meter/total distance) press the button . The display then shows: trip distance (km) total distance (km). To reset the trip meter, press the buttons and —.

1. Trip distance (TRIP)
2. Total distance (ODO)
FIG. 4

Backlight

Press the button + for 2 seconds to switch on the backlight. The headlight goes on at the same time. To switch off the light, press the button + for 2 seconds again.
FIG. 5

Selection of assistance level

Press the button + or - to adjust the assistance power of the motor. There are five assistance levels, 1 to 5. 1 is the lowest and 5 is full power. The standard setting is assistance level 1. Three examples of how the assistance levels are shown on the display:

1. Assistance level 1
2. Assistance level 2
3. Assistance level 5
FIG. 6

Battery indicator

The battery charge is shown on the display in five levels. FULL is shown at the top of the battery charge indicator when the battery is fully charged. When the battery is discharged (low battery voltage) the letter E is shown at the bottom of the battery indicator and the indicator flashes. The battery must then be charged.

1. Fully charged battery
2. Partially discharged battery
3. Fully discharged battery (the indicator
flashes) FIG. 7

Error codes

Error codes are shown automatically if there is a fault in the control electronics. Check the part of the bike to which the error code refers.

Error code 21: circuit fault
Check that all connections are correct, undamaged and not short-circuited.

Error code 22: motor control fault
Check that motor’s starter lever is in neutral.

Error code 23: motor circuit fault
Check that motor is correctly connected to the control unit and that all the connections are intact.

Error code 24: signal fault hall sensor for motor
For control unit without hall sensor, check that motor is correctly connected. For control unit with hall sensor, check that the hall sensor is correctly connected.

Error code 25: brake fault
Check that the brakes are not applied, and have gone fully back before switching the display unit on.

Error code 30: communication fault
Check that all the cables between the display unit and the control unit are correctly connected.

Settings

With the display switched on, press the buttons + and - at the same time for 2 seconds to go to the settings menu. To leave the settings menu, press the button for 2 seconds.

Setting the wheel diameter
Press the button + or to set the correct wheel diameter. Wheel diameter settings: 16 inch, 18 inch, 20 inch, 22 inch, 24 inch, 26 inch, 700C, 28 inch. The standard setting is 26 inch. Press the button to confirm the wheel diameter setting and to go to the next setting.
FIG. 8

Setting the top speed limit
A top speed limit can be set for the power assistance as a safety function. The electric motor switches off when the speed goes over this limit. The top speed limit can be set from 12 to 40 km/h. The standard setting is 25 km/h. Press the button + or to set the required top speed limit. Press the button to confirm the setting. Go to next setting.
FIG. 9

Setting the backlight
“bL” stands for backlight. Level 1 is low brightness. Level 2 is medium brightness. Level 3 is high brightness. Press the button + or to set the required brightness. Press the button
to confirm the setting.
FIG. 10

BATTERY

1. Battery indicator
2. Button 0/1 to start (1) and switch off (0) the battery.
FIG. 11

START CYCLING

Start pedaling, the electric motor starts and assists while the pedaling continues.
Adjust the assistance from the electric motor with the mode button. The power assistance stops when the rider stops pedaling, when the brake is used, or when the speed reaches over 25 km/h.
The bike has eight gears. Change gear by turning the inner part of the right handle on the handlebars.

Note :

Be careful when using the power assistance the first time because the electric bike accelerates faster than a normal bike.
Ride the bike on a smooth surface first to get used to the acceleration.
The electrical system on the bike has a low voltage protection that switches off the power if the battery drops below a certain level.
The total distance per full charge is measured on the horizontal at 20°C, in calm conditions, at a speed of 25 km/h and with the bike loaded with a total weight of 75 kg.
The actual real distance varies with the load, road conditions, wind speed, temperature, biking behavior (number of starts etc.), type pressure and correct battery charging routines.
To obtain the longest possible distance all the above factors should be checked and adjusted as far as is possible avoid overloading, pedal smoothly and with the correct type pressure, and charge the battery regularly.
Be careful when braking, brake first with the more gentle back brake.
The power assistance works up to max 25 km/h and then switches off. When the speed drops below 25 km/h the power assistance starts again.
Do not use the power assistance in slippery conditions, or on loose gravel or clay.
Switch off the power assistance if the electric bike behaves “unusually” to avoid damaging the electrical system.
The front and back lights have two modes: flashing and constant. Press the light button once for constant and twice to flash.
Remember to switch off the lights after use.

SUSPENSION

The suspension on the front fork can be locked (switched off) with a knob on the front fork.

MAINTENANCE

WARNING!
The battery must not be mounted on the bike during maintenance or repairs.

Use a sponge moistened with a mild detergent when cleaning. Do not use acidic detergents, they can damage the bike.
Avoid leaving the bike unprotected in the rain or snow.
If the bike gets wet, wipe it with a towel after use.
If the bike is used on a salted surface, clean it after use with fresh water.
Do not clean the bike with a high-pressure washer risk of water and moisture penetrating into the electrical components and motor.

BATTERY AND BATTERY CHARGER

If the battery is not going to be used for some time it should be kept charged to about 50% (takes about 23 hours of charging for a fully discharged battery) and stored in a dry and well-ventilated place. Failure to do this will invalidate the warranty.
Storage conditions for battery: temperature 20 to +35°C, relative humidity 5 to 65%.
Do not immerse the battery in water. When transported the battery should be packed in its original packaging and protected from knocks and blows, vibration and direct sunlight.
Disconnect the charger from the battery for storage.

CHAIN

Lubrication

The chain should be lubricated at regular intervals with a suitable chain oil. Never let the chain dry out. A dry chain wears more quickly, becomes stiff and can start to rust. Replace a damaged chain.

Clean any dirt off the chain.
Lubricate the chain.
Pedal a few turns so that the oil comes in the links.
Wipe the chain with a cloth or sponge.

Chain tension

A chain that is not properly tensioned can be dangerous. It should not be possible to move the chain more than 1 cm “up or down” at the mid point, but neither should it be over tensioned.

Undo the nuts on the back wheel and pull the back wheel backwards to stretch the chain.
Tighten the nuts. Make sure the wheel is fitted straight.
Check that the wheel is firmly in place.

HUB BEARINGS

Check for play in the hub bearings by holding the rim of the wheel on the bike and moving it from side to side. Adjust any play immediately, otherwise there is a risk of damaging the hub bearings and the wheel.

DISC BRAKES

The wire tension for the disc brakes is adjusted with the adjuster screw on the respective brake handles.

1. Nipple
2. Metal ring
3. Lock nut
4. Adjusting screw
5. Handlebars
FIG. 12

GEARS

The gear wire tension is adjusted with the adjuster screw on the hub of the back wheel. 52

Back gear side view
1. High gear adjuster screw
2. Low gear adjuster screw
3. Adjusting screw
FIG. 13

SPOKES

Spoke tension

The spokes should be equally tensioned round the wheel. Check the spoke tension by squeezing two adjacent spokes on the same side of the wheel together.
Go round the wheel to check if any spokes are loose.
Check that the rims are not warped by spinning the wheels.
Tension loose spokes with a spoke key. If you are not sure how to do this, take the bike to an authorized service center to tension the spokes.

Broken spoke

A warped rim or broken spoke indicates that the wheel is damaged. Take the bike/wheel to a workshop to be repaired.

LUBRICATION

Lubricate regularly as per the instructions to keep the electric bike in good working condition. Make sure not to use too much lubricant risk of it accumulating on the brake discs and pads and reducing the braking power. The speed control, brake pads and rims should be kept free of grease and other lubricants.

Lubricate the chain and derailleur with bike oil at 1 to 2 month intervals, or more often if necessary.
The saddle post should be greased once a year to prevent it getting stuck.
Grease the eccentric brake screw, the front hub and pedals with grease at 1 to 2 month intervals, or more often if necessary, to avoid unnecessary friction.

NOTE:
Make sure not to use too much lubricant risk of it accumulating on the brake discs and pads and reducing the braking power. The speed control, brake pads and rims should be kept free of grease and other lubricants.

REGULAR MAINTENANCE

Run the following checks at intervals of 1 to 2 months:

Check that the stem, handlebars and saddle post are correctly fitted and tightened.
Check that the axle nuts on the wheels are correctly tightened.
Check that the rims are not cracked and that the spokes are in good condition and well tensioned.
Check that the tires are not worn or damaged.
Check that the type pressure is correct.
Check that the battery contactors on the frame are clean and free from oxide.
Check that the battery is sufficiently charged.
Check that the lights are working properly.
Check that the front and back brakes are working properly.
Check that the wires are well lubricated and that the brake pads are in good condition.
Make sure not to use too much lubricant, otherwise there is a risk of it accumulating on the brakes and reducing the braking power.
Check that the welds on the frame are in good condition and free from rust.