Answer : Adjust the high and low screws of the Derailleur and check the tightness of the shift cable and adjust it to the best suitable situation.

 

Answer 1：Chain is too loose.

Answer 2: Check if the crank and flywheel are on the same level. If not, need adjust it.

Answer 1: Check whether the wheels are twisted or deformed.

Answer 2: Check whether the fixing nut of the handlebar is loose.

Answer 3: Check if the front fork is deformed.

Answer 4: Check if the front wheel are aligned.

 

Answer 1: Check the chain, disc brake and crank if have collision or scraping.

Answer 2：Check if the freewheel is loose or get damage.

Answer 3：Check whether the front wheel and motor bearings are damaged or loose

Answer 1：Check the oil pipe and disc brake to see if have oil leakage, if yes, need replace the oil pipe or disc brake.

Answer 2：Check if the oil pressure is enough, if not need replenish some oil.

 

Answer 1：Check whether the two ends of the lamp line plug-in are in bad contact, and whether the positive and negative poles are connected in reverse

Answer 2：Replace or butt the headlights.

Answer 3：Check battery rear light whether battery loss/bad contact.

 

Answer 1：Motor wire contact is not good, replace the motor wire

Answer 2:  Motor Hall power failure brake lever have bad contact:  replace brake lever

Answer 1: Motor part short circuit: need replace or repair the motor.

Answer 2: Pls replace a controller to test if it is the controller problem, if it is ok, so it is controller problem.

Answer 3: Pls check if the charger output voltage is low or the battery is not fully charged: replace the charger.

Answer 4: The Battery aging: need change new battery.

Answer 1: if you ebike is not use long time,so need first charging it full. 

Answer 2: Pls check if the tire have enough air, if not pls put in some air. 

Answer 3: Check if the brakes are too tight and rub the discs/rims: pls adjust the brakes to suitable situation.

Answer 4: Check if the temperature is too low: If the temperature is too cold, then the battery cannot release the energy full.

Answer 1：Please check if the brake is locking.

Answer 2:  Please check if the tyre have enough air.

Answer 3 pls check if the battery voltage is enough.