E-scooter
KS4 Pro
- Years
- 2023-
- Type
- commuter
- Motor
- single 500W hub (750W peak)
- Battery
- 36V 417Wh
Model details from the Pedalwise device catalog (source). Check your own manual before you rely on a spec.
Guides for the KS4 Pro
- Hiboy S2, S2 Pro and KS4: display to controller communication error (E3, or E1 on the S2 Lite)TroubleshootingHiboy lists E3 as a display to controller communication problem on the S2 family and KS4, and E1 on the S2 Lite. Check the cable through the stem, then replace parts in Hiboy's order: cable, display, controller.
- Hiboy S2, S2 Pro and KS4: E5 low voltage error or the battery won't chargeTroubleshootingHiboy lists E5 as low voltage protection on the S2 family, KS4 and S2 Lite. Charge fully with a working charger first; if E5 stays after a full charge, Hiboy's fix is a new battery, a shop job.
- Hiboy S2, S2 Pro and KS4: throttle error on the display (E2, or E7 on the S2 Lite)TroubleshootingHiboy lists E2 as a throttle error on the S2 family and KS4, and E7 as the throttle error on the S2 Lite. Rule out a stuck lever and an applied brake, then replace the throttle, a plug-in Hiboy part.
- Hiboy S2, S2 Pro, KS4 and S2 Lite: motor hall error on the display (E7, or E2 on the S2 Lite)TroubleshootingHiboy lists E7 as a motor hall error on the S2 family and KS4, and E2 as the hall sensor error on the S2 Lite. Check the hall plug and motor cable first; Hiboy's fix after that is a new motor wheel.
- Hiboy S2, S2 Pro, S2 Max, KS4 and S2 Lite: error codesReferenceThe codes Hiboy lists for the S2, S2R, S2 Pro, S2 Max, KS4, KS4 Pro, S2R Plus and Max Pro, plus the S2 Lite's different list, with what each means and the first check.
Hiboy guides
General scooter troubleshooting
- Battery dies fast or range droppedTroubleshootingYour e-bike used to go further on a charge. How to tell normal wear and riding conditions from a battery or charger problem.
- Battery won't chargeTroubleshootingThe charger light doesn't change or the battery won't go up. Safe checks on the charger, the outlet and the port, and when to stop.
- Display blank, flickering or frozenTroubleshootingThe handlebar display won't show anything, flickers or freezes. Usually a plug, the battery, water or the display itself.
- E-bike battery care: charging, storage and when to replace itHow-to guideHow to charge, store and check an e-bike battery so it lasts longer and stays safe, plus what to do with one that's worn out or damaged.
- E-bike or scooter won't turn onTroubleshootingNothing happens when you press the power button. Work through the battery, the key and the plugs before assuming the worst.
- Fixing a flat on an e-bike, step by step, and how to get fewer of themHow-to guideFlats on e-bikes are harder than on regular bikes because of hub motors and heavier tires. Step-by-step repair for front and rear hub-motor wheels, plus prevention.
- How to adjust e-scooter brakesHow-to guideCheck and adjust drum, disc and electronic brakes on common e-scooters from Segway, Xiaomi, NIU and Hiboy, using each maker's own instructions.
- How to adjust mechanical disc brakesHow-to guideSet cable tension, center the caliper and set pad clearance on cable-pulled disc brakes, following Park Tool's method for the common caliper types.
- How to bed in new disc brake pads and rotorsHow-to guideBed in new disc brake pads or rotors before your first ride, following SRAM's published stop sequence, and what to do if the brakes stay noisy.
- How to check and replace disc brake padsHow-to guideCheck disc brake pad wear against Park Tool, Shimano and SRAM limits, then remove and fit new pads on hydraulic or cable disc calipers.
- How to check your brake cut-off switches and throttle before you rideHow-to guideA quick pre-ride test that the brake levers cut motor power and the throttle springs back. It is about confirming these safety features work, and getting them fixed if they don't.
- How to check your e-bike or e-scooter chargerHow-to guideMake sure you have the right charger, read its lights the way your maker documents them, spot cord and plug damage, and charge in a safe place. Never open a charger.
- How to clean, check and true disc brake rotorsHow-to guideSpot a contaminated, worn or bent rotor, clean it with what Shimano and SRAM recommend, check the wear limit and straighten light bends with a truing fork.
- How to fix squealing disc brakesHow-to guideTrack down why your disc brakes squeal or howl: water and dirt, contaminated pads, poor bed-in, a rubbing caliper or worn parts, and when to replace pads and rotors.
- How to inspect and clean e-bike and e-scooter connectorsHow-to guideA careful, one plug at a time check of the external connectors on your e-bike or e-scooter: what to look for, how to dry and reseat them, and when to stop and get a pro.
- How to store your e-bike or e-scooter battery for winterHow-to guideLeave the battery partly charged, keep it indoors in a cool, dry, safe spot, and check it during storage. Here is what Bosch, Shimano, Rad, Yamaha, Segway and fire safety groups say.
- How to update your e-bike or e-scooter firmware the official wayHow-to guideUse your maker's own app or your dealer to check for and install firmware updates. Here is how Bosch, Shimano, Segway and Xiaomi do it, and why to skip third-party firmware and speed tools.
- Motor cuts out or power comes and goesTroubleshootingThe motor stops helping on and off, over bumps or on hills. Usually a loose connection, a brake sensor, heat or a tired battery.
- My e-bike or scooter got wetTroubleshootingRode through heavy rain or a deep puddle, or washed it with a hose? What to do now, and the signs that water got in.
- Repair or replace your e-bike? How to decideHow-to guideWhen an e-bike or scooter breaks, repair is often cheaper than replacing it, and it keeps a working machine out of the landfill. How to weigh it up.
- Stop disc brake rub: center the caliperHow-to guideFix a rubbing disc brake by checking the wheel and rotor, then centering a hydraulic or mechanical caliper over the rotor with Park Tool's method.
- Throttle not workingTroubleshootingThe thumb or twist throttle doesn't move the bike or scooter. Simple checks before the throttle or controller gets replaced.