Setup & Settings

Changing the Speed Unit from KM/H to MPH

One parameter — P02 — and the two settings people change by mistake instead.

Applies to: D-series

Change Speed Unit from KM/H to MPH — if the player does not load, open the video on YouTube.

The setting

P02 controls the speed unit:

Value Unit
0 KM/H
1 MPH

Steps

  1. Power on the bike and open the parameter menu (the display's settings entry).
  2. Navigate to P02.
  3. Change the value — 0 for KM/H, 1 for MPH.
  4. Save and exit the menu properly.
  5. Power cycle — off, then on.
  6. Confirm the speedo now reads in the unit you chose.

Watch out for

The two adjacent settings are not the speed unit, and changing them causes real problems:

If your speedo is reading a plausible but incorrect number, the unit is probably fine and P06/P07 is the real problem. See the P-Setting Guide.

Resetting the CEMOTO Controller to Factory Settings

The FarDriver dongle procedure — and the cases where a reset is the wrong answer.

Applies to: D-series with the FarDriver programmable controller

How to Reset CEMOTO Controller to Factory Settings | FarDriver Tutorial — if the player does not load, open the video on YouTube.

What you need

Item Notes
FarDriver Bluetooth dongle CEMOTO D-Series part — see Spare Parts
FarDriver mobile app Installed on your phone
A charged 12V auxiliary supply Some procedures need the controller held powered

Steps

  1. Locate the controller's programming connector — usually under the side panel or seat area.
  2. Plug in the dongle and power the bike on.
  3. Pair the dongle with the FarDriver app.
  4. Read the current parameters first and save or photograph them. A factory reset discards every value you have set, including any that were correct for your wheel size or voltage.
  5. Issue the factory reset from the app.
  6. Re-verify the critical parameters after the reset — particularly P03 (voltage), P06 (wheel diameter), P07 (magnets), P13 (magnet disk) and P15 (undervoltage). A generic factory profile will not necessarily match your bike.
  7. Power cycle and confirm the bike behaves normally at low speed.

When a reset is the wrong answer

A factory reset is not a diagnostic tool. Do not use it as a first response to an error code.

Situation Do this instead
An error code (E02, E06, E07, E08, E09, E13) Work the specific diagnostic — see Error Code Tutorials
A parameter you changed produced a fault Set that parameter back to its previous value
Intermittent electrical faults Check connectors — see Wiring & Connectors
A genuinely scrambled or replaced controller A reset is the right tool

⚠ Warranty note. Damage caused by parameter values outside specification is not covered. Never use a reset as a way to load a more aggressive profile than the bike is rated for. See Warranty Claims.

How to Limit Speed on a CEMOTO Electric Dirt Bike

Three ways to cap the top speed — and what each one actually does.

Applies to: D-series

How to Limit Speed on Your CEMOTO Electric Dirt Bike | Easy Setup Tutorial — if the player does not load, open the video on YouTube.

The three methods

Method Parameter What it does
Speed limit P08 Caps top speed. 0 = no limit; the value is in km/h
Drive mode P10 0 = power, 1 = electric, 2 = coexist
Start intensity P12 0–5 — how hard the motor comes in from a stop

Steps

  1. Decide which you actually want. If the concern is top speed, use P08. If the concern is how abruptly the bike launches, that is P12, not P08.
  2. Open the parameter menu and navigate to the chosen parameter.
  3. Set the value. For P08, the number is in km/h — 25 km/h ≈ 16 mph.
  4. Save, exit, and power cycle.
  5. Test at low speed in a safe open area, then confirm the cap holds.

A speed cap is not the same as gentler acceleration

A common misconception. Lowering P08 limits how fast the bike will eventually go. It does not change how hard it accelerates up to that speed — the bike still comes off the line just as sharply. For a new or younger rider, P12 is usually the more useful setting.

Watch out for

D-Series P-Setting Guide (P01–P17)

Every controller parameter, what it does, and the handful that cause real faults when set wrong.

Applies to: D-series with the FarDriver controller

D-Series P-Setting Guide in 20 Seconds — if the player does not load, open the video on YouTube.

Before you change anything

⚠ Read this page fully first. Two parameters — P03 (voltage) and P14 (current limit) — can damage the battery, controller and motor if set outside specification. Damage caused by out-of-spec parameter values is not covered by warranty. See Warranty Claims.

Write down the current value of any parameter before you change it.

The parameters

Parameter Setting Notes
P01 Display brightness / backlight Cosmetic
P02 Speed unit — 0 = KM/H, 1 = MPH See Changing the Speed Unit
P03 Voltage level Must match your pack — 36V / 48V / 72V. Wrong value = real faults
P04 Dormancy / sleep timer Minutes before the display sleeps
P05 Backlight brightness Cosmetic
P06 Wheel diameter Affects speedo accuracy
P07 Speed signal magnets 1–255. Wrong value makes the speedo read wrong
P08 Speed limit 0–100 km/h. 0 = no limit
P09 Zero-start / non-zero-start Whether the throttle works from a standstill
P10 Drive mode 0 = power, 1 = electric, 2 = coexist (pedal + motor)
P11 Assist sensitivity 1–24
P12 Start intensity 0–5. How hard the motor comes in from a stop
P13 Magnet disk count 5 / 8 / 12 — must match the PAS disk fitted
P14 Controller current limit Default 12 A, range 1–20 A. Above specification damages the controller and motor
P15 Undervoltage threshold Protects the pack from over-discharge. Do not lower this to chase range
P16 ODO reset Long-press up for ~5 seconds to clear
P17 Cruise control On/off

The three that actually matter

After changing a parameter

  1. Save / exit the menu properly.
  2. Power cycle — off, then on.
  3. Confirm the expected change (speedo unit, speed cap, assist level).
  4. Record what you changed in the Maintenance Log.