KZKO's replacement board covers the whole BBS family in one range, from a 36V 250W BBS01 unit to the 48V 1000W board a BBSHD needs. It ships with wires, connectors and mounting hardware, and it comes in old and new housing sizes, which is the detail that decides whether it closes up in your motor.
One KZKO controller range covers nine ratings across three motors, and the default setting is a new-version 48V 500W board. That is a BBS02 rating. A BBSHD owner who clicks through without changing it receives a board built for half the power of the motor it goes into.
| Motor | Ratings offered |
|---|---|
| BBS01 / BBS01B | 36V 250W, 36V 350W, 48V 350W |
| BBS02 / BBS02B | 36V 500W, 48V 500W, 48V 750W |
| BBSHD | 48V 1000W |
The BBSHD row has one entry, and it is the only one to order for an HD. The same motor also appears on labels as BBS03 or G320; all three names mean the heavy-duty 1000W motor.
BAFANG and 8FUN in the name refer to the same maker, as 8FUN is Bafang's own brand. KZKO builds its boards as replacements for that family, so the fit follows Bafang's own motor naming.
If your motor label is gone, the old board usually carries its rating on a sticker. An HD board reads 48V and 1000W; anything lower means the motor was fitted with the wrong part before, or it is not an HD at all.
The BBS02 vs BBSHD comparison helps tell the two motors apart by size and chainring mount if the labels have worn off.
| Spec | Value |
|---|---|
| Brand | KZKO |
| Type | BAFANG/8FUN mid-drive motor controller replacement |
| Motors | BBS01, BBS01B, BBS02, BBS02B, BBSHD |
| BBSHD option | 48V 1000W |
| BBS02 / BBS02B options | 36V 500W, 48V 500W, 48V 750W |
| BBS01 / BBS01B options | 36V 250W, 36V 350W, 48V 350W |
| Voltage range | 36V to 48V |
| Power range | 250W to 1000W |
| Housing versions | Old and new; sizes differ |
| Ports | Some new-version boards omit the gear sensor and light ports |
| Default configuration | New version, 48V 500W |
| In the box | Controller, wires, connectors, mounting hardware |
| Before ordering | Confirm your controller version |
Bafang has changed the controller shape over the years, and KZKO follows that split with old and new versions. The two differ in size, so a new-style board may not close up inside an old-style motor cap, and the reverse holds too. A cap that will not seat flat leaves a gap for water right above the rear wheel's spray.
The second catch is ports. Some new-version boards arrive without the gear sensor and light ports. KZKO notes they still work with the motor, but you lose those two functions.
Riders on a 1000W HD with a derailleur drivetrain gain a lot from a shift sensor. A motor pushing full current through a shift strips teeth off cassettes, so keeping the gear sensor port is worth an extra question before you order.
Lights matter for commuters. A headlight wired through the controller switches on from the display, which is tidier than a separate battery lamp on the bars.
Shift sensors and cassette wear on a 1000W motor are the subject of the chainring and drivetrain guide.
KZKO packs the board with wires, connectors and mounting hardware, so the job does not stall for a missing screw. The controller sits in the rear cap of the motor, and on most frames the motor can stay in place for the swap. Budget an hour and a clean, well-lit bench.
If the old gasket has hardened or split, replace it now. A rubber controller gasket is shaped to the HD cap and keeps the new board dry.
The fresh board starts with factory settings. The launch, assist levels and cutoff you tuned on the old controller are gone, so reload them through a 5-pin programming cable before the first proper ride.
Watch for two signs after the swap. A motor that stutters at start usually has a Hall sensor plug half seated; a motor that runs but will not respond to assist changes often has a display or harness plug loose rather than a faulty board. Both fixes take minutes with the cap open again, so recheck the plugs before assuming the part is bad.
For a connector-by-connector diagram, see the BBSHD wiring guide.
Three replacement ranges cover the BBSHD, and they differ more in the details than in the core rating. Each offers a 1000W HD board. What changes is who makes it, how clearly the range states housing and ports, and what comes bundled with the board.
| Board | HD option | What sets it apart |
|---|---|---|
| KZKO | 48V 1000W | Old and new housings; wires and mounting hardware included |
| Bafang replacement | 48V 1000W | OEM parts; lead version is a 48V 750W BBS02B board |
| mGYDY | 48V/52V 1000W | UART, alloy case, labelled for 52V |
KZKO's advantage is the old-housing option and the hardware in the box, useful for an older motor that has lost screws over the years. Bafang's board brings OEM parts. The mGYDY board carries an explicit 52V label for riders on bigger packs.
For a touring build far from a bike shop, the KZKO box makes a sensible spare. The board, wires and every screw needed for a roadside swap travel together, and the whole kit fits in a frame bag.
Whatever you pick, bag and label the old controller. A dead board with a readable sticker settles rating and housing questions for the next order faster than any description can.
A like-for-like board restores stock performance. Riders who want more current should read the heat warnings in the 1000W explainer before choosing a specialist high-current controller.
The 48V 1000W board. The default 48V 500W setting is a BBS02 rating.
They differ in size, so a new-style board may not close up in an old-style motor cap. Photograph your old board and confirm the version before ordering.
Some new-version boards omit the gear sensor and light ports. They still run the motor, but check with KZKO if you use either.
Yes. The box holds the controller, wires, connectors and mounting hardware.