Search found 5527 matches

by d8veh
Sep 19 2020 6:07pm
Forum: E-Bike Technical
Topic: Bafang hub motor harness
Replies: 2
Views: 249

Re: Bafang hub motor harness

I just cut the cables down, solder the wires and heatshrink them.

There are different motor cables depending on the controller connections. You don't say which type you need.
by d8veh
Sep 19 2020 6:02pm
Forum: E-Bike Technical
Topic: Bafang CST gear replacement - HELP!
Replies: 1
Views: 138

Re: Bafang CST gear replacement - HELP!

It goes inside the sun gear. I showed a photo on UK Pedelecs forum.
by d8veh
Sep 19 2020 5:46pm
Forum: E-Bike Technical
Topic: Strange problems with KT controllers and diplays?
Replies: 6
Views: 227

Re: Strange problems with KT controllers and diplays?

There are 5 wires in the cable: Red battery voltage Black ground Blue battery voltage only when the LCD is switched on Green and White Tx and Rx comms The LCD will work as long as it's connected to the red and black wires in the harness. It works completely independently from the rest of the bike li...
by d8veh
Sep 19 2020 5:11pm
Forum: E-Bike Technical
Topic: Display wiring
Replies: 2
Views: 162

Re: Display wiring

Red goes to VCC Black to GND White and green will be Tx and Rx, but I can't say which way round. the only way to be sure would be to open the controller and look at the markings where the wires are soldered. They will be the opposite round, so if green is Rx on the controller, it'll be Tx on the LCD...
by d8veh
Sep 17 2020 4:34pm
Forum: E-Bike General Discussion
Topic: 2 Speed Xiongda hubmotor
Replies: 1604
Views: 213746

Re: 2 Speed Xiongda hubmotor

It's possible, but desn't make any sense at all. These motors have the advantage that they're small, lightweight and can produce a lot of torque with relatively low power by allowing the bike to run more slowly than a normal motor. Two Q128s would be the same weight, but would blitz a pair of Xiongd...
by d8veh
Sep 15 2020 2:58pm
Forum: E-Bike General Discussion
Topic: EMCT1441 how to connect this controller?
Replies: 5
Views: 94

Re: EMCT1441 how to connect this controller?

Unfortunately, it's different to the common Chinese controllers. Are there markings or components on the other side of the pcb?
by d8veh
Sep 15 2020 12:38pm
Forum: E-Bike Technical
Topic: Controller Throttle Problems
Replies: 7
Views: 153

Re: Controller Throttle Problems

Something doesn't sound right. A throttle hall sensor (SS49) supplied with 5v can only output about 4.2v on the signal wire. Did you measure your 5v supply? Is the battery in your meter run down? Maybe time for a new one.
by d8veh
Sep 15 2020 5:20am
Forum: E-Bike Technical
Topic: Two motors, one throttle, good idea?
Replies: 8
Views: 718

Re: Two motors, one throttle, good idea?

I would generally advise people not to fit a front motor unless there are no other options because it has so many disadvantages over a rear one: Lack of traction; Nope. Works fine for me on my bikes with 1600-1800 max watts and slow windings. It rarely slips, and when it does, it hooks right back u...
by d8veh
Sep 15 2020 4:59am
Forum: E-Bike Technical
Topic: Controller Throttle Problems
Replies: 7
Views: 153

Re: Controller Throttle Problems

You didn't say which throttle it is. Hall sensor throttles normally give out around 1.2v at no twist and 4.2v at full twist. The voltages are dependent on the magnetic field produced by a pair of magnets. With no magnetic field, you get 2.5v (half throttle). To get the 1.2v, a south facing magnet mu...
by d8veh
Sep 15 2020 4:43am
Forum: E-Bike General Discussion
Topic: EMCT1441 how to connect this controller?
Replies: 5
Views: 94

Re: EMCT1441 how to connect this controller?

You need to find which is the ignition wire, if any. For that, you have to open the controller and see which wire is soldered on the input side of the big resistor. If you're lucky, it'll be marked vcc. We can probably help if you take a clear photo of the internals that show where the wires go. No ...
by d8veh
Sep 14 2020 2:23pm
Forum: E-Bike Technical
Topic: Ebike assist level control
Replies: 9
Views: 241

Re: Ebike assist level control

Any KT (Kunteng) controller will give you what you wan. they have what the Chinese call "Torque simulation", which is current control. You can get them form most of the Chinese suppliers, Amazon, Aliexpress, Banggood, etc. The best LCD to go with them is the LCD3 because it gives access to all the s...
by d8veh
Sep 14 2020 2:08pm
Forum: E-Bike Technical
Topic: Turning pedal assist into "constant on."
Replies: 33
Views: 5230

Re: Turning pedal assist into "constant on."

Sorry, I didn't see that, as I haven't logged on for a while due to health issues. I hope you have it sorted by now, but to answer your question. If you bypass the Kingmeter display panel by bridging the red and blue wires, you normally get level 1 PAS and normal throttle operation. You might need t...
by d8veh
Sep 14 2020 1:21pm
Forum: E-Bike Technical
Topic: Two motors, one throttle, good idea?
Replies: 8
Views: 718

Re: Two motors, one throttle, good idea?

I've made several 2WD bikes and even a bike with three motors that had insane acceleration. It's very straight-forward. First, you need a very powerful battery because you'll be pulling a lot more current than normal with two motors. next, you need two controllers. Finally, you only need a single th...
by d8veh
Aug 13 2020 5:26pm
Forum: E-Bike General Discussion
Topic: pedelec conversion with torque sensor
Replies: 4
Views: 273

Re: pedelec conversion with torque sensor

Torque sensor is an unnecessary and expensive complication for riding on the road. It has advantages for off-road riding. Cheapo controllers have speed control on the PAS, so you get max power in all levels, which gives an aggressive and uncontrollable start. What you want is a controller with curre...
by d8veh
Aug 13 2020 5:00pm
Forum: E-Bike Technical
Topic: Bafang G01 number of speedo magnets confusion
Replies: 3
Views: 219

Re: Bafang G01 number of speedo magnets confusion

I've found both 1 and 6 magnets on other types of Bafang motor. It's nothing new. They fall off anyway.
by d8veh
Aug 13 2020 12:25pm
Forum: E-Bike Technical
Topic: Bafang 250w Fat Bike Hub-motor Problem
Replies: 3
Views: 133

Re: Bafang 250w Fat Bike Hub-motor Problem

2old wrote:
Aug 13 2020 11:10am
Doubt anybody can solve it if you can't, but doesn't it almost need to be some internal multi-wire connector has an area with no continuity?
Motors like that don't normally run at all if there's a continuity issue.
by d8veh
Aug 13 2020 9:43am
Forum: E-Bike Technical
Topic: Bafang 250w Fat Bike Hub-motor Problem
Replies: 3
Views: 133

Bafang 250w Fat Bike Hub-motor Problem

I've been helping a guy fix his bike. The battery is fine, it's almost new, as is the rest of the bike. The story is that he fell off the bike and it lost most of its power. I'd estimate the power as around 100w, like it's stuck on level 1. It has independent throttle and PAS. The power is the same ...
by d8veh
Mar 04 2020 2:08pm
Forum: E-Bike Technical
Topic: Bafang BPM 48V500W Clutch Problem
Replies: 7
Views: 995

Re: Bafang BPM 48V500W Clutch Problem

Where are you? I think I have one or two somewhere.
by d8veh
Feb 25 2020 6:15pm
Forum: E-Bike Technical
Topic: Problem opening motor
Replies: 16
Views: 1625

Re: Problem opening motor

It's a Bafang QSWX5. There are one or two tiny grub-screws in the edge just outside the spoke flange that have to be removed first. Most are right-handed threads, but there are some with left-handed ones. You need to make the tool, then use a lot of torque to unscrew it. Heat often helps if it's stu...
by d8veh
Feb 25 2020 6:04pm
Forum: E-Bike Technical
Topic: KT-LCD5 PAS 12 magnet settings
Replies: 11
Views: 868

Re: KT-LCD5 PAS 12 magnet settings

I tried a 12 magnet regular disc and no matter what the C1 setting used it wouldn't work. I've ordered a 10 magnet disc from Aliexpress so will update when that's been tested. Currently I have to turn the pedals more than one full turn before PAS kicks in, so I'm hoping that with more magnets that ...
by d8veh
Feb 25 2020 5:45pm
Forum: E-Bike Technical
Topic: PAS backwards - how to flip?
Replies: 9
Views: 634

Re: PAS backwards - how to flip?

OP has a handed PAS, which will only work on one side in one direction. The only way to reverse direction with one of those is by software in the controller, and AFAIK, only KT controllers have that. If you have a KT controller, it's parameter C1.
by d8veh
Dec 06 2019 11:02am
Forum: E-Bike Technical
Topic: help motor run reverse
Replies: 17
Views: 1633

Re: help motor run reverse

As I said, some controllers have automatic phase and hall sequence detection without the self-learning wires. If you have one of those, it's very difficult to reverse direction because they reverse every change you make in their logic.
by d8veh
Dec 06 2019 10:54am
Forum: E-Bike Technical
Topic: LCD Display Replacement (which is it?)
Replies: 11
Views: 1363

Re: LCD Display Replacement (which is it?)

You're controller is probably an old crappy one. The modern KT ones are a lot better. They make your bike like a new one. If it were my bike, I'd replace both the controller and LCD with a a KT sine wave controller and LCD3. You can get get then from PSWPOwer.com and Topbikekit.com. delivery is quit...
by d8veh
Dec 03 2019 5:56am
Forum: E-Bike Technical
Topic: Q128C replacement freehub body
Replies: 11
Views: 1427

Re: Q128C replacement freehub body

The side-plates come off much easier if you heat up the hub between the spokes with a hot air gun until it's just about too hot to touch.