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Q100's use two bushings and a nut under the freewheel to set the width. I've used a 6speed freewheel and cut one bushing to fit a 130mm dropout.

Ah, I missed the fact that the LCD9 has a built in throttle! Smart to look it up, Neath! Let's say that KT throttle still uses a analog signal of 1.4V to 4.3V as a throttle signal. Find the three pin plug with the black, red, and blue wire on the controller. Put a voltmeter on the dangling...

You're showing us a picture of the KT controller's display connector. The pink loop is where some people wire in an ignition key. Can't figure out why you have a display connector with a white wire hanging off it. The display connector is only 5 wires. Since this is all one kit, all the parts...

I bought that battery last Fall from the "Official Liitokala Store", not to be confused with the "Official Liittokala Factory Store" or the "Official Liittokala Value Store"I am sure that there are more, and I don't even know if my seller was the original. Liitokala had such a good reputation...

Does your voltage go to zero, if switched off, and connected to the controller? Some switched BMS will have residual voltage across the outout transistors when turned off, but with a small resistive load, it drains away to zero. That's normal and fine. Given that you only changed the case, your...

The SW900 has the same connector wiring as a KT display. I presume an S900 does too. I had an S866 that works with Brainpower controllers, and it has the same wiring as a KT. I've mixed the displays and controllers together when I had them. All will connect to battery power/ground on the...

I own a BBS02 on a full size bike, and never considered a mid motor for a folder. On one hand, it is a simpler install, The controller is inside the motor, so there is no need to locate a box on the frame for electronics. The wiring is also simpler. The tradeoff is I don't need the power of a...

I have this one. It tops out at .12mm strips, which I believe are nickel plated steel. I need to keep the copper probes clean. It seems to punch a lot of power, but it doesn't translate to automatic good welds. Blows holes in thinner strips, I get burn marks on my 50 year old formica desk top...

I got into battery repair this summer, replacing cells in two batteries that had gone unbalanced. I bought an inexpensive portable spot welder. Those deserve a thread of their own. Tradeoffs, the main one being lack of power, requiring thinner nickel strips. For replacing a row of cells, not...

One obsolete design is the Dolphin battery. Too bad. I have a 52V and 36V model. I can still find them on sale occasionally, but I'm not buying a new one, The commercial 10S-2P bottle batteries really limit you on cell capacity. I bought three from Unit Pack Power. The best one used GA cells...

I bought the 13S-3P version of that battery over the summer. Ordered in July from Littokala on their aliexpress page. It came about 9 weeks later. I didn't worry too much. It just showed up one day. It's supposed to be 15AH. I've only used it briefly. I put on 12 miles on a 750W BBS02, to see...

I have some small 36V4AH packs. I often run them in parallel with each other or with larger batteries. No protective circuits. Those are just Y-connectors with diodes anyway. I just use a Y-connector and am careful to check my batteries for full voltage before I connect them. I disconnect when...

You're probably burning 30 wh/mile running a 1000W motor at 20-25 mph. Your calculated rate is 720 wh/15 or 50 wh/mile. You have to derate that 720 wh. It based on a low current draw and using all of the battery. The latter can't happen because I believe the controller shuts off your battery at...

What's the usual torque spec if you have a wrench? I've been using 35 nm (26 ft-lbs) and I still have at least one torque plate on the axles. Some axles on my motors are too short for double torque arms.

The Q128H available from BMSbattery.com has a flange diameter around 140mm. It gets its name from the 128nn spacing between opposite spoke holes. Also available from topbikekit.com, as the Akeima 128. While the extra cost for a rim/spokes is low, the added shipping charges are high, I bought a...

I also swap 36V and 48V batteries into KT controllers. Thanks for mentioning the L1 parameter. Some of my ebikes have the older LCD's without L1. Their autodetect works well enough. Sometimes, when going from 48 to 36. the bar display is stuck low, but that often happens when I power up after a...

I recently bought a used Bafang BPM front motor and decided to use a Brainpower 10A controller on 36V to keep the power down, as it was front drive. Wow, was it gutless. I switched in a KT 10A square wave controller that had 20A peak, and the kick when applying throttle was back. So you...

I've always done it by feel with a 17mm or 18 mm wrench about 10 inch long. The other day I found my 3/8" clicker torque wrench, so I decided to torque the nuts on a 500W Bafang in a steel fork. What's a good number for a 500W motor? I'm using 40nm here. Seems kind of high. My other bikes...

Wouldn't be much of a password if everyone bike used the same one. Name the bike/model, start a new thread, and maybe someone with the same gear knows the answer.

I don't know about weight. A motor weighs the same as it does on a storebought ebike as the converted ebike. However, I agree it's impossible to hide a battery like Fiido and Qualisports do with their seatpost batteries. As far as cost, I have to pay the markup on the motor and the donor...