I was mainly bemoaning that they do not have a kit, which means figuring out what I want for every piece
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You are making a battery harness w/ 10 Ga. wire and XT60 connectors and you are worried about connecting a few components?
Most kits require some finiggling. Actualy, what BMS Battery calls a "kit" is just the motor and wheel
Tell you what, something just came to mind, search for the MXUS "waterproof" front mini geared kit. The entire thing uses multi-pin push/pull connectors and the motor is sm. enough to be frt. mounted since you seem to be stuck on this idea..
A couple builds have been doc'ed here, one recently was purchased on Aliexpress and the other, a year or two back was obtained from the MXUS factory.
I plan on putting the controller oin the battery bag anyway with quick-connects and it is not like I need to buy a lot of additional items for the kickbike. LCD, throttle alone would handle it as no PAS is required.
I have no idea what you are refering to as "Quick connectors", are you going to include the one or two dozen wires from the controller? The controllers I use(That come w/ the PAS, throttle, display, etc.) are $30 to $40 shipped, why would go to all that trouble for such an inexpensive thing?
Overall, it's a bad idea.
I think it would be best to stick with right-hand throttle as that more closely matches the motorcycles I am familiar with. Muscle memory can be a major pain in panic situations!
Common noobie misconception.
I was a motorcycle tech. for over 30 years and it took me about a minute to get used to a left hand throttle, it's totally intuitive. The reason one goes with the left-hand throttle is the frt. chain ring is not used w/ a motor and the shifter can be removed to free up throttle space. If you put it on the right, you are going to relocate the shifter that does get used. As to how much, well, that's the other major misconception that folks that have never ridden an ebike have. That they will be shifting a lot. The reality is, with a motor of any power of all, only 2 or 3 gears get used.
Good luck.