Things have sure changed since 2008 which was the last post in this topic until the last 2 posts above this one.
The prices are pretty close between a good 4-stroke shifter and a good electric shifter these days, in the $800-$1200 range for parts, and my baseline for what I will personally choice to take for a spin from all my options over any type of 2-stroke, even the kick butt fast ones.
In short I am sick of bump start and manual clutch.
I do like a 4-stroke but you simply can't guess about what the actual real riding experience is on an electric, you have to actually experience it.
The 18ish kid that his mother bought this build for found that out in a hurry.
After repeatedly telling him to 'go easy' on the throttle and don't throttle up until you are like in 2nd or 3rd gear, he left in first and opened the throttle.
That machine gave it all it had and he wheelied back on his butt on the road instantly.
Again, you just can't appreciate how an electric motor is different than a gas engine until you ride one.
1,860W BLDC motor with planetary reduction and 54V 960W 20AH LI Battery.
It was the last of the ones I ordered when I was doing electric shifting trikes.
I used a sickbikes HD freewheel crank system to tie the freewheel electric motor to the 7-speed derailleur on that absurdly light bike.
The result was nothing short of a kick-butt responsive well balanced machine regardless of how plain it looks.