Since the last posts I did on this link, I have built almost 15 electric bikes. A lot of KX80,85,100's, a YZ85, and a bunch of full size KTM's, Honda's and Yamaha's. And a couple of those builds started other builders. They have each done more than 5 bikes each, it is an infectious hobby, habit... The KX85-100 makes a really good little pit bike, in small wheel or large wheel. The YZ85 gives you a lot more battery space, I got a 20S10P Molicel battery in mine now. The biggest I could get in the KX is 20S8P. Have you looked at the Admin Jet Armor. The motor gearbox is weak, but the battery is great. I have been eyeing them to put a QS138 70H V3 motor and controller in one. I just dropped off a KX85 in Encinitas a couple of weeks ago, and I am doing a Honda CRF 450 now for my son in law who lives in Vista.