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my citicar has a curb weight of 1,100 pounds with batteries, it takes a 3.5 hp motor to go 40mph with it, a 1hp motor would be good for a motorcycle.
if you touch a 12V battery to a 48V motor, it should jump or twitch a little if it's good, but really, first thing to go should be the brushes, a rebuild might not be free, but it's cheaper then a brand new motor, call an electric motor repair shop and ask them what they would charge to do an overhaul on a motor from a <brand name and modle> forklift that you are looking to buy, maybe ask them a few more questions as well, like if they have any recomendations on motors to avoid.
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