I am not directly building carts. But I have two trike style chinese motorcycles that are using the same tech. One is a Ruckus style trike with a 184(200)cc Brute gy6 cart engine and the other is an electric powered tuk tuk truk with a 60v system and 1800w motor. I have several motors lying around and was thinking of good uses for them too. Hope to learn from you all.
