My friends Sparkbike is acting up. When the bike is turned on you can push the throttle and it will spin up for a couple seconds and then nothing. No reaction throttle or pedal input. Turn the bike off and back on and again it will spin up for a couple seconds. Battery is almost fully charged, all connections seem to be good. (wherever i found a connector i took it apart to check for corrosion or bent pins or something) I disconnected the connections at the brakes to see if it would make a difference but it did not.