Just picked up a 2001 RC51 and the kickstand sensor was disconnected. I can't seem to find out where it gets plugged into. I must be overlooking it, but have no idea where to plug in. Will that also prevent the bike from starting?
It should be exactly where Wibbly's diagram is pointing (top arrow pointing down). Mine was tucked in behind the frame and shielded by a clear rubber boot. Should have two wires and the connector is green I believe. If it was disconnected properly and the bike runs when in gear, there will be a jumper wire in the connector to allow the bike to run in gear. Hope that helps.