I've got a gt-5 kit 66cc. The plug it came with is a LD Z8C and the diameter of the male end is too large to fit into the female plug cap. The cap just sits on top the plug and I'm relying on the rubber booty to hold the thing in place. It works ok but it don't look right. Do I need a different plug wire cap or a different plug or what. Any ideas would be much appriciated.