ok at first i thought was a carb problem but i built it and still wont idle. then i put a spark tester on it and i have no spark unless i hit the throttle...there is a plug comming off my throttle if i un plug it the motor will rev up on it on. i dont understand what the plug in is so im having problems diaging the problem..i know its an electrical problem as soon as i let off the throttle it stops firing