i have 5 mACHINES. 1 RUNNING. im constantly putting in time. i have a late 70s all sport trike, 2 early model manco offroad go karts,a offroad kart with a polaris 440 fan cooled engine and a small childs 4x4 truck with a 90cc loncin engine. im having carb issues with the 440. the mancos have a...