I have a 88 honda fourtrax that just started giving me troubles. It starts great, idles fine but just starts to sputter really bad above idle like its missing then the black smoke starts like its to fat. I have bebuilt the carb by cleaning all the ports, installed a new vacuum pod, checked the vents and cleaned and re oiled the filter.
After all the work, same results. I then tried removing the filter and when I place my hand over the intake "loosely" and restrict most of the air. It runs fine and revs up great. This is the reason I replaced all the orings and vacuum pod in it thinking it had a leak and wouldnt allow the slider to open. If I create enough restriction the carb has enough vacuum from the engine to open the slider, any ides? Thanks