i should start a new post, don,t know how or where to do it, nothing on this site says where to write a new post,so have to follow someone else with a similar problem, this is an update. hi its me again mirage, just installed a brand new 4 stroke huasheng, it will not run no matter what i do, the new standard h/s carb would not work, won,t pull fuel into the engine, so put on a new Nt CARB still will not run. new spark plug, and new cdi with the engine, just re adjusted the tappets, ie valve lashings. found the inlet was 8 thou and th ex. 10 thou. still would not start, will start reluctantly with easy start sprayed in the carb,for a few secs, cleaned and checked the carb and jets, raised the needle one notch, stiil will not suck fuel in. does the main jet need to be bigger? looks the same as the h/s jet. my old engine would always start first time from cold, never needed the choke with the standard h/s carb, thought things would be simple with an NT carb. this is mission impossible trying to get this engine going. all new what more can one do????