I got the butterfly to operate as it should then put the carb on and set the choke to specs. Engine started on first pull in choke and ran for a minute but when I put lever in run engine would run with surging fast then slow. When back in choke engine running without surge I did not try to remove the nozzle but that is the only thing that I can try to do now. I see on the Sears parts list that the nozzle is repaceable. Does it press out or screw out. I see nothing in the SM about this.