turn the idle mixture screws in to where they are lightly seated & count the # of turns to get there so you can easily return them to their original position when done. then take em out & fit one of those thin red straws to the nozzle on a can of starting fluid by enlarging the nozzle slightly as starting fluid cans do not come with those straws. Shoot a healthy 2 or 3 second blast into each hole with the straw then replace the screws & start her up & see what you get.