You can clean the idle jet as it may need it to be done or opt for a size larger IJ . Have the valves ever been adjusted ? Some need it to be done right out of the crate . All 4Ts will need it done at least once normally around the first 2,000 miles . If they get too tight they do not allow enough fuel and air into the cylinder to start or run correctly . Do you give it any throttle to start it ? My 2T I used to have to give it a sip of throttle to start but after I went from a 40 to a 45 IJ it starts with no throttle and idles like a purring cat . In addition to carb spray a stiff solid wire is great to poke through the tiny holes to remove any film or dirt
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