I would try leaning the HSN about a 1/8 a turn and try starting it. If no go after a few minutes lean it agian 1/8 a turn. Repeat till it starts. I know after I rebuilt my .18 DTX the book says have it at 2-1/2 turns out ..that was way to rich and it would not fire...I leaned it out and it started. Also make sure your idle screw is set to where there is a 1/32 to 1/16 gap opening when looking in the carb with the air filter off. Good luck. Keep us posted.