Have you tried setting it to the factory settings? Both the LSN and HSN are 3 full turns out from all the way in. Also whats the gap look like in the slide carb when you dont touch the gas? Maybe its too small. Ive noticed that its kinda hard to get these things to start when its cold. I would try holding the throttle down just a touch when you go to start it. Other then that im not too sure. Maybe the carb is clogged, or the gas tank isnt properly pressurized. I would suggest other things but im still learning when it comes to these things. LOL.