my old snow blower wont run. I had it running about 3 months ago been sitting inside, now snows about to come and wont start. I posted a couple days ago and they said maybe the main jet is plugged so i disassembled the carb yet again and blew it out with carb cleaner and still nothing worse than before. Now today i went out and messed with it for a little and got it to run for about 30 seconds very rough. and was turning the mixture screw a little bit but no improvements, and i couldn't get it to run like that again. Now i have been screwing the mixture screw in all the way and pulling it a few times then backing it out 1 and 1/4 turn and still no improvements. Now there is a screw in the bowl that goes into what some people described to me as the main jet should i be messing with that screw also? And it there any easier way to start it than pull start since my electric is not working? Right now it is soaking in carb cleaner to see if that helps, but the snow is coming tomorrow and i dont want to shovel 1.5 feet of snow.