I just reshimed my valve and it wouldn't crank I found out that I had it timed wrong. And before I knew that I messed with my carb and the fuel screw. It is poping when the joke is not on but if I use the choke it runs normal. I don't know I didn't set my fuel screw like I should have or not I live in Louisiana and its about 100 degrees right now. Another thing is my hot stry doesn't work and won't unhook from the carb. Any ideas??