I have a 99 sportsman 500. I rebuilt the carb and it runs like a dream but starting is really tough. If I've ran it that day it's fine but after sitting for a week it's a bear to get firing. I recently discovered that if I put a rag over the carb intake that I can get it to start. I know the choke is working since I can get it to change rpm when toggle the flip switch but it doesn't seem like enough choke. Do I need to turn the choke cable out on the carb? Maybe adjust idle mix screw? What are your thoughts?