Hello! I have a 2002 polaris 500 not starting. I thought is was a rejet issue but I have pulled carburetor 3 times and cleaned and still no start. I have power when switch is turned on and spark at the spark plug but it just cranks and doesn't start. Before taking carb apart..the atv would start with pull start but not with key. There is fuel going to carb as well! Any suggestions??