if it will not idle with out the choke that indicates a pugged idle circuit in the carb. usually debris or old gummy fuel in the pilot jet #32, from the unit setting.
for one thats not my carb
That is what came on a 2003 Polaris sportsman 500. i checked on the Polaris Dealer parts fich.
is it a mikuni carb?
try year 2000
for a 2000 sportsman 500 the pilot jet is #26
thats the one so have to yank carb