I have a 08 sportsman 400 ran fine trail riding yesterday washed it and know it onlyruns on choke take choke off it quits cheched air box no water matbe moister in the tank.
runing only with choke usually means it starving for fuel. pull the carb and clean. make sure the pilot jet is clean sounds like its pluged. I thinks it just bad timing it happened after you washed it.
you can probaly take the fuel line off the carb and just let it drain. if its a rubber hose pinch it off befor you take it off the carb to save it from spaying everywhere. or if you like the taste of gas you can always sifon it out. also drain the fuel bowl while your at it on the bottom of the carb theres a screw on the bowl lossen it and catch the fuel that comes out in a clean container and you will be able to see if it has water in it.
So worked on the polaris today drained tank removed carb and cleaned out found some nasty ch!t in the carb and lines cleaned out fuel lines found the same stuff in my honda three wheeler so i cleaned the other 2 machines but ready for hunting know.
yep they ran but thats twice bad fuel from entwhistle and from evensburg with the polaris if theres going to be a problem that machine will find it.thanks for all the advise and help.