I just purchased my Polaris Sportsman 500; brought it home and the next day the tire was flat. I put air back in it and next day it was flat again. I don't see any holes or hear any air coming out.
Can I take it to a tire store and see if they can try and fix it. Also when putting the tire on what does the lugs needed to be torque too.

 

If it's a 2 piece flange nut (Washer and lug nut together) my 2006 manual says 27 ft. lbs. If it's a single lug nut, 90 ft. lbs.

The thing to try is take the tire off, inflate to the maximum psi as listed on the tire, and run it through a tub with soapy water in it. Use dish soap. The leak should show itself with a steady stream of bubbles being formed. If it's around the bead of the tire try whacking the tire with a small sledge hammer to reseat the bead. If that doesn't work bring it to a tire shop and have them remount it with glue on the beads. If it's a hole use a plug kit. If it's in the sidewall it's better to put a patch on the inside but many of us have put plugs in sidewalls of ATV tires without any problem.

 

Try replacing the valve stem core(or make sure it's not loose) and make sure to have a cap. If that doesn't do the trick it's probably a bead leak and MooseHenden has the right idea of checking for that or a hole somewhere. I bought a can of bead sealer from Napa and always use it when I replace tires. Did you get this new (said you just purchased it)? If so, bring it back to the dealer and let them deal with it for free.

 

You could put some Slime in it. Kind of messy stuff. Lots of people around this area use it because of the Cactus needles.

Fred