Still slightly leaking at drain bolt gasket/o-ring. First was at carb bowl gasket. Now after replacing both o-rings, it still leaks at drain bolt o-ring. I think a larger o-ring will solve the leak. Where can I find a "fatter" o-ring for the drain bolt?

 

Hardware stores sell a lot of different sized O-rings. You may be able to get one there.

 

That was my next step after asking here. Hopefully I can find something next time I drive 20 miles to the nearest o-ring store. I live off the beaten path kind of.

 

Don't know what year model you have,but takes metric size o rings.Is it leaking from the drain bolt gasket or possibly from the needle and seat through the over flow? Have you installed a carb kit?http://www.ebay.com/itm/CARB-REBUILD-REPAIR-KIT-POLARIS-SPORTSMAN-500-2003-2004-2005-03-04-05-/230385051279?pt=Motors_ATV_Parts_Accessories&hash=item35a404e68f&vxp=mtr