I got a stick jabbed between the wheel and tire after the last ride, and it went flat. I pulled it out best I could, but it would still go flat every couple of days. I sprayed it with some soapy water, and it was on the bead like yours. I was just going to do what everyone above did and take it to a local shop. I needed to slime my tires anyway, and figured what the hell. Put the amount it said in all tires, and there was still a little left over, so I put that in the tire leaking. It's held air fine now for 3 weeks so far, so the slime seemed to fix it.
2005 Polaris Sportsman 400 4x4
3 Headlight Mod / 14" ITP SS312 / 26" Maxxis Zilla's / Under Body LED Accent Lights