New guy intro and issue with 2005 Scrambler 500 HO

Hi there, I just bought a 2005 Scrambler and finally got it out today. I went for a ride with my son, for about 45 minutes or so, everything ran great… I let the wife take it out about an hour later and got a call from her that the quad had stranded her.

I went and found her, started things up, it ran for about 5 minutes and then backfired a bunch and then died. I let it set for a few, started it up again and the same thing happened.

Doing some reading it sounds like it could be a fouled plug or potentially a dirty fuel valve. I went to try what I thought would be the easiest first, the plug…

Where the hell is it? I can’t find anything on the actual location of the plug. I pulled off the right side panel, still don’t see it. Do I need to take off the top plastics as well? I’d love to find a diagram or anything that shows me where it is.

If you have other suggestions as to what to check I am open. It could be bad gas as well possibly, the guy I bought it from said he hadn’t run it in a couple of years.

Thanks for the help!

Marty