You can fix it yourself or bring it up to a tire shop, they can take care of it. Always carry a plug kit in your tool kit, cheap insurance. A few things I also carry in the kit, a little foot pump that’s made for a bike, valve stems, cores and the tool that removes them. I also carry a small can of ether/lighter. I’ve been on a few trips where someone broke a bead or valve stem, the ether comes in handy. Other things I carry, spare belt and the tools to change it, spark plugs and a small tube of grease. The grease is used to set the bead. I know the above is more than “a tire leak” but, they come in handy when your broke down.
To find your tire leak…grab a spray bottle add a drop or two of dish soap and fill with water, shake it up good. Over inflate the tire a little. Remove your tire lay it flat, spray the entire bead. The leak will bubble, easily noticed. Spray the valve stem, both the base and the core. Flip it and spray the other bead. You can take care of bead leaks by over inflating a little but more often than not there is dirt, a rock or a stick jammed in it. They need to be removed, bead broke/cleaned, bead sealant and reset. A tire shop is your best bet if you havn’t done or know how to do the ether method.
If you don’t have any leaks in the bead or stem it’s in your tread. Roll the tire and spray the entire surface, watch for bubbles, find the leak, ream the hole and shove a plug in.
Speaking of ATV’s, going on a ride with about 20 guys next weekend! All the above tools and more will be in my tool kit/saddle bags.
BIRDDOG