At the beginning of this riding season the front tires on my 86 Bayou had roughly the same amount of tread. Now, roughly 4 months later, the right tire is bald while the left one has hardly worn at all. I keep them both at around 4 psi and check them regularly. It doesn't make any sense to me since it's the left tire that runs on the pavement the odd times I have to drive along the edge of the road to get to another trail and I'd expect that one to wear more than the one that spends 99% of it's time in the dirt.
I'm getting ready to replace them and I'd like to correct the problem so I don't ruin the new ones just as quickly. It has swamplites on it right now. Are they known for wearing out really fast? I'll be replacing them with a pair of mudlites.

 

Is it a full time 4x4? If so only one tire gets drive power on a limited slip front end at a time. In you case the right is your power wheel most of the time by the sound of things.
In General the tire with the least traction gets the power. The power changes back and forth during turns. If your driving straight one tire has to get the power and your prefers the right I would guess.
If your atv is 2wd then the only thing I can think of is you may need a front wheel alignment or one wheel bearing is getting bad and causing a slight wobble.

 

Ooops sorry, I just noticed you did mention it was 2wd. Check your wheel alignment for toe in or toe out.

Also check wheel bearings and A-arm and tie rod ball joints have no slop or play.

 

There is a bit of play in one of the bushings. I'll try to get everything tightened up before I change the tires.
Here's what they looked like on May 3rd.


This is from yesterday.


The wear really started getting bad in the last month since my brother has been using it a lot. Coincidentally, his tires are wearing the exact same way. Could it be the way it's being driven somehow?

 

Hard to tell from the pic but the worn wheel looks toed outwards . That sure is uneven wear.

 

I am inclined to think your hub is shot. Jack up that sside and shake the wheel up and down. The lightly wiggle it front to back. You will see where the slop is. Then you will have a starting point

 

I just checked the toe in (compared to the rear wheels with a long straightedge) and it's actually toed in about 1/2". The right one is only toed in 1/8". I read there should be 1/8-1/4" toe in altogether so I'll try to fix it when I get back (and probably double check it with the long string method I read about).