How are these machines in the mud if I were to get one and add some gator tires in the back. How about ITP 589's, or are they too aggressive. Would it be then better then a Honda big red?

 

I cant say first hand how a 250 Fourtrax would do in the mud. I have a 300 fourtrax which seems to be fairly close to what you have. I bought some super swamper vampires for the rear in 97 or so when they first came out. They are GREAT tires. They get good traction in the mud. They're a 25x13x9 I believe. They have an extremely hard compound. At one point in time I had 0 psi in the tire and the side walls didnt even bow out, only reason I noticed was because one tire looked bigger than the other. I've rode my machine quite a bit and they still have great tread left, I'll probably never buy another set of tires for the rear again.

 

i've got an '87 250 fourtrax with 25x12x9 Dirt Devil tires. it does pretty good in the mud. it can go almost everywhere my dad's 400 big bear 4x4 goes. hope this helps.