I'm looking to get a more comfortable seat and raise the bars an inch or two. Any suggestions on where to get a good seat cover or replacement seat?

 

Seats, I cant think of any manufacturer of aftermarket seats at the moment, but as for raising the bars, you can either get new bars with a diffferent bend, or you can get a new steering stem, +1 or +1.5 inches (I dont know if they make +2).

Btw, you kinda confused me for a sec, YZ(450)F is the dirtbike, YFZ is the quad.

 

There is a couple companies that sell more padding for the stock seat but I don't know the names. You can check out the new '05 seats to see if you like them better, they made them more comfortable this year.

As for bars, check out the Answer Pro Tapers ATV bend! If you don't like that try the Tag T2's!