not very hard at all matt, ya i have all the new and old quads and bikes below and am jetting my eiger, im getting a 400ex in a month or so but im just out of money to buy a brand new one...also i save HUGE amounts of money buy buying used equipment and fixing them up,(my high school classes are in mechanices), just some advice

 

Check this: http://www.powroll.com/P_HONDA_TRX250EX.htm
only 330 $ but you need the exhaust so it may be over your budget

For the exhaust you'll need to rejet but its ezee and you should have the needles and jets specs with the pipe...

Yeah on a tight budget the best is to buy used, you can get great deals even when its in mint condition.. check on ebay for your slip-on.