The TTR is a nice beginners bike. the clutch is very forgiving, it runs very mild, and even with a few mods it is still quite tame.
On the one we had we bought brand new, and dumped a bunch of money into making it semi faster, and it was still one of the slowest bikes on the trails. We added pipe, air filter, jetting/minor carb mods, lightened the flywheel,and a few other things Im sure I am forgetting...
Don't get me wrong it was alot of fun, and easy to take care of, but I regretted buying it.