Check out this guy's page:
http://rickramsey.net/TE610mods.htm
Lots of useful tips there (he no longer owns the bike though)
Some things in there that I did:
1. move the rear brake hose as it was rubbing the swingarm
2. remove the oily breather in the airbox
3. check the clutch cable routing as it could cause fraying
Let's see, what else:
1. Make sure the electrical system is charging the battery when running - if not, look for loose blue wire
2. Be careful with the "nutserts", especially when working w/ airbox as they can spin in the plastic. Avoid threadlock on these
3. My bike was delivered with over 30 psi in both tires
4. Get some other tires on order as the Karoos ain't all that in the dirt IMO and the rear will be gone in 800-1000 miles, depending on street/dirt ratio.
5. You might want to get a second TwinAir filter so you can keep one clean, oiled and ready for a quick swap
6. If you spend more than 1 hour seated, you'll be wishing for a better seat. I chose Renazco, but there are others.
7. Stock headlight is fairly poor for even riding on a well-lit street or mall.
8. Change out the bolts holding the pegs to the frame with grade 10.9 (and you may need to clean up the peg mounts so they fit flush)
9. OK, one more. How could I forget the delicate FI plumbing? I still haven't taken my tank all the way off in 3K miles
10. Take a grinder to that nub or tit or whatever you call it on the sidestand bolt so that the sidestand auto-retract feature is disabled.
My '08 610 was my first Husky. Yeah, it has some quirks and maybe you'll have to work a little harder to track down parts, but there is good support from Uptite and MotoSportz, along with several dealers (Hall's, MotoXotica, and more) that support more than just their locals. I like mine enough that I'm actually considering buying a WR300 (Actually took delivery on that
WR300 on July 16).