A lot of people have found little pieces of black clogging up their carbs on the Eiger. I hadn't seen a post about it it in a while so maybe it's fixed, or maybe everyone's running the extra filter so no problems.
Try a search on the forum, you may find a specific one. I don't remember off hand what I'm running, just that I got it at the auto parts store.

 

LimpingLizard,

You just use one that would go on a car? Not one of the plastic small ones for snowmobiles? Let me know if that is the case. I can see that as being much better than the small plastic ones.

Matt

 

Not sure what it's for, I just grabbed one that looked like what I wanted.
Here's a couple posts that mention specific ones:

http://forums.atvconnection.co...er%20fuel%20filter%20


http://forums.atvconnection.co...ger%20fuel%20filter%20

 

Lots of mods for the Eiger.

Check out my pictures. I have the fuel filter but have not added it. I did get dirt in the carb but since it was cleaned I have not had any more issues. ( knock on wood)

There are a lot of post about suspension mods that I have not done and there are also details about jetting in many posts if you do a search.