Ok, first, check all hoses from your air box, make sure there secure and air tight. Second, are the jets, especially the idle jet, clear?, it happens, why? I don't know, it happended to me. Your mixture screw is sealed on an eiger, if not, a problem, check it 2 1/4 turns out from soft bottom( which means turn it clockwise until it seats,not too much just until you feel resistance, then turn counterclockwise 2 1/4 turns, depending on altitude, this will give you a starting point) if still capped of, leave it alone, not your problem. Now, competely replace all fuel in the system, with good unleaded fuel fresh from the gas station, in a clean or new gas can, no exeptions! If still no result, check valve timing and valve clearance, very important, people overlook the obvious. Next step is the choke cable, fuel filter, and vent lines. I know this sound like alot but it's not. Buy a service manual! Start with these and let me know where you are. Compression could be it, it was with mine, but it still ran. You have to eleminate the other options that I listed. Check compression, if bad, well get ready to replace the top end, do it yourself if able, around $800 if done properley, NO SHORTCUTS!!! You've got a great bike that will last for a long time, don't short change yourself with shortcut!!!!