I just picked this bike up from my nephew, it had been sitting for awhile but supposedly ran about a month ago. I drained the gas and put fresh gas in and the bike fired after a lot of kicks. It did not run well, would not idle correctly so i removed the carb to make sure everything was cleaned and no jets where plugged. reassembled the carb, put it back in the bike and now it wont start. I put a new plug in it thinking maybe that was it but nothing. So the bike went from running like crap to not running at all. I dont understand what the problem is?