the guy i got the bike from has been riding with no mufflers for over a month it seems to be running really rich to. when i rev it theres alot of black smoke. other than that so far it seems to run good but i have never rode a busa before so i am not sure what everything should feel like. what do i need to do about the smoke get mufflers and do a tune up then go from there? it has 17kmiles.