Today i tried putting those filters on, all curved down with same length tubes, it ran like crap, wouldnt rev above like 5k, when i took them off it still did it so i hit it wide open and it acted as if it were flooded and then took off. So i tried the old t-shirt filters(which i used on my old KZ400 when i was 14) they worked fine on my KZ but on the CB they did the same thing, could it be running really rich and when i try to put any type of filter on it, it because TOO RICH?? I adjusted those air screws, like all the way in and then 1 1/2 turns back out like the manual said.