I have a 1997 Banshee with; wiseco's pistons toomey t5 pipes, k&n filter, boost bottle, bore .20 over. It ran fine till I got the pistons in. I got clamp on filters and a new jet kit and tryed to jet it right and couldn't get it. So I went back to the air box on and the same jets and way I had it when it ran great before. I have a 280 main 25 pilot with my air box lid on it runs great all the way to 3/4 throttle and then like crap. If I take the lid off the air box it will run great top end but want to keep going when I let off the gas. I tried moving the clips on the needle and nothing different. Is this the jets or an ignition problem. Please help me I am desperate. thanks