It's my buddies bike we have been working on. It's a '94 Katana GSXF 600. He took the airbox off because it was off when he bought it. It's burning gas like crazy and bogging down after riding for a little bit. I took it for a spin the other day and when I was going to enter the highway, I gave it the throttle and it wanted to stall, but I was able to pull over before getting crushed. So I pulled back into the school and it was doing it still. I know he took the airbox off because it was pinching the gas hoses, and the filter maybe clogged. I know a little, but not enough of motors to know if it is fuel jets, or too much air in the carbs from being open. Any help would be great.