nateweisiger02
CB750 Enthusiast
I have a 1978 cb750k. I took the air box off when I first bought the bike, and it ran without it. Not great, but it would run and I could drive it around. Now, I just chopped the muffler off of the exhaust and it will run for about 3-5 seconds then cuts off. When I give it any gas, it immediately puts out and cuts off. I have seen other bikes with the same setup so I didn't think it would be a problem. Does anyone have any idea if I need to mess with the idle or mixture screws? Or what I need to do to get it running and driving again?