Gacataki
CB750 Enthusiast
Hi all, please help. I took delivery today of a 1980 CB750 Custom. The bike looks good, but I have one big problem. I open the fuel valve on the tank and everything is fine. As soon as I start cranking, the fuel literally pours out the back of all four carbs. I managed to remove all the bowls (on the bike), and if I hold all the floats up, I cannot blow into the fuel pipe. I put it all back together and it still does this. But only when I start cranking. The bike stood for 3 months. Please, I will struggle to believe that all 4 needle and seats packed up at exactly the same time.