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Carb overflow

Gacataki

CB750 Enthusiast
Messages
36
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7
Points
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Location
South Africa
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.
 
Thanks I'll check. But could that cause fuel to run out the back of the carbs. Surely it would just drain straight through? Thanks for the help.
 
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