1981 cb750 carbs and fuel lines

Posted by Tooler on Apr 04, 2013; 4:17am
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/1981-cb750-carbs-and-fuel-lines-tp4038927.html

I recently purchased a 1981 cb750 carb off eBay. I have a 1980 cb750c. Now the new carb has an external accelerator pump on top of the carb which my old one did not. The fuel line for it is 5/16 and my fuel petcock is 1/4. I'm thinking that the carb perhaps came off a cb750f because of the larger fuel line. I've seen fuel petcocks for sale on a website and they have one for 1980 cb750c and a different one for a 1981 cb750f and cb750k, however it doesn't specify fuel line size. I'd like to just purchase a new petcock if its a different size. Can anybody shed some light on this by chance? Thanks!