Mysterious "t-piece" between carbs on '81 CB750K...
Posted by PunkAndRun on Jan 26, 2012; 8:21pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Mysterious-t-piece-between-carbs-on-81-CB750K-tp3691494.html
I recently acquired a 1981 CB750K with 1900 miles on it and had very little trouble getting her up and running. Now I'm having an issue getting it to idle happily so I've begun the task of tracking down vacuum leaks. I have found a tee between carbs 2 and 3 and can't seem to find an answer about what it's supposed to connect to...the Haynes manual I've got calls it simply "t-piece" with no diagram or description of what/where it connects to. The diagram I have also describes the hose connected to this "t-piece" as "fuel hose"... again with no description or diagram to explain where it's supposed to end up.
I've read quite a few threads on a few sites and have found several answers:
1) It connects to nothing and is simply a vent...I find this unlikely as it has a slight vacuum to it and drawing unfiltered air into a carburetor can't be the right answer.
2) It connects to the fuel diaphragm unit...this option also seems unlikely as the only hose off of the diaphragm unit not connected to anything is labeled "air purge" or something like that and this doesn't match the "fuel hose" designation of the other diagram.
3) It connects to the air box...this seems the likeliest solution but I can't find any ports or hoses on the air box that it might connect to.
Any help would be greatly appreciated, I've been scratching my head over this for quite a while now. Also, here's two photos of the tee I'm talking about.
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Mysterious-t-piece-between-carbs-on-81-CB750K-tp3691494.html
I recently acquired a 1981 CB750K with 1900 miles on it and had very little trouble getting her up and running. Now I'm having an issue getting it to idle happily so I've begun the task of tracking down vacuum leaks. I have found a tee between carbs 2 and 3 and can't seem to find an answer about what it's supposed to connect to...the Haynes manual I've got calls it simply "t-piece" with no diagram or description of what/where it connects to. The diagram I have also describes the hose connected to this "t-piece" as "fuel hose"... again with no description or diagram to explain where it's supposed to end up.
I've read quite a few threads on a few sites and have found several answers:
1) It connects to nothing and is simply a vent...I find this unlikely as it has a slight vacuum to it and drawing unfiltered air into a carburetor can't be the right answer.
2) It connects to the fuel diaphragm unit...this option also seems unlikely as the only hose off of the diaphragm unit not connected to anything is labeled "air purge" or something like that and this doesn't match the "fuel hose" designation of the other diagram.
3) It connects to the air box...this seems the likeliest solution but I can't find any ports or hoses on the air box that it might connect to.
Any help would be greatly appreciated, I've been scratching my head over this for quite a while now. Also, here's two photos of the tee I'm talking about.
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