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  1. #1
    CB750 Member
    Join Date
    Nov 2012
    Location
    South Georgia
    Posts
    25

    What is the hose connection up under the tank for?

    CB750K8, it came without airbox. When I turned the gas tank over I found the petcock fuel line nipple was broken off. I found a $20 replacement at CB750.com.

    But there is another hose connection up under the center of the tank, I am assuming it is a vent and went to the stock airbox but I want to be sure. And since I have no airbox, what should I do? Run a short hose off it with a breather? Block it off? Or just let it open?

    There is also the hose connection coming off the valve cover I need to address. Any suggestions on what to do with that one as well? Maybe I should just route the crankcase gasses back up to the tank?
    Current:1978 Honda CB750K, 1978 KZ1000A2A stretched 4" bobbed and hardtailed, 1981 & 1983 Yamaha xs650's (future bobs)
    Former:
    1980 Kawasaki CSR750, 1980 Suzuki GS850L, 1982 Suzuki GS1100K, 1987 Suzuki GSXR1100, 1985 Suzuki GV1200 Madura, 1981 Yamaha 650 Midnight Maxim, 1972 Suzuki GT380, 1972 Yamaha RD350

  2. #2
    CB750 Addict
    Join Date
    Oct 2012
    Location
    mi
    Posts
    293
    there is a large hose off the valve cover that went to the atmosphere behind the engine. in 77 i think they added an evaporative canister on it, but you can just run it open behind the engine. the hose from the tank can just be run behind the engine, i have a couple that are just clipped off around the breather area.

  3. #3
    CB750 New Member
    Join Date
    Mar 2013
    Location
    4306 240th Ave. Buffalo Center Ia. 50424
    Posts
    4
    If your tank has a flip open lid over the gas cap then the hose conection under the tank in the middle is a drain for spillage whe gas is put in. It needs a hose going from there to behind the engine and draining to the ground.

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