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  1. #1
    CB750 Member fivestring's Avatar
    Join Date
    Nov 2012
    South Georgia

    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

    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)
    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 cyclebuster's Avatar
    Join Date
    Oct 2012
    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 750Ksabin's Avatar
    Join Date
    Mar 2013
    4306 240th Ave. Buffalo Center Ia. 50424
    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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