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No fuel?? 82 maxim dohc 400

Discussion in 'The Garage' started by krazyt, Jul 23, 2012.

  1. krazyt

    krazyt XS400 Member

    Carbs have been cleaned very well by myself, it will start with starting fluid. It will also start and stay running when I blow the fuel into the carbs. I am assuming the vacuum assist from the petcock is not allowing gas to be pushed into the carbs? Any ideas? Do I just need a petcock rebuild? Thanks!! :wtf:
     
  2. drewpy

    drewpy Excess twin Top Contributor

    check the vacuum hose to the petcock isn't split
     
  3. krazyt

    krazyt XS400 Member

    I did replace that already. I also tried going off the other carb intak boot without any luck
     
  4. jmd_forest

    jmd_forest Bldg 1980 XS400 Cafe Bike

    Turn the petcock to PRI to bypass the vacuum control. Pull the fuel line from the carb and verify fuel is flowing. Also, the float levels may be set wrong and not allowing the fuel to enter the float bowls or the floats may be "stuck" shut.
     
  5. HoughMade

    HoughMade XS400 Guru Top Contributor

    The vacuum petcock does not "suck" fuel in or blow it in. The vacuum simply opens a valve and the fuel flows by gravity.
     
  6. domains

    domains Banned

    The xs400 petcock was invented by a dick. bypass it on reserve and plug tube if you really want to have fun.

    maybe it works tho.

    and that Chinese labling whois the nut that thought of that and no arrow on younger models

    place tank line in a cup and start bike to see if its flowing... be carfull :)
     
  7. fusion1962

    fusion1962 XS400 Member

    23
    4
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    If bike starts with starting fluid and you know fuel is flowing to the carbs, your carbs are the problem. Ultrasonic clean them with carbs split and totally disassembled. Replace internals with good rebuild kit. You will be glad you did.
     

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