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Re-jetting ‘85 xj750 maxim x

Discussion in 'XJ Modifications' started by Island ride, Jan 18, 2023.

  1. Island ride

    Island ride New Member

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    Hi all,

    my maxim x came with pods (stock airbox removed) but it hasn’t been re-jetted and bogs out.

    does anyone know if the xj700xn and the 750 had the same carbs? Dynajet has a kit for the 700 but not the 750.

    cheers
     
  2. Mezzmo

    Mezzmo Active Member

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  3. Simmy

    Simmy Well-Known Member

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    careful - that kit is for Hitachi carbs on 750 air-cooled bikes.
    I see Sigma do list a kit for the 700-X but nothing for the 750-X

    I think the carbs are the same, in Chacal's information pages he does show the idle jets being different, something you don't get with the aftermarket jet kits anyway.

    Main jets are the same
    #105 is used on:
    1986 all XJ700-X models and all XJ750-X

    Therefore I think you could start with either the Sigma or Dynajet kit for the 700-X.
    In my experience the 750-X will run all the way to redline with pods and no other mods but at 5,000 rpm it bogs terribly as you experienced.
    If Dynajet give you replacement springs that would be the kit to get.
    Sigma recommend clipping 1/2 a coil off the springs until you get a satisfactory response at 5,000 rpm, this will never work as well as softer springs (or an airbox).
     

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