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Hitachi jets VS Mikuni jets

Discussion in 'XJ Technical Chat' started by xj750y, Aug 16, 2019.

  1. xj750y

    xj750y Member

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    Hi,

    Will Mikuni jets fit my Hitachi carbs ?

    And if, does someone have a cross reference table with sizes ?

    I have hitachi carbs which I want to tune but I only have Mikuni jets.

    Thanks
     
    xj750y, Aug 16, 2019
    #1
  2. xj750y

    xj750y Member

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    I mean both the slow jet and main jet, thanks
     
    xj750y, Aug 16, 2019
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  3. XJ550H

    XJ550H Well-Known Member Premium Member

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    hatachi jets are measured in mm. Mikuni jets are measured in flow rate.

    mikuni pilot jet is a totally different style compared to hatachi pilot jet.

    why not purchase the correct jet to start with?
     
    XJ550H, Aug 16, 2019
    #3
    Jetfixer and k-moe like this.
  4. xj750y

    xj750y Member

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    Ok thanks
     
    xj750y, Aug 17, 2019
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  5. Jetfixer

    Jetfixer Well-Known Member

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    Jets R Us has the jets , as well as xj4ever
     
    Jetfixer, Aug 19, 2019
    #5
  6. Andyam5

    Andyam5 Member

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    So is a 40 Hitachi jet = 0.4mm ?
     
    Andyam5, Apr 6, 2020
    #6
  7. XJ550H

    XJ550H Well-Known Member Premium Member

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    someone posted a chart a few years ago.

    that is correct

    by the chart 80 jet is 0.8mm
     
    Last edited: Apr 8, 2020
    XJ550H, Apr 8, 2020
    #7
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  8. XJ550H

    XJ550H Well-Known Member Premium Member

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    XJ550H, Apr 8, 2020
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    Andyam5 likes this.
  9. chacal

    chacal Moderator Moderator Supporting Vendor Premium Member

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    Hitachi FUEL jets are stamped with the mm size (i.e. a #120 jet = 1.20mm diameter, and #36.5 = 0.365mm diameter, etc.),

    Hitachi AIR jets are stamped with numbers that have no such corresponding relation to their actual physical inlet size. It is probably an air volume flow "size".

    Mikuni FUEL jet numbers are a measurement of the volume (cc’s of gasoline) that will flow thru the jet when poured in from a height of 50cm.

    Mikuni AIR jets are stamped with numbers that have no such corresponding relation to their actual physical inlet size. Just like Hitachi jets, It is probably an air volume flow "size".
     
    chacal, Apr 8, 2020
    #9
    Andyam5 and XJ550H like this.
  10. Andyam5

    Andyam5 Member

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    Thank you both for the info
     
    Andyam5, Apr 10, 2020
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