Question about 1998 Honda CB 1300 Super Four

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My Honda X4 idled lumpy and on inspection of carbs has different sized main jets. The two sizes of jet are 108's and 115's. What should the standard jet sizes be?

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108s and 115s are the stock sizes. The 115s are on the outside cylinders

Posted on Jun 08, 2011

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  • hwheeler3 Jun 08, 2011

    If you want more info just ask. I have done quite a bit of tuning on my X4.

  • Hesham Talaat Hegazy
    Hesham Talaat Hegazy Oct 17, 2011

    Are you sure about that the 115 should be on the outside cylinders ? The workshop guy told me otherwise , that they should be on the inside while the 108 on the out side , Actually I experienced some sever engine hesitation after 190 km/h ( I've installed a speed limiter cutter that stops the signal sent from the speedometer I got from POSH Japan ).
    Anyway , After reversing the jets ,the hesitation stops but no pulling after 200 Km/h , I'm thinking of increasing the jet sizes to overcome this problem .
    The problem with the Honda X4 its a very rear bike and almost no info about them .

  • areena
    areena Feb 20, 2015

    1:3 115 AND 2-4 118.crazy but thats what japanese service manual gives



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