Mikuni Spring Color & Popoff Pop Off Chart

Discussion in 'Tech FAQ' started by Shonuff, Jun 17, 2008.

  1. Shonuff

    Shonuff I've got the glow Site Supporter

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    [​IMG]

    115 gram = gold spring
    95 gram = dull silver spring
    80 gram = black spring
    65 gram = shiny silver spring

    115 - Mikuni Reference Number 730-03030
    95 - Mikuni Reference Number 730-03033
    80 - Mikuni Reference Number 730-03027-T
    65 - Mikuni Reference Number 730-03027

    Huge props to Greenhulk's RX951
  2. DAG

    DAG NO RISK IT, NO BISCUIT

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    spring w/pic thanks to 2lick

    Attached Files:

  3. Shonuff

    Shonuff I've got the glow Site Supporter

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    Awesome. Thanks Grif, thanks 2lick.
  4. Matt_E

    Matt_E steals hub caps from cars Site Supporter

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    Urr....straight from the Mikuni manual?


    *Damn, typing with banjo picks is hard.
  5. #ZERO

    #ZERO The Beach is This Way Site Supporter

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    Good post, this needs to go in the Tech FAQ section.
  6. Matt_E

    Matt_E steals hub caps from cars Site Supporter

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    Indeed, it gets asked way too often.
    I am tired of linking the manual.

    Now I can just link the Tech FAQ.

    :biggrin:
  7. Scorn800

    Scorn800 I'm all about kawasaki's

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    Just a FYI
    I just got the new 115 gram springs & they are a new silver.
    Got the springs from Tim at Novi
  8. michael950

    michael950 for me to POOP on!

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    So, the manual states you want to use the smallest N/S to obtain the desired pop-off. Does that mean if the desired popoff was 32psi, you should use the 1.5 / 65g combo over the 2.0 / 115g combo?
  9. michael950

    michael950 for me to POOP on!

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    One other questions, for what purpose would you use the Viton N/S?
  10. WFO Speedracer

    WFO Speedracer Banned

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    The reason for that is that the smaller needle valves have greater resistance to vibration,which in turn make the carbs easier to tune and stay in tune.
  11. SUPERTUNE

    SUPERTUNE Race Gas Rules

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    I'd call the new 115 gram spring more like chrome color, not near as silver as the dull gray 95 gram spring or real silver 65 gram spring.
  12. michael950

    michael950 for me to POOP on!

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    The reason for what, the smaller n/s (which I assume) or the use of the Viton tip?
  13. Matt_E

    Matt_E steals hub caps from cars Site Supporter

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    The viton tip is on all newer N&S valves.
  14. michael950

    michael950 for me to POOP on!

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    BTW:

    Here is another copy of the chart from the Mikuni Watercraft Carburetor Owner's Manual
    Despite the page count, it is an easy and somewhat quick read.

    You can use this info as a point of reference in the event you do not have a gauge.

    Attached Files:

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