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Thread: Lefty Fork Oil

  1. #1
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    Lefty Fork Oil

    Ok so I need to do a quad seal replacement and thought I would change the oil to.. in the manual it says the fork needs

    Golden Spectro
    Fork Oil Motorcycle Cartridge
    Fork Fluid, 85/150

    Not beeing overly technical re forks that means nothing to me. Im just used to the usual gradings like 5wt 10 wt etc.. what does the above mean?

    What are the rest of you running

    Cheers for any help

  2. #2
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    I believe the standard oil is 2.5wt. I run 5wt Motul motorcycle fork oil, which is excellent.

  3. #3
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    Magic.. any ideas what all these figures mean!

  4. #4
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    Ok. It's a way to express viscosity. Golden spectro oil is labeled on the Saybolt Universal Second / Viscosity Index, instead of the SAE weight system. Have a search on Google if you want to know more about this. Spectro's 85/150 oil corresponds (more or less) with 2.5wt.

  5. #5
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    Finding motorcycle fork oil in stock in anything under 10 weight
    is not that easy .
    Non of my local shops had any

  6. #6
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    THe Spectro oil is a SAE 85 HVI 150 (high Viscosity Index)
    in SAE terms, 85 corresponds to 5W motor oil (85 is gearbox oil nomenclature)


    i use the Spectro 5W HVI 150. This oil provides excellent damping characteristics.

    Not all oils in 5W range will have the same ISO viscosity. I have a chart somewhere that can help you with ISO viscosity which is whatyou need to tune the fork properly. DO NOT BUY OIL ACCORDING TO SAE VISCOSITY IF YOU WISH TO HAVE CONSISTENT DAMPING FROM OIL CHANGE TO OIL CHANGE.

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