Author How much fork oil?  (Read 11022 times)

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  • Offline beemerdon

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    Offline beemerdon

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    How much fork oil?
    on: 23 January, 2015, 09:22:50 pm
    23 January, 2015, 09:22:50 pm
    I am getting ready to service the forks with new springs and seals. How much 5wt. fork oil should I have on hand to fill both forks? Thanks.

    Don
    When you look back on your life do you want to say, "Wish I had" or "Glad I did!"?

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    Re: How much fork oil?
    Reply #1 on: 24 January, 2015, 12:30:01 pm
    24 January, 2015, 12:30:01 pm
    Don,

    Have 2 qts on hand. Pour @ 1/2 qt in and pump the air out by working the damper rod up and down to get the air out. Collapse the tube all the way and set the oil level to 120mm from the top without the spring and spacer tube.

    Both legs combined will take a little more than 1 Qt total, so start with 2.
    2016 Stelvio, 2015 Norge, 2008 Breva1200 Sport, 2017 Griso, 2012 Norge. Self employed factory trained Triumph and Moto Guzzi specialist. Owner, Hamlin Cycles, LLC a Moto Guzzi/Aprilia dealer.

  • Offline beemerdon

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    Offline beemerdon

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    Re: How much fork oil?
    Reply #2 on: 24 January, 2015, 02:01:19 pm
    24 January, 2015, 02:01:19 pm
    Thanks, Hamlin!

    Don
    When you look back on your life do you want to say, "Wish I had" or "Glad I did!"?

  • Offline Dave73

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    Re: How much fork oil?
    Reply #3 on: 24 January, 2015, 03:42:06 pm
    24 January, 2015, 03:42:06 pm
    Do you have stock springs and valving?
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  • Offline beemerdon

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    Offline beemerdon

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    Re: How much fork oil?
    Reply #4 on: 24 January, 2015, 06:53:36 pm
    24 January, 2015, 06:53:36 pm
    Stock valving but I am going with the Race Tech .95 springs and new seals from Pyramid. I weigh about 220# so the springs were not up to snuff but the valving is okay for no faster than I can ride any more.

    Don
    When you look back on your life do you want to say, "Wish I had" or "Glad I did!"?

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    Re: How much fork oil?
    Reply #5 on: 24 January, 2015, 06:58:33 pm
    24 January, 2015, 06:58:33 pm
    Id go with 15wt in the rebound fork and 5wt on the compression fork.   120-110 mm, depending on how you brake and any dive reduction you may want.
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    Re: How much fork oil?
    Reply #6 on: 28 January, 2015, 10:14:30 pm
    28 January, 2015, 10:14:30 pm
    Tell us what did you do with the spacer did you cut it?

  • Offline ColinB

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    Re: How much fork oil?
    Reply #7 on: 30 January, 2015, 11:20:59 pm
    30 January, 2015, 11:20:59 pm
    Forget watt ratings and look at actual viscosity measured in centistokes at a set temperature (40 degrees is normal)

    Watt ratings vary wildly between manufacturers and semi or fully synthetic oils.
    Last Edit: 30 January, 2015, 11:22:36 pm by ColinB

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    Offline Dave73

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    Re: How much fork oil?
    Reply #8 on: 31 January, 2015, 05:10:00 pm
    31 January, 2015, 05:10:00 pm
    Very true, but without a starting point for reference it is all just trial and error anyway.  Just changing oil is a huge compromise, you really have to adjust the valving to really tune anything.

    FWIW I use Torco RSF 5wt in the compression fork, it is one of the lower viscosity 5wt oils and it has very good stability across temperature ranges.
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    Offline beemerdon

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    Re: How much fork oil?
    Reply #9 on: 01 February, 2015, 10:53:08 pm
    01 February, 2015, 10:53:08 pm
    I have the springs and the two bottles of fork oil; I am just waiting for the seals to arrive from Pyramid to start the work. The forks are off and yes, I remembered to loosen the top cap before removing the forks from the crown! The Race Tech springs came with a long piece of aluminum tube and some washers but I am going to cut the internal spacer as directed by Hamlin. Maybe this week.

    Don
    When you look back on your life do you want to say, "Wish I had" or "Glad I did!"?

     



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