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Thread: Unsprung weight

  1. #11
    YAMAHA POWAAAA !!!!! 1_Fast_SHO's Avatar
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    Quote Originally Posted by 2fast4u View Post
    I think the machine work charges were $75.00 It was done to reduce the rotational weight so the clutch rpms would slow down faster when the clutch sprag un locked from the supercharger this helped things wind down quicker.
    I still have one in one of my skis.


  2. #12

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    Quote Originally Posted by 1_Fast_SHO View Post
    I still have one in one of my skis.
    Good Morning 1_Fast_SHO

    In your opinion, did it make a difference on the life of the clutch? I am thinking no, because a lot of the heavy hitters using superchargers with boosts 24,26 30, psi would be running it and we would know about use of this gear mod. I am just able to do it because I have easy access to a $142,000.00 Haas CNC machine and a machinist. ( my brother )

    Take Care
    C J
    Last edited by cjk6119; 12-25-2019 at 11:29 AM.

  3. #13
    YAMAHA POWAAAA !!!!! 1_Fast_SHO's Avatar
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    Quote Originally Posted by cjk6119 View Post
    Good Morning 1_Fast_SHO

    In your opinion, did it make a difference on the life of the clutch? I am thinking no, because a lot of the heavy hitters using superchargers with boosts 24,26 30, psi would be running them and we would know about use of this gear mod. I am just able to do it because I easy to a Hass CNC machine and a machinist. ( my brother )

    Take Care
    C J
    Some people swear by it, some other people swear by the riva damper, i personally dont know if it made a difference. Ill take pictures tomorrow if you want. I dont ride the ski anymore. It is for sale.

  4. #14

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    Today I went to the machine shop where I will have my idler gear lightened. The other shop was unable to do it because the material that Yamaha uses is harden steel and he did not have a Die Sinker EDM drilling machine.

    So what is a EDM? EDM is a Electrical Discharge Machine that can accurately drills through hardened metal, it removes metal by means of electric spark erosion under blanket of oil. In this process an electric spark is used as the cutting tool to cut (erode) the workpiece to produce the finished part to the desired shape.

    The weight of the gear before the machining is 14 oz or 396 grams. Anybody want to guess what the finished weight will be in grams? The job will be done near the end of January 2020.

    That is the latest update I have.

    Happy New Years to all of you from Sally and I

    Take Care
    C J
    Last edited by cjk6119; 01-11-2020 at 01:31 PM.

  5. #15
    Lake Lion
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    2021? That's a long time to weight

  6. #16

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    lol yea not till next year but I still have to install Dean`s Clutch, will work on it in the am. Take care Hottbutta I like the "weight" time too. That was good.....

    C J
    Last edited by cjk6119; 12-31-2019 at 05:56 PM.

  7. #17
    mjh3ides's Avatar
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    I had this one lightened by R&D years back. It was from a '08 SHO so it's a first gen idler before Yamaha updated the clutch & idler design in 2013. Stock weigh was 458g so it shaved 40g...about 9%. Ran it on a low boost setup(14psi) for about 100 hrs without a clutch failure before I eventually upgraded to the 2013 clutch & idler. I later donated it & my gen 1 clutch to a friend who ran it for many more hours reliably. It's definitely not a cure-all, especially with your 19psi wheel but IMO it helps.

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  8. #18

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    [QUOTE=mjh3ides;3055361]I had this one lightened by R&D years back.

    mjh3ides do you recall what the price was then?

  9. #19
    [QUOTE=cjk6119;3055365]
    Quote Originally Posted by mjh3ides View Post
    I had this one lightened by R&D years back.

    mjh3ides do you recall what the price was then?
    $75

  10. #20

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    My machine shop wants $155.00 to do the job for me.

    C J

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