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  1. #11
    PWCToday.com Is My Home Away From Home Grumpy Old Guy's Avatar
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    Re: Yamasaki vibration ??

    Rhass builds some nice stuff & I am not knocking his products but urathane motor mounts are a LOT stiffer than rubber & will cause more vibrations.

    Back in the day (early 90s) Triton made urathane motor mounts & I installed a set in my otherwise smooth Seadoo & it had vibrations that would vibrate thru the hull badly.

    IMO the Yamaha twins without the heavy stock exhaust are gonna vibrate & add the skinny azz Kawi drive shaft & you are gonna get that off idle vibration.
    Last edited by Grumpy Old Guy; 04-29-2017 at 12:58 PM.

  2. #12
    PWCToday.com Is My Home Away From Home Rushford_Ripper's Avatar
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    Re: Yamasaki vibration ??

    Guess it makes sense, I was just curious


  3. #13
    PWCToday.com Is My Home Away From Home Bruce in SB's Avatar
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    Re: Yamasaki vibration ??

    Still hard to believe that all the Superjets out there with aftermarket exhausts vibrate like this. My Kawasaki based twins sure don't. Must be a combination of things to make it happen.
    Thanks for all the replys!
    "Thanks" to Chris Newmiller @ Newmiller Machine

  4. #14
    PWCToday Guru dose's Avatar
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    Re: Yamasaki vibration ??

    Im building a yamaha powered X2 for the summer using the RHASS kit. Even if it shakes like my 550/701 it will still be worth it. I love the Yamaha power in kawi hulls
    super couch
    550sx with 701 and big pump
    550 RC-520
    809cc X2

  5. #15
    PWCToday.com Is My Home Away From Home Grumpy Old Guy's Avatar
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    Re: Yamasaki vibration ??

    Quote Originally Posted by Bruce in SB View Post
    Still hard to believe that all the Superjets out there with aftermarket exhausts vibrate like this.
    They dont have Rhass mounts & a skinny like a twig driveshaft.
    Last edited by Grumpy Old Guy; 04-30-2017 at 12:06 AM.

  6. #16
    PWCToday.com Is My Home Away From Home cudaben's Avatar
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    Re: Yamasaki vibration ??

    Rhass has addressed this- he now offers 1/8" and 1/4" shorter SJ mounts. I think its a combintion of stiff mounts, and if you are running the stock SJ height mounts then the angle of the motor and the angle of the driveline being off just a smidge. I have some odd wear on my fancy aluminum DS coupler. This is my theory! I have not manned up to buy a set of OE SJ mounts- and BTW OE Yami couch mounts are slightly taller than SJ mounts so thats out, I did buy a used set of those.

    One thing to watch for is super acceereated prop wear.

    I have gone through a few props with my setup. I rebuilt a pump new bearings and seals, did a stuffer, and new impeller. It clanged around in the housing, just the same as the junk ones I tossed together to get on the water.
    Last edited by cudaben; 04-30-2017 at 10:38 PM.
    "If it ain't broke, fix it till it is".

    "If all else fails, immortality can always be assured by spectacular error"
    - John Kenneth Galbraith

  7. #17
    PWCToday.com Is My Home Away From Home Bruce in SB's Avatar
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    Re: Yamasaki vibration ??

    So SJ OEM mounts will fit in the Rhass conversion kit? I was under impression it used custom height mounts. Humm... thanks
    "Thanks" to Chris Newmiller @ Newmiller Machine

  8. #18
    PWCToday.com Is My Home Away From Home Rushford_Ripper's Avatar
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    Re: Yamasaki vibration ??

    Well I'm going to be running the old style driveline not the sx so I am now curious to see if the vibration is there.


  9. #19
    PWCToday.com Is My Home Away From Home Bruce in SB's Avatar
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    Re: Yamasaki vibration ??

    I am thinking of taking some 550 2 piece mounts and machining some new wedge bases to fit the Yamasaki set-up. There are tons of 550/750 conversions using 550 mounts without the vibrations so why not try it on the the Yamaha?

    Or try and modify a 550 bedplate to fit a Yamaha with a conversion plate?? This must have been tried...
    "Thanks" to Chris Newmiller @ Newmiller Machine

  10. #20
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: Yamasaki vibration ??

    Seems to me the stock Yamaha subshaft, bearing support, and
    the bulkhead would dampen some of the vibration.

    The Kawasaki driveshaft being solid is just going to amplify the
    vibration, and prevent the same dampening the Yamaha coupler
    and sub shaft would provide.
    Horsepower == Speed, RPM != Speed



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