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Thread: PV question...

  1. #1
    xyzyx00's Avatar
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    PV question...

    i decided to take all 3 powervalve assemblys out of their cylinders today for a good cleaning and noticed that the sleeve the vavle rides in has stops torwards the bottom so the valve cant actually fall into the cylinder- even if some if its linkage and/or pins were to break or come apart. am i missing something here? The thing is that i cant understand the horror stories about valves dropping into cylinders or being nicked by pistons?


  2. #2

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    I was going to ask the same question as recently noticed the same thing. Is the PV slot different on older models so the PVs would hit the pistons?

  3. #3
    xyzyx00's Avatar
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    kevski- i have #12 cylinders, what are yours?

  4. #4

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    My ski is a 2004, which was the last of the PV engines, where the slot for the PV doesn't allow it to go close enough to the piston to catch/cause an issue. I've not seen a 2000 1200 cylinder to see if this is different.

  5. #5
    xyzyx00's Avatar
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    mines an 02

  6. #6
    Moderator RX951's Avatar
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    For the powervalve motors (66V), the waveeater clips must be installed. They are designed as an added measure of security when retaining the OEM Powervalves in Yamaha engines. A Special Fitted clip prevents pin for moving and valve from dropping to low into valve guide. Special couplers better synchronize valve actuation through tighter tolerances and improved design.


    http://waveeaterproducts.com/






    Quote from Waveeater products:

    First of all there was no solid stop to keep the valve from dropping into the piston. This problem is more common than people think. The only way to tell if this has happened is to remove the covers and measure how far the valve drops down when fully closed. To measure place a straight edge across the cover surface and measure down to the top of the stem. If this measurement is over .43" (11mm) then the stops have worn and allowed the valve to rub the piston.
    You can still install my clips to keep further damage from happening but realize that for every fraction of an inch you measure over .43" means that the bottom of the valve has been eaten by the piston that amount.
    Second, as with all versions of valve, the pin slides out. The sides on my clips retain the pin in place.
    Up until I designed these clips there was no option except to replace all the -02 valves. Although other manufactures that make the aftermarket arms that hold the pins they don't incorporate a down stop needed for these valves.

    The next version, ( -03) solved the problem of the valve dropping down to low but still suffered from the big problem of the pin sliding out. The WaveEater clips work on these valves also to keep the pins in place.


    source:
    http://waveeaterproducts.com/

  7. #7
    Like a chimp with a ball-peen hammer smackwave's Avatar
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    My 2000 has the collar and stops that were meant to keep the valve in place. Unfortunately the stops were easliy worn down or even broken off (I experienced both) on the earlier models. Additionally, the shaft could break, completely dropping the valve onto the piston.

  8. #8
    qbzonk's Avatar
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    Yup, I have the clips on my ski.

    Cheap insurance on the 66V engine.

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