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  1. #1

    Bad PV Servo or CDI?

    After an exhaustive search through the wealth of information on this site and others, I wanted to try and ask my question directly and see if anyone has some concrete ways of telling whether my problem is the PV servo or CDI.

    Ski is a 2002 GP1200R, plugged pump shoe, d-plate, new Solas concord impeller (not sure of size off hand, recommended by Carl at Island Racing)

    After making a stupid mistake a few weeks ago I have gotten the ski back to running great (almost). I inadvertently pushed water into the cylinders while flushing the motor, with the advise of the fine people on Greenhulk, I and immediately fountained the motor then fogged it, then ran the crap out of it...burned up all the water and motor pulls great..

    On to the PV issue...

    Im pretty sure my PVs are not opening although I haven't had flat enough water to be comfortable riding without the seat, it seems to show all the symptoms. Ski revs to around 6K and goes approximately 59 on the dream-o-meter, fastest speeds come at less than full throttle. When I shut the ski down I do not see the PVs cycle open and closed. I do see them cycle when I unplug and re-plug the servo motor, often when I do this the servo seems to jitter for a few seconds then perform the cleaning the cycle. Ive opened the servo, which must have been replaced by the previous owner since the plug is crimp connected to the servo, it doesnt look great but i cleaned it up with some electronics spray and removed any of the corrosion where the main leads attach to the circuit board. I also removed the corroded crimp connects and soldered the connections using shrink wrap to seal them up.

    Thinking back to the day when I was fountaining the motor, I clearly remember the PVs cycling after each of my cranking attempts to purge the water. Could excess cranking have caused either the CDI or servo to blow? Since both parts are a little pricey, does anyone have any ways of determining which part is the problem? Ive done the PV servo test in the manual and the servo only rotates one direction and seems to be a little hesitant doing that (possibly due to the connections when bridging grey and black wires). Should the servo cycle when performing the test, or is the forward and backward points controlled by the CDI? Is it possible that is the wrong 66V servo (previous owner not exactly the brightest bulb)?

    Any ideas welcome...

    Thanks in advance!


  2. #2
    O.G. (Original Goonie) Bigwilk's Avatar
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    Do you have any friends with a similar ski that you can borrow a pv servo from? Or CDI? That would be a good way to test it out.

  3. #3

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    I was having the same problem. What I did was pull the seat back a little pop the coverof the servo motor and ride you will be able to see the servo open and close if its working properly.

  4. #4
    I agree, but assuming the servo isn't moving... How do I tell if its the servo or CDI?

  5. #5

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    pull servo motor and give it juice from a battey if it turns then it's good, if not then cdi

  6. #6
    powerstroke specialist mikegp's Avatar
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    pm send.

  7. #7
    Moderator OsideBill's Avatar
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    Iti s pretty rare for a CDI to go, much more coomon the servo to go out.

  8. #8
    So when i test using 12v and jumper, should i expect a full cycle (forwards and backwards) or am i expecting it to just turn one way and keep going??

  9. #9
    Moderator OsideBill's Avatar
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    Run + power to red wire pin on the servo motor, and - ground to the black wire pin. Then use a jumper wire from the black pin to the grey wire pin to get it to cycle. only hold the jumper on the pin for a few seconds. it will cycle to the end of travel in one direction, if you jump again it will go the other direction.

  10. #10
    Great! thanks OsideBill! Im pretty sure when i did this previously it just runs and runs without stopping (but i had tried this with the cables disconnected).. I will double check tonight and report back.

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