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  1. #1
    paul c's Avatar
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    gp1200r power valves "jumping" some

    i did a search and didn't find anything on this and i am not sure of a good one word description for it. after my ski is turned off and the valves do their self check/clean the servo motor will make i high pitched noise and it will short cycle. the motor will turn back and forth but only moving about 2 mm in each direction. i tried another motor (used) and the same thing happens. i verified that they work with the seat off and a white zip tie around a coupler. i did at one point hook up a protec p.v. controller (used) and then the valves didn't work at all. i know i had it hooked up correctly, don't know if that damaged the cdi. any info will help sisnce i am trying to tune my rebuilt crabs and there is a hesitation around 5000 rpm's. want to make sure i am chasing the correct thing.


  2. #2
    WATER WOODY's Avatar
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    Stock ski? Aftermarket tach? What rpm at WOT?

  3. #3
    paul c's Avatar
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    ski has some mods but none with the electrical. no aftermarket tach yet, was planning to put one in. it has stock carbs that were jetted and pop offs set, milled head, 13/19 prop, r&d grate, riva ride plate, d plate, jet flow kit, flame arrestors.

  4. #4
    paul c's Avatar
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    any one else have any ideas? thanks. i do have a new cdi out of a 99 xlt 1200 at my dispose.

  5. #5
    All hail the Chief! fullboogie's Avatar
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    The high pitched whine is a classic symptom of a bad PV motor, but I can't imagine why you'd have the problem with two different motors. That leads me to believe a bad CDI, as it controls the PV motor. Try the other CDI and see if that fixes the problem.

    Also, pull the PV motor off and crack the case. Bet you there's corrosion on the circuit board where the 12V wire attaches to it. It's because the motor is not sealed from the factory. You should run a bead of silicone around a good motor and where the wires enter the case. It's the only way to waterproof it.

  6. #6
    paul c's Avatar
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    i will check both motors for corrosion and try the other cdi, thanks.

  7. #7
    YudLuz2's Avatar
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    You have another bad PV motor

  8. #8
    paul c's Avatar
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    thats what i figured by now. if it still seems to cycle the valves correctly is it going to affect performance?

  9. #9
    Waveruiner pauladave's Avatar
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    Just a thought, but I worked on a friends 1200 last month that had a problem with p/v operation and it turned out to be p/v cables that were too tight. The motor kept trying to cycle,but couldn't complete the cycle,so kept trying!Adjusted the cables as per the manual and it sorted it.May be worth a quick check.

  10. #10
    paul c's Avatar
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    thanks, i will double check that.

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