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  1. #1
    TuckrD's Avatar
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    GPR vs XLT Ebox Power valve issue

    Hello, I was looking to get more information of the power valves. Called a Yamaha dealer in So. California and after 30 minutes, was no clearer on why or why they are not responding. My 2000 GPR ebox we believe took a crap (was running at 98% potential, and then went to 40% ish, replaced the plugs and ebox, and now at 60+ %), and we purchased a purchased a used 2001 XLT ebox. Plugged it up and went for a ride. The power valves respond to the rev limit and also on the power down cycle, but was told that it also, during start up, did a placement cycle. When first installed, the valves would open at holeshot, stutter and close, as if in a fail cycle. Is this a thing? Did the Power valve adjustment and the holes match up (with WE clips).
    Ski will do 43-45, with the power valve issue, When I unplug and manually actuate the PVs, can get into low 50 ish.

    The questions are:
    1. Are these boxes interchangeable as far as the power valve logic goes? CDI?

    2. When I get to the 5200 rpm ish area that it is to open at, the valves don't respond? Circles back to Q 1.

    3. Opened up the covers and relatively clean inside (cleaned while in there) and very free moving.

    Compression is 125 +- 5 on all three, oil pump delete, flapper removed, d-plate, flame arrestors, free flow, jetted to Cajundude/OsideBill specs.

    Did a search and found no particular post in this effect, or I wasnt using proper keywords.

    Since I am at it, also, our tune when running well was 3 (full) turns on Low and 1.5 on the highs, any lower with the t- handles, engine is hurting for fuel. Plugs are proper color from what I have read and saw on the forums. Why need so many turns,?
    Thanks for your help in advance.


  2. #2
    powerstroke specialist mikegp's Avatar
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    as far as i know the cdis are the same , if valves are not opening most like it the motor is bad, or there is a problem in one of the valves. have you try to disconnect the cables and move the valves manually?

  3. #3
    TuckrD's Avatar
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    Valves move freely and have the WE installed. Have adjustd them and everything. Just switched my old CDI into the newer ebox. Will see.

  4. #4

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    Take the cover off the powervalve servo and be sure the allen screw that holds the cable cam to the motor is tight. I had one that acted funny like that and it was the screw was loose, letting the motor turn it sometimes and sometimes not. Simple fix.

  5. #5

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    Quote Originally Posted by TuckrD View Post
    Since I am at it, also, our tune when running well was 3 (full) turns on Low and 1.5 on the highs, any lower with the t- handles, engine is hurting for fuel. Plugs are proper color from what I have read and saw on the forums. Why need so many turns,?
    Thanks for your help in advance.
    It is possible that you can be overwashing your plugs with excess fuel because your jets are turned out so much. The only way you will know for sure that you have good combustion is with a good aftermarked tachometer. Your rpms and your top end should increase as you turn your screws in. You should only do this with a good aftermarket tach.

  6. #6
    TuckrD's Avatar
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    The ski will be back on the water tomorrow. Thanks for all the input, I have looked into the screw issue LT1GMC noted, and all is good. When I swapped he CDI from the my old EBOX to the newer XLT one, it seemed that the valves out of water seemed to work like normal. Will update my findings.
    When I took the ski out yesterday, I put the lows back to 1 turn, and had no low end punch, as I got to 2.5 it was coming back, but with the PV issue, won't know for sure. I bought the ski a little over a year ago, wondering the engine is bored out a little more, deeming my jets still too small?

  7. #7
    TuckrD's Avatar
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    So, went out today and saw no real positive results. We believe it to be a faulty PV servo. With that being said, is the 03-04 GP1300R PV servo motor interchangable with the 00-02 GP1200R? I know that connectors are different. The 13 has what looks to be a 5 pin connector and the 12 with just 3. Thanks in advance.

  8. #8
    should be all the same just swap connectors

  9. #9
    TuckrD's Avatar
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    Don't understand how a 5 pin can be converted to a 3 pin?

  10. #10
    powerstroke specialist mikegp's Avatar
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    Quote Originally Posted by TuckrD View Post
    Don't understand how a 5 pin can be converted to a 3 pin?
    negative, you will need a 1200r servo. 1300r will not work , and i told you the servo was bad.

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