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  1. #1

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    01' XL800 Power Valve Problems

    I recently got this XL800 that had trouble getting on plane but ran fine wide open. To make a long story a little shorter, I noticed that the power valves were staying in the open position all the time. You can rotate the actuator by hand to the closed position and they will open when the system demands it (at engine shut down or when the revs get to around 4000) but never close. The motor only operates in one direction. I looked for bad connections but haven't found any. Should I suspect a bad actuator or CDI box?

    Thanks for the much help needed!


  2. #2
    A child of five would understand this. Go get one. pierowman's Avatar
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    What happens to them when you shut it down?

  3. #3

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    about 3 seconds after the engine stops they move to the open position but dont return to the closed position.
    Last edited by JH1200A1; 07-26-2012 at 01:55 PM. Reason: typo

  4. #4
    A child of five would understand this. Go get one. pierowman's Avatar
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    I would put a meter on the leads going to the actuator. If it looks like its getting both the open and close signal then you know which one has the problem. Also a spare actuator and you could swap it and try it. The most likely part to fail is the actuator.

    You said you can move the powervalves by hand, they are not sticking at all are they? I mean they are very easy to turn no resistance or sticky feeling?

  5. #5
    mudslanger's Avatar
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    Pull the rubber cover off the power valve motor and make sure the cables are in the correct place. there is a 1 and 2 on the power valve motor and the power valve wheel. also if they are in the correct place pull them off the PV wheel and cycle the motor wile holding the cable ends and see if you can install them without binding the PV motor or turning the PV motor wile the power valves are closed.

  6. #6

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    Thanks for the replies!
    I took the pulley off the actuator and the valves work smooth. No binding or sticking. I also took the actuator apart to see if I could see anthing wrong in there. The motor and electronics are sealed. The actuator works like a servo used in radio controlled planes, cars, helicopters etc. Before knowing that, I was checking to see if the red and black wires changed polarity but that wont happen. The gray wire is the signal wire and it tells the actuator which direction to move. A scope will have to be used to check it further.
    In all, I think the actuator may be bad.

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