Electronic servo-controlled power valves are great for providing a wider power output, reduced noise and emissions, along with an improvement in fuel economy. They...

Electronic servo-controlled power valves are great for providing a wider power output, reduced noise and emissions, along with an improvement in fuel economy. They are not, however, totally service-free. The cables used to connect the servo motor to the valve will, as will most cables, stretch over time and use. Many times the cable for one cylinder will stretch more than the other. Bottom line, when the cables stretch the valve will not fully open and the exhaust port will not be as tall; translation, you’re losing top end horsepower. It may pull good off the line but is really flat at wide open, especially with a good clutching set-up that really loads the engine.

Arctic Cat engines fitted with APV power valves should have their cables checked at least every 1000 miles and adjusted as needed. The cable lengths should be as follows: 2003 Firecat 700: 37.15mm (1.462”); 2004 Firecat 700: 34.5mm (1.35”); 2003 ZR/MC 800 & 900: 30.6mm (1.20”); 2004 ZR/MC 800 & 900: 38.5mm (1.51”).

  • Troy

    January 14, 2009 #1 Author

    I purchased a 2003 FireCat 500 (carb), which is a great snowmobile, however iam dissapointed with the power valve set-up. I have re-adjusted my cables several time, becasue one cable always seems to be “slack” compared to the other. After a few rides the cable is “slack again. On a regular bases (especially if it’s cold) the valves will stick and not open up. Usually causing the cables to pop-0ff the electronic servo-motor. I was told that there is an APV Kit update for 03 firecats. Is this true.? Really appreciate any advice.

  • travis

    February 9, 2013 #2 Author

    Hey I just bought a 2003 zl 600 efi. I went to clean the
    Power valves took them out and forgot which way to put
    Them back in. Does the concave part stay up or down? And I’m
    Not sure what the adjustment measurement is for the cable and
    Even where I’m suppose to measure. Can someone help me out?

  • nick

    March 7, 2013 #3 Author

    concave stays up bud .. pop cap off servo motor end of cable casing to where it attaches is where its measured not sure on the specs

  • Aaron wight

    January 29, 2016 #4 Author

    How about 2011 m8?

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