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  1. #1

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    RPM fluctuation/FX HO 2006

    Hey Guys,

    The second ski I bought used has always been fluctuating a little on the RPM when idling, basically the dial plays a little like 100-200 RPM. This last trip I noticed that when revving from idle up, right before it gets to 2000, it vibrates as if it was running on 3 cylinder although it's not but it clears anything higher than 2000 rpm. I came home and changed the spark plugs but that didn't seem to change anything. BTW, I started it after one week, and I heard pop like backfire when it started. Tried it a few more times and that didn't happen. But I also noticed everytime I start it the idle RPM tends to be either very LOW like 1100 or normal...So now I see two idle RPM range....

    So questions are:

    1. What causes idle RPM to play
    2. Why don't I have a smooth range from 1300-2000

    Any help is appreciated and my other ski with 200 hours is like clock work. This one has only 80 hours...


  2. #2

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    I'm thinking here, is it possible it is a slightly dirty injector on one of the cylinder? Compression on all cylinders are high and very close to each other.

  3. #3
    db2540's Avatar
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    May 2009
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    I have had a similar problem that ended up being a combination of to two things. First there was quite a lot of water in the spark plug holes. Second a dodgy connection on number 4 coil pack. I experienced rough idle and a drop of about 500rpm up top. I replaced plug and cleaned up both plug and coil pack the best I could and put some electrical connection grease on the plug.

  4. #4

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    I talked a friend on PWC site who is an expert, he says my Throttle Positioning Sensor might be out of tune.

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