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F150 4 cycle Stumbles/hesitation around 1600 rpm

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  • F150 4 cycle Stumbles/hesitation around 1600 rpm

    My yamaha 150hp 4 cycle idles well and runs well above 2000 rpm. Around 1400 rpm to 1800 rpm it hesitates or runs rough until above 1800 rpm. I have changed plugs, fuel filter, fuel injectors and tested compression (all around 100 psi) with no change. Any ideas?

  • #2
    I have no idea on what would cause the hesitation except timing advancement not happening correctly or maybe too lean during the transition

    also 100PSI compression on a 2 stroke might be OK, but I thought most 4 strokes were a lot higher

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    • #3
      From my F150 Yamaha shop manual:






      Capture.JPG
      Scott
      1997 Angler 204, Center Console powered by a 2006 Yamaha F150TXR

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      • #4
        Follow up The compression was 200 psi which was my mistake. The problem turned out to be a bad throttle position sensor. All is well. Thanks

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        • #5
          thanks for the update,
          it would be good to have every one come back and say what the problem was
          it would help many more people..
          was the problem with the compression your gauge or something else

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