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Reed Valves - 1987 V4 140 Evinrude

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  • Reed Valves - 1987 V4 140 Evinrude

    I am trying to resolve an issue with my motor. At idle the motor seems to hunt through the rev range of 800 - 1100.
    Now I pulled out the stock reed valves and apon inspection they seem squeaky clean. They seemed to seal as per design but it could be a different story when in operation. I entertained the idea about replacing them with some Boyesen reed valves but $1000+ later there is no guarantee that will fix my issue.
    Has anyone on this forum changed their stock reed valves to Boyesen reed valves and have experienced better idle / performance with their loopers?
    Any feedback would be greatly appreciated
    Thanks and regards.

  • #2
    I don't see how a reed plate/leaf valve could affect the idle rpm at the lowest desired setting (idle).

    Is this problem similar to slowly increasing and decreasing the throttle (fuel)...or... a sudden instant rpm changing up and down when sitting at an idle...or... is it simply that when retarding the throttle from a in gear higher rpm, the idle is not always in the same place?


    • #3
      Thanks Joe for replying as you always do.
      It would be best described to slowly increasing and decreasing the throttle.
      thanks and regards.


      • #4
        Through investigation, the throttle valve shafts are bent. I am going to straighten. A Lync and Sync and hopefully this will solve the hunting problem at idle.