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Yamaha 2-stroke 50hp low RPM problem

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  • Yamaha 2-stroke 50hp low RPM problem

    My mechanic is almost at a loss. It 2006 50HP model 50TLR 2 stroke.

    It starts fine and run fine at low RPM. It can rev up at neutral to high RPM levels. BUt when we put it at forward it stays at low RPM even at WOT.

    Compresson is at 120 on all 3 cylinders
    Spark plugs are new
    Fuel pump OK
    Impeller new. Water pump runs good.
    Coil was checked
    Oil level in the tank is at maximum.
    It's not overheating.

    I read some similar post as my situation but I think it might be different because of the high RPM can be reached at neutral.
    Sorry, don't have a tachometer to give you a real RPM value.
    With this RPM, it runs like a 15hp instead of 50hp.

    Does it sounds like a overheating sensor problem?

    Thanks in advance

  • #2
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    test it to see, guessing at things does not help much.

    reving in neutral does not mean much, because it does not need much fuel or power to turn up with no load on the motor
    my guess is carb jets plugged, but easy to check to see if alarm system works as it should and the individual switches are not calling for RPM reduction