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Question for the two-cycle engine experts

ralral Posts: 1,847 Mega Baller
I have a "classic" (i.e. old) boat with a 1991 135 HP Mercury Black Max. Last year, the RPM indicator stopped working ( it is getting power, as when ignition is off, it points to 900 RPM, and when on, it goes to zero. During last year's maintenance, the mechanic made it work again, and it was working until today. I assume it is a loose connection.

Anyone can point out where to look at?
Rodrigo Andai


  • WaternutWaternut Posts: 1,511 Crazy Baller
    I think it's probably just a loose/corroded wire or the gauge face is interfering with the needle. I don't think it has anything to do with it being a 2 stroke though.
  • JordanJordan Posts: 1,257 ★★★Triple Panda Award Recipient ★★★
    Likely a bad ground.
  • ralral Posts: 1,847 Mega Baller
    Thanks. Found it. I was a bad contact in the grey cable that attachs to the rectifier (see pic).

    Internet is great,
    Rodrigo Andai
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