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  1. J

    Question for Yamaha specialists, 50 DETO

    Hello, Last summer, I reported some troubles with my 50 Deto that would not rev more than 4400 rpm. I worked on it this winter to try to find what would cause this. I checked timing with a timing lamp, checked pulser coils with a scope, and checked sparks with an homemade spark tester. The...
  2. J

    Yamaha 50 power loss / no rpm past 4400

    Hello, I've read a lot of posts about Yamaha motors, but didn't found how to solve my problem. I own a 50 HP Yamaha 3 cylinders, year 1989, on a 4,5 meters fiberglass open style boat. The problem is that the boat wont go past 24 to 26 knots, and the motor can't just go past 4400 Rpm. It...
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