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  1. A

    Yamaha 90HP

    "the problem is that the upper "the problem is that the upper plug responds very very weak, and causes for backfires and runs leap . 1. i replaced plugs . 2. cheked compretion and all three are good. 3. there is agood spark from the coil (the upper one was good all so ). 4. and the carbs...
  2. A

    Yamaha 90HP halted

    "the engine seems to run fine "the engine seems to run fine and suddenly starts to backfire and stops, then he will hardly start and would run leap even on full throttle after while he breach and runs ok it happens every time. i try to chek the parameters when it happens and: 1. there is a...
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    Yamaha 90HP piston pin pleas help

    i am replacenig piston pin on i am replacenig piston pin on yamaha 90 HP the new piston pin that i bay are 1/2" shorter then the original they are perfectly size in the piston can any one know if it is ok ??
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