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  1. R

    Rpm Drop

    I have a 18ft CC bay boat with an 90hp yamaha. I had a SS 17pitch prop which was running 5900rpm @ wot. I change to a SS 19 pitch because I was over my recommended rpm range. I thought that the 19 would drop my rpm's to around 5500 and I would gain a little more top end , but instead dropped...
  2. R

    trim tab

    I had a problem with my steering. When I would turn one way it was easy , but when I turn the other it was difficult. Well last time out I happen to have broke the trim tab on the motor. After this happen the motor was easy to steer both directions but pulled to the right. Seems like if I fix...
  3. R

    prop question

    I have a 98 Sea Stealth , with a 98 Yamaha 90. With the average load of boat, motor, gas, equip and people @ wot I'm at 4900-5000 rpm's. I have a 17 pitch prop. I have read that if I prop down to a 15 pitch I will gain around 400 rpm's which brings me to the high end of my motors operating range...
  4. R

    prop question

    I have a 98 Sea Stealth , with a 98 Yamaha 90. With the average load of boat, motor, gas, equip and people @ wot I'm at 4900-5000 rpm's. I have a 17 pitch prop. I have read that if I prop down to a 15 pitch I will gain around 400 rpm's which brings me to the high end of my motors operating range...
  5. R

    max rpm

    I have a 1992 85 yamaha with a 18 pitch prop. It's on a 17' aluma weld boat. I'm trying to find out whats the max rpm's for this motor.
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