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  1. R

    1988 Mercury 90 RPM Issue

    It is the three cylinder
  2. R

    1988 Mercury 90 RPM Issue

    The rpm issue can happen immediately after launch or when it's been running for two hours. when it will only go up to 3000 rpm's it happens whether you go full throttle fast and gradual to full throttle. I didn't do anything when it shot back up to full rpm's, I left the throttle lever at full...
  3. R

    1988 Mercury 90 RPM Issue

    Intermittent rpm issue, can run fine all day then won't go over 3000 rpm's. Last time out ran fine until heading in, had throttle at full but only hit 3000 rpm's, left throttle at full then after about 2 minutes rpm's just shot up and ran fine. Squeezing the ball doesn't change anything. I...
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