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  1. J

    1999 Mercury 90 HP jet loss of power

    Well the title says most of it but .Anyways I have a friend that has the 90 HP jet.we took it out the other day and runs fine for about 10 minutes (until it gets warmed up) then it seems to go into a slow mode!Stator and trigger were recently replaced.Getting good fuel and coils plus compression...
  2. J

    1974 Johnson v4 spark plugs

    I know this is a topic of many opinions but Im going to throw it out there anyway.I have a 74 johnson V4 115 hp motor.I have a friend with the same motor but a 73.Anyways we took our boats out the other day and at the dock he turns the key and within 3-4 seconds hes running.I have never been...
  3. J

    1974 johnson 115 hp compression

    I am new to the forum,well sorta!Ive been reading posts for years just never registered.Anyways my question is ...I have a 74 johnson V4 that I bought a couple years back.Been a great motor for sure.Love the engine!Anyways I did a compression test today and got 90 psi on all heads.I was shocked...
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