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85evinrude
I have a 1985 Evinrude 15hp w/ a recoil starter.  Last year it would run, but the RPMs would erratically pulsate every now and then.  About 3 or 4 times every 5 minutes of run at mid to wide open throttle.  Then on the last use of the season the motor was running strong and suddenly died.  I have not yet been able to get it to restart since.  The carb has been rebuilt, new fuel pump, new fuel lines, new primer bulb and hoses, new coil pack and spark plugs.  The spark is many times more powerful then it was before, but it still wont start.  The best it will do now is an occasional backfire or 1 or 2 turns on its own and that it.  Any help of what to test or fix would be appreciated.
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85evinrude
checked compression today and found the upper cylinder is 65psi and the lower one just peaks over 60psi.  Anyone have any ideas?
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marinermikes

That compression is low.  It shoiuld be up around 100 pounds.  You may want to take the head off and look at the cylinder walls.  With any luck it may just be a blown head gasket.

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