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    50Mercury thunderbolt won't idle or open all the way up

    I have a mercury500 thunderbolt 50hp starts up fine won't idle or open up all the way. It has 120psi on all four cylinder so I was taking off the carbs to rebuild when I noticed a 2x1/2 inch hole to the left and under the upper carb guess I'm just wondering if I should fix it or what would cause...
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    Compression

    What's good compression on a 40hp Mercury outboard
  3. H

    93 mariner25 backfires from propeller

    I have a mariner 25hp will only start at full throttle. When I try to slowly let off gas backfires from propeller and dies. I have cleaned an rebuilt the carb new fuel line all the way to the gas tank Slator,power pack,and coils good.good compression and no sheared key on the flywheel O and oil...
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