My 2 1/2 hp 2 cycle dinghy motor, a Mariner (Mercury under a different name
I believe), has begun to exhibit some strange behavior. It starts
perfectly
fine, generally on the first or second pull, runs normally for about 4 or
5
minutes, and then gradually slows and stops. Pull the starter cord, and it
starts right up and repeats the behavior.
At first I thought it might be the vent partially plugged, creating a
vacuum
in the tank as the motor ran, but running the engine with an unscrewed
filler cap didn't change the behavior.
Any thoughts as to what might be causing the problem? This is the first
time
I've run it since last season, and at that time it wasn't exhibiting this
behavior. Another point of reference: while I filled the tank with fresh
fuel before starting this year, I hadn't run the engine dry before storing
it for the winter, so some fuel probably remained in the fuel system over
the winter.
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