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Mark the shade tree guy
 
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Default 1986 - 50 HP Mercury Engine Trouble

My 86 Tracker engine has two top speeds. The engine starts ok, idles fine
and is reliable. However, sometimes (most of the time) it has two
high-end top speeds. When it is “normal” it turns about 60k rpms. The
lower rpm is about 45-48. Sometimes it kicks in when hitting a wake.
Other times it stays at the slower speed. It was just tuned up and the
top coil stator under the flywheel was replaced. Does anyone have any
idea what the problem is and how it may be repaired? Thanks.