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What would the gear oil have to do with ANYTHING?Part # of the new starter ?-----Was the new battery load tested ?-----Checked lower unit oil ? ----Is it a 4 stroke ?------How did it run for you last season ?
With the key out of the ignition switch, try to turn the prop without touching anything else. If it doesn't want to turn, make sure to get it to go into neutral by disconnecting the shift cable and try it again. If it IS in gear with the helm in the neutral/centered position, make sure the cable isn't stretched.2000 mercury 50 hp wont turn over with spark plugs in, turns over fine when out, new starter, new battery