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  1. R

    Timing ? Boat won't plane 1968 merc 500

    16 foot fiberglass boat with Merc 500 - 50hp. Boat doesn't get enough power wide open to get on plane. Runs great at idle, and slow trolling and medium speeds.<br /><br />A couple of notes: the engine won't shut off until you hold the choke down after shutting off the key.<br /><br />Also...
  2. R

    '68 Merc 500, bad fuel pump? high speed sputtering.

    I've got a Merc 500 50hp outboard 1968. Runs fine starting out, at high speed, with a full tank.... then after several hours of trolling at low speeds... when you try to go full throttle, it kind of sputters and won't run as well as it should. New gas tank. Same problem.<br /><br />After...
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