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    Optimax 115 reliability?

    I am on the verge of replacing my 1989 100 h.p. (carburated inline 4) with an Opti 115 to be used on a seasonal basis at 8,300+ ft. altitude. Low hours annually. My goal is to improve performance (hole shot and top end speed) to make up for the altitude. (I've ruled out the 4 stroke 115EFI...
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    Optimax vs. Classic Performance

    I'm thinking of replacing my Merc classic with an Optimax 115 h.p. How well does the Optimax actually perform on hole shot, overall acceleration, and top speed compared to a classic of the same h.p.? Any reliability issues I should be aware of? I've read the Mercury literature, but would...
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    '89 merc 100hp won't run 4 cylinders

    This is a 1989 Mercury (under Sea Ray label) 100 h.p. When I give it full throttle, sometimes 4 cyl. will kick in and sometimes not. Occasionally, even when running FOT on all 4 cyl., it will drop back to 2 cyl. I use this boat at 8,300 ft. altitude.<br /><br />The dealer has changed plugs...
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