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  1. M

    Need Optimax Gurus - at wits end!!

    I have a 2000 225HP Optimax that is running like crap under way / load. It starts, idles and revs perfect but in the water it starts breaking up / surging at around 1200, wont really accelerate unless I floor it then the engine will surge a few times and then accel hard to near 3K, when it hits...
  2. M

    Optimax 225 hard start

    Checked the fuel and air. Air was bouncing around 80 and fuel bouncing around 90. Ordered new fuel filters and a starter cause it was making a noise and I like to have a spare anyway. Going to fill the filter with seafoam on install and add quickleen to the fuel. Going to take the boat out and...
  3. M

    Optimax 225 hard start

    No idea on injectors so I may need to look into that. I am going to run the engine on a portable tank with some quickleen and then on regular gas to see if anything changes. Was told filters were all replaced at end of last season and look new. There is an inline filter that hasn't been replaced...
  4. M

    Optimax 225 hard start

    What do you guys think about using a big 1000+CCA automotive battery instead of a marine battery? So the motor should start easily right? This is not typical optimax behavior?
  5. M

    Optimax 225 hard start

    Hey guys, just got a new to me 1999 Merc optimax 225. At first I couldn't get to start at all and then I read optimax doesn't like to fire on low voltage and it was dipping to 10v while cranking is that true? Seems like if the engine can spin it would fire... so I put the charger on overnight...
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