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  1. 2

    what should merc 250 EFI compression be

    When I check my compression with a guage what should I expect (in PSI) from my 1997 merc 250 EFI outboards ?
  2. 2

    lagging powerband

    I recently finished a new powerhead install on my 1997 merc 250EFI the motor seems to run fine however it seems to be lacking power. I have twins so here is my comparison; with both motors in gear & at idle I go full throttle on one motor & on older power head, motor accelerates to about 2200...
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