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  1. M

    Malfunctioning tachometer or something else?

    I have a Mercury 90 Fourstroke EFI. The engine just recently had a new fuel supply module installed. When I took it for the first run yesterday since having it winterized all season I noticed that the RPMS at WOT were about 1000 more than they were last year at around 6500-7000 depending on...
  2. M

    Mercury 90 EFI losing power intermittently

    I have a 2008 Mercury 90 EFI on my 170 Montauk. 4 times in the past two weeks when running at different speeds it feels as though the engine loses all power but still stays running. During the loss of power, even if I open it all full throttle it sounds as though it is not getting fuel and the...
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