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  1. Grum Man

    Prop help

    I've got a 40HP Merc 4 stroke on my 1958 Grumman "Runabout". Running with a 3 blade, stainless, 10.5x13 Mercury Vengeance prop I get 6100 RPM and 32 MPH. I installed a Solas 10.5x14 Amita 4 blade aluminum and I get 5100 RPM and 29 MPH (everything the same). I love the smoothness of the 4...
  2. Grum Man

    Merc 40HP WOT issue

    First post, enjoy this forum. I bought a 2005 30HP four stroke EFI Merc, new, to put on my '57 Grumman runabout that I redid, (the $250. boat that quickly turned into the $10,000 boat). The motor has been great, except for a chronic high idle that I recently remedied with a Dremel tool (no...
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