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  1. M

    im stumped

    Ok so ive posted a few threads and im still working on this, so i hope yall will will cut a new boater some slack lol. My 1978 mercury black max 150 hp is not running full rpms. I figured out it was the prop im running a 13.75" diameter x 21 pitch prop (not 24 pitch like i had previously posted)...
  2. M

    how to find the right prop

    Ok so everyone here has been very helpful so ive got another thing to ask. I have a 1978 sea star made by glasstek with a 150hp mercury v1500 black max motor. Im havin prop trouble the 24 pitch im running puts to much drag on the motor and only lets it get to 4000 rpm at WOT in the water. I have...
  3. M

    1978 mercury black max service manual

    Hi I'm looking to but an oem service manual for my 1978 mercury black max 150hp v6... i think its actually called a black max v1500... I can't find a manual anywhere, does anyone here know where I could get one?
  4. M

    1978 150 horse mercury black max on 1978 sea star 18ft tri hull

    This is my first boat so im new to all of this. My question is how fast should my rpms be turning at full throttle down the river im only getting about 4000-4500 rms on a 21 pitch prop top speed about 35 loaded with 5 people. Is this right? Also it idles fine on the hose and when i first start...
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