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  1. J

    Old Mercruiser 120 3000rpms WOT rated for 3900-4300

    I took the boat out the other day and it made me think of something else. Btw I'm supposed to get a new prop tomm I was going to change that out and then check the timing when I go test that so I will report back. But also sometimes when I throttle up it will not quite want to go and when I back...
  2. J

    Old Mercruiser 120 3000rpms WOT rated for 3900-4300

    I actually just found a nice 15x17 on fb. I do pull tubes and skis so maybe I'll try it out.
  3. J

    Old Mercruiser 120 3000rpms WOT rated for 3900-4300

    As far as drive and prop, it's the original drive as far as I know. Prop is currently a 14x19. It's pretty dinged up so I planned to get a new one. Perhaps I'll try a 17
  4. J

    Old Mercruiser 120 3000rpms WOT rated for 3900-4300

    Ok so I finally got around to it. Compression looks good. Points have been converted to electronic tho so now I'm stuck there. I watched a bunch of videos and looked at my neighbors old hot rod to learn all about points and mine doesn't even have them. Neighbor also let me borrow his timing...
  5. J

    Old Mercruiser 120 3000rpms WOT rated for 3900-4300

    Ok. I know how to check compression. The other 2 things I will have to learn how to do.
  6. J

    Old Mercruiser 120 3000rpms WOT rated for 3900-4300

    I recently bought a 85 cobia 17ft open bow with a 153cid 120 in it. Starts, idles, runs and drives great. Max rpms at wot is 3000 tho which is a bit low. Previous owner had recently replaced rotor, wires and plugs so i don't suspect it's that. Was struggling to get even to 3k and I put in fresh...
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