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  1. H

    prop selection

    Hey guys been a while since I've been on here i have a 1971 650 with a lower unit off an 1150 i could only get 8 mph out of it no matter what i did, i did some research and found out the 650 has a gear ratio of 2.3:1 & the 1150 has a gear ratio of 1.7:1 the prop i was using from the 650 was a 12...
  2. H

    l/u 1971 merc 650 4cyl

    Sorry guys I know u have been asked this a 100 times probably, but I need to find a l/u for my motor I don't know what years inter change with it my l/u # is (1623 4934) 3 . I don't know if that helps or not . I measured the drive shaft it was between 20"-20 3/4" my drive shaft does not have a...
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