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  1. H

    prop diameter difference

    i have a 90 hp evinrude with 13 3/4 15" alum 3 blade prop that runs 4500 to 4800 rpm WOT and i am looking at replaceing it with a composite 4 blade adjustable pitch ( 13 16"-21") prop i know that each adjustment up will decrease rpm by about 200 rpm but what will decreasing the diameter do and...
  2. H

    WOT RPM troubles

    I have an 90hp 1985 evinrude with a 13 3/4 15 prop carbs rebuilt last season about 20hrs on them on a 1984 170 tourney grady white hull everything runs fine wot rpm runs about 4500 to 4800 at about 23 to 26 mph BUT every so often it will jump up to 5000 to 5400 rpm and the boat speed jumps as...
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