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1720 115hp vs 135 vs 150

Looking into getting into a ac 1720, have seen a few of them for sale with all listed above engines. Which engine would be the best for the hull, I'm looking for a faster tournament redfishing boat but don't want to kill draft and have it porpose all the time and sit stern heavy. If the advantage of the would only be like a 7 inch draft compared to 8 it wouldn't matter to me if I could run 10 mph faster but what's everyone's take on this?


  • kmagnusskmagnuss Posts: 3,237 Captain
    I had a 89' 17' AC Bayrunner and currently have a 99' 1720 so have a little bit to compare these.
    Some 1720's were rated for a 150 while some were only rated for 135... I've never been able to determine why this is.
    The 150 and 135 are the exact same motor (in Mercury anyway) just with a different fuel map and restrictor plates in the 135. Top end of a 150 is usually about 2 mph more than a 135 but I "heard" that holeshot is a little better. My 1720 with 135 and 21p "laser 2" 3 blade prop will hit 53 on a good day but normally hits 50/51 at WOT. I actually think I should have a 19p since my max rpms is usually only 5200-5300.
    On my old 89' 17' bayrunner I had a Merc 90 carb'd 2 stroke, which weighs about 140 lbs less than the 135... that boat topped out at 38 usually.
    Neither of these boats drafted anywhere near 7-8". The 89 was 10.5" and the 99 is 11". The 99's hull is wider than the 89 that's why it's only 1/2" difference between the two even with 140 lbs extra on there. Both of these boats had a power pole but the 99 has a jack plate. Batteries for the 89' were in the back and the 99's are in front part of console.

    When the day comes for me to repower I will most likely go with a 115 for the weight savings. 2 stroke of course.

    Just my 2 cents.

    Tarpon... everything else is just bait.
    Captain Keith - Crooked Rod Charters
  • Angler SystemsAngler Systems Posts: 919 Officer
    I have a 1720se with a 150 Opti. Yes, the boat sits slightly stern heavy but fishes level with two anglers on the bow.

    The boat is rated for a 150 IF it has hydraulic steering, 135 if not.
  • kmagnusskmagnuss Posts: 3,237 Captain
    Hmmmm.... mine has hydraulic steering but only rated at 135. I wonder if mine was an add-on.
    Tarpon... everything else is just bait.
    Captain Keith - Crooked Rod Charters
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