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2 Stroke v. 4 Stroke Weight

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  • #1

    2 Stroke v. 4 Stroke Weight

    The most common 4 stroke to 2 stroke comparisons I read/hear from people are:
    1. More fuel efficient
    2. Not nearly as loud
    3. Lighter

    #3 always has me scratching my head. Full disclosure, I have no idea what the dry weights are for other outboard manufacturers. So assume the talk of 4 strokes being lighter are non-yamaha motors.??

    I pulled up a comparison sheet for 3 different 150hp models, the HPDI being the lone 2 stroke. As you can see at the bottom of page the weights are similar, 2 of 3 models are exact weights.

    So where is this misperception coming from?



    Jason
    1998 S115TLRW + 1976 Aquasport 170
    Tags: None
  • #2
    Have never heard of any discussions saying 4-strokes are lighter. It's the opposite - 4-strokes have traditionally been heavier. There's plenty of discussions about that. Newer 4-strokes have come down in weight, though, to be closer to 2-strokes.
    2000 Yamaha OX66 250HP SX250TXRY 61AX103847T
    1982 Grady Weekender/Offshore (removed stern drive & modded to be an OB)

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    • #3
      Did a little looking, not gonna cut and paste a bunch of stuff. Assuming the publications are accurate from Yamaha, here is some comparisons on dry weight of several models of motors.

      Comparable Yamaha F115LB 2017 four stroke is 21lbs. heavier than your 1998 115TLRW

      Comparable Yamaha 2017 F150XB four stroke is 24lbs. heavier than my 2001 SX150TXRZ

      Comparable Yamaha F250XB four stroke is 58 lbs. heavier then Dennis' 2000 SX250TXRY

      Now, comparable Yamaha F150XB 2017 four stroke is 14 lbs. heavier than Townsends' 2006 F150TXR four stroke.

      Other models and manufacturers, I don't care to look up. So who knows.

      I do know, IMO, I like the performance of my two stroke and hope not have to repower with a four stroke for quite some time.
      Last edited by cpostis; 01-14-2017, 12:52 AM.
      Chuck,
      1997 Mako 191 w/2001 Yamaha SX150 TXRZ Pushing Her

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      • #4
        When I re-powered from my Evinrude V6 150 to the in-line4, F150, I was told it was the same weight or lighter.

        The boat sits lower in the water at the stern (maybe 1" -1.5" tops). Even being an in-line 4, it's NOT lighter than the Evinrude.

        Maybe the engine configuration V6, vs V4 vs inline is what their talking about.

        It is definitly WAY QUIETER at slow speeds than the 2 stroke. When I first went out, I thought the hull had a major leak when I was at the helm...
        Turned out, I could NOW hear water simply sloshing at the transom, where before, no way...

        Flushing out of the water, on muffs, the 2 stroke is easily 4-5 times louder. I don't think my 4 stroke (out of the water) is any louder than my motorcycle...
        Scott
        1997 Angler 204, Center Console powered by a 2006 Yamaha F150TXR

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        • #5
          I always wondered why Verados with the same hp as a comparable Yamaha were much heavier. Half the displacement too...Does a supercharger weigh 75 lbs. I doubt it...

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          • #6
            Originally posted by cpostis View Post
            I do know, IMO, I like the performance of my two stroke and hope not have to repower with a four stroke for quite some time.
            You got that right bud. I know I'll have to address the 2 stroke - 4 stroke decision when I get a larger boat. Kinda dread that decision. Tough to put a price tag on simplicity, which is what carbed 2 stroke engines provide.
            Jason
            1998 S115TLRW + 1976 Aquasport 170

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            • #7
              Originally posted by TownsendsFJR1300 View Post
              It is definitly WAY QUIETER at slow speeds than the 2 stroke. When I first went out, I thought the hull had a major leak when I was at the helm...
              Turned out, I could NOW hear water simply sloshing at the transom, where before, no way...

              Flushing out of the water, on muffs, the 2 stroke is easily 4-5 times louder. I don't think my 4 stroke (out of the water) is any louder than my motorcycle...
              No doubting the stark contrast of decibels. My fishing buddy in miami didn't like his neighbor so much. As he and I would dock the boat behind his house, before shutting down the engine he'd "2 stroke'um".....rev the engine up, hoping to wake up the neighbor he didn't like. It was quite funny at the time.

              In contrast, years ago when 4 strokes were just becoming popular, my uncle re-rigged from the Vmax 150 to F150. For about a year he had a problem with starting the engine when it was already running. The ole crusty salt couldn't hear the engine was already running lol.
              Jason
              1998 S115TLRW + 1976 Aquasport 170

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              • #8
                IMHO this is a non-issue.

                I recall our 90 hp TLR 2-stroke weighs in near 100# less than current 90 hp 4-strokes, but that's apples to oranges.

                The three cylinder 90 TLR was known for best power to weight, but the same rating in 4 stroke require another cylinder. You also have lots more valve train and emmissions clutter.

                Even Evenrude's new direct injected 90 hp 2-stokes weigh about the same as four strokes, but it complies with emmisions and runs quiet.

                The new 4 stroke motors have a completely different power curve and to my knowledge need different props than the now not available 2 strokes.

                And that's why I feel this is a non-issue - you can't buy the traditional two strokes anymore. If your including used, then best bang for available cash decides.

                But, I agree, it your 2-stroke runs well and serves your purpose, best to run 'till death do you part.

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