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  1. Seaduction19

    Post for flame arrestor broke off!!!

    The post bracket on my carburetor broke off leaving me no way to attach the flame arrestor. Has anyone else run into this and found a cheap solution. I'd rather not have to buy a new carb and I haven't been able to find the top by itself for sale. I am a welder but this is an aluminum alloy and...
  2. Seaduction19

    Mercruiser 4.3L pushes 2400# runabout only 36mph max

    I sent the new 21p back because I wasn't reaching the rpms I wanted. It had a 14 1/4in diameter. I don't really want to go lower than that pitch because the theoretical speed a 19p is supposed to create wouldn't fix the issue im trying to solve (I want to try and get the boat in the high 40's.)...
  3. Seaduction19

    Mercruiser 4.3L pushes 2400# runabout only 36mph max

    Hey y'all!!! So spring has arrived and I was able to take the boat out twice. The first day I went out on the river, I was with my buddy (160lbs man), little gear and about 5 gal. of gas. With the 5 blade high-five 19p prop on at WOT and completely trimmed out I was doing 38mph at 4600 rpm. This...
  4. Seaduction19

    Mercruiser 4.3L pushes 2400# runabout only 36mph max

    That’s funny you say that. The boat came with a foil and trim tabs when I got it. First thing I did was rip them both off the boat because they severely affected the boats performance. Oddly enough the foil (even though seeming to be mounted properly and in great condition) would send the boat...
  5. Seaduction19

    Mercruiser 4.3L pushes 2400# runabout only 36mph max

    I would be very happy to get numbers like that. its not necessarily that I even want to gain more speed but the numbers and science tell me that there is in fact something wrong with my boat. Its just odd to me that I am finding posts out there where guys have a 20' runabout with a dry weight of...
  6. Seaduction19

    Mercruiser 4.3L pushes 2400# runabout only 36mph max

    That’s good to hear! Makes me feel more confident that that’s the issue.
  7. Seaduction19

    Mercruiser 4.3L pushes 2400# runabout only 36mph max

    Yes, so I did attach a video to my opening thread. In that video I do have very limited gear. Maybe 100lbs between all required safety gear and a lighter tackle box and fishing pole. I do have a full tank of gas and I’m near 220lbs myself. I do trim correctly and anticipating that question is...
  8. Seaduction19

    Mercruiser 4.3L pushes 2400# runabout only 36mph max

    That was a great tool. I do really find it helpful to find the theoretical speed and using it just irritates me more that I can’t go see for sure what my RPMs were. I do stand with it being around the 4800 though.
  9. Seaduction19

    Mercruiser 4.3L pushes 2400# runabout only 36mph max

    I have literally been stuck on the prop as the problem for days now. After all my research I figured that it has to be that stupid 5 blade but then after sitting on it, I figured, would a 3 blade laser2 21p really give me 15mph more? 52mph seems to be everyone else’s average speed! I’m still...
  10. Seaduction19

    Mercruiser 4.3L pushes 2400# runabout only 36mph max

    The Boat: 1993 Marada Armada 1800MVB roughly 2400 pounds This year engine was replaced with remanufactured 4.3l 2bbl TKS (190) mercruiser. Alpha1 gen2 drive, gear ratio 1.81 with HighFive 19P prop The boat seems to run really well but I feel it’s too slow for what it is. At WOT and planed out...
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