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    Top end power loss at WOT on Mercruiser 5.7 Alpha 1997 while under load... why?

    Hello, I am having slight (10%) power loss at WOT and hoping for some tips to restore it. I have a 1997 Maxum 23ft fiberglass powerboat with a Mercruiser 5.7L V8 Alpha (sterndrive) with Thunderbolt ignition (carb) with over 1000hours. I have had the boat for 4 seasons and the engine has always...
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    1999 5.7L abruptly stalls, will turn on again, happens at all RPM few times per trip

    Hello, we have a 1999 Maxum with Mercruiser 5.7 (with carb) and Alpha one Gen II that developed a new stalling issue over the past few weeks. I appears to be increasing in frequency as in now at 4+ stalls per trip. The issue occurs after running the boat for 15+ minutes at higher RPMs, then when...
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    10% decrease in top speed at WOT on Maxum after changing prop with same dimension

    This year I changed the propeller and hub on my 1997 Maxum 2300 Powerboat (Merc 5.7L Alpha 1 Gen 2) and now I have a 10% decrease in top speed at WOT. I understand that the different diameter and pitch of propellers can change top speed and acceleration, etc, but my problem is that I replaced my...
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    Engine Overheating + Cooling System Issues with Maxum 2300sc with Merc 7.4 Bravo 3

    My buddy bought a 23ft Maxum 2300sc fiberglass powerboat that is having problems with the cooling system. The engine and sterndrive are the Mercruiser 7.4 V8 MPI with Bravo 3 (twin prop) all from the year 2000. This model has the freshwater cooling system (heat exhanger on top othe engine) and...
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    Need a prop recommendation for 1991 Bayliner 2556 25ft Flybridge

    Hello all, I have a 25ft 1991 Bayliner 2556 Ciera Flybrige with small block v8 Mercruiser 5.7L engine (with 1150 hours) and Alpha One Gen II outdrive. The boat is heavy ~6000lbs, plus 500-700lbs of fuel and usually between 6-10 passengers (girls). The current prop is a 3 blade mercury aluminum...
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    Toilet Not Bringing in Rinse Water (Jabsco Twist n' Lock)

    Hey All, I have a 2 year old Jabsco Twist n Lock compact marine toilet. When I flush it by pumping the handle up and down it exhausts all my waste just fine, but when I flick the black switch to bring in outside water to rinse the bowl, the vaccum is lost when I pump, and no rinse water comes...
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    Engine Knock or Clanking in Mercruiser V8 5.7L Valve train ...What is this SOUND?!?

    Re: Engine Knock or Clanking in Mercruiser V8 5.7L Valve train .. UPDATE Re: Engine Knock or Clanking in Mercruiser V8 5.7L Valve train .. UPDATE After many of the recent suggestions led back to the exhaust manifold gasket being the source of the noise. I decided put my lifter/rod theory on...
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    Engine Knock or Clanking in Mercruiser V8 5.7L Valve train ...What is this SOUND?!?

    I have a 1991 Bayliner Ciera with small block v8 Mercruiser 5.7L engine (with 1050 hours) and Alpha One Gen II outdrive with freshwater cooling (heat exchanger). During a rare wintertime boat outing I was making my return as ran the boat at normal operating temp @4300rpm for 20 minutes back...
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    Salt water in cylinders of 5.7L Mercruiser V8

    I have a 1991 Bayliner Ciera with small block v8 Mercruiser engine (with 950 hours) and Alpha One Gen II outdrive with freshwater cooling (heat exchanger). During a recent fishing trip in Puget Sound I ran the boat at normal operating temp @4300rpm for 20 minutes to the site, then shut off the...
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