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  1. 9

    Mercruiser 454 Mag random stalling and won't start back up after stalling.

    Hi everyone, I'm having a stalling and not starting issue with my carbureted 7.4 mag. It has a Rochester 4 barrel, Thunderbolt 4 Ignition, and is all stock. So it happened the first time last week on the boat ramp, while still strapped to the trailer but in the water enough to suck water, it...
  2. 9

    1991 Mercruiser 7.4L Alternator/ wiring issues.

    I was having issues with my old alternator getting hot while not under any load, it was getting to over 300*f. So I purchased a brand new mando 65amp alternator identical to the one that was on the engine. I also replaced the battery cables and grounds with 2 gauge and 4 gauge wire from a...
  3. 9

    7.4 mag won't start.

    7.4 mag, carbureted, thunderbolt 4 ign. Started the engine to day for the first time this season to warm it up and do an oil change. Engine started up easily and ran great for about 5 minutes with the throttle open slightly. Once I closer the throttle to see if it would idle it stalled out and...
  4. 9

    Clogged up cooling jacket? Cannot drain block.

    I was in the process of winterizing my carbureted and raw water cooled 7.4 and my coolant passesges near the drain plugs are so clogged up I can only get one side to drip a bit. I was at it for hours with picks, stiff wire, and compressed air, I also tried running the engine with the plugs out...
  5. 9

    Mercruiser 454 Mag carburetor flooding at idle and stalling.

    I have a Rochester quadrajet 4 barrel carb that has developed a stalling issue at idle once engine is warmed up. It runs great at any other rpm and has no hesitation. The reason I believe it's flooding vs starving for fuel is that I can "catch" it usually before it stalls by giving it throttle...
  6. 9

    1991 mercruiser 454 mag wont go past 2200 rpm under load. As well as the starboard exhaust riser is not cooling properly.

    Hello, I hope everyone had a good Memorial day weekend that wasn't plagued with boat issues like mine was! Anyways month ago I purchased a clean looking and solid hulled 23' 1991 stingray with a 454 mag/bravo 1, I do not know what kind of ignition system it has. And I did not test drive the...
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