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Help - Merc 454 can only get to 3900 rpm wot

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Old 06-23-2015, 09:22 AM
  #41  
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Originally Posted by airjunky
Damn . Sounds like you have the orig carb mag motor if the little tin tag on the back lower side of the block near bellhousing confirms it .should have enough balls to spin a 19 past 4000 rpm with a plug wire pulled and old gas.
Your going to find something .
Based on your comment, sounds like these motors are either rare or desired/high performance?

I believe these are 365hp stock. Hopefully the gummed up cap was a major contributor to my issue. I'll provide an update once I get my outdrive back on. Thx
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Old 06-23-2015, 09:24 AM
  #42  
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Originally Posted by GLENAMY 242SS
Alex, were you able to gain any info from my email?
Thanks for the file. Based on it I was able to find the tag beside the starter to confirm the serial number matched the writing on the plastic cover over the carb
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Old 06-23-2015, 09:28 AM
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Two flathead screwdrivers on opposite sides and underneath of the rotor/sensor wheel will normally pry them up off the distributer. No need for locktite on the reinstall.
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Old 06-24-2015, 11:12 PM
  #44  
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Got the new rotor on, and cap. Finally got my outdrive fixed and back on, so I hose tested it just now. Started the first crank, and sounded real nice. Revved it a few times, and I can honestly say I never heard it sound so nice and powerful. Can't wait to lake test it tomorrow. I'll provide an update then. Only problem is it won't be comparing apples to apples, since I've now put on my new 21P prop (vs the 19P before). Still hoping to push this bigger prop to 4200+. Thanks
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Old 06-24-2015, 11:39 PM
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Now you know you have the big port high rise intake good rat motor if you cant spin a 21 past 4500 your sleek has gold bars hidden under the floor . Or 6 sets of y pipe flappers jammed in the exhaust . Or the tach is off .or crossed wires. Really ,the only thing that scares me is why the heck was a 19 ,i assume 3 blade ,on there.
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Old 06-24-2015, 11:44 PM
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365 in your boat with 3 people should spin a 23 to 4500 + and 60 + give or take a bit.
18436572 . Cross the right wires and it wont backfire too
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Old 06-25-2015, 10:30 AM
  #47  
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Originally Posted by airjunky
18436572 . Cross the right wires and it wont backfire too
Little confused by this. I know 18436572 implies the proper firing order. Are you confirming this is needed to prevent backfiring, or is there some recommended swap/crossing of wires to prevent backfiring? While on the subject, does it matter if the insulation of some wires along the cap are touching? Should I try to space them such that none are touching?
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Old 06-25-2015, 10:45 AM
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Use proper firing order wires can be touching make sure they are in good condition.
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Old 06-25-2015, 11:08 AM
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They will touch if they are a good quality wire you will not have an issue, however try to route them not to touch
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Old 06-25-2015, 11:47 AM
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+ way better than = . Each line on the symbols to left is a wire. Keep #5 and #7 very far away from each other.
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