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#1
10-18-2025, 06:26 PM
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Mercury 115 4 stroke EFI 2018
The problem is : the outboard is running 1000 rpms higher than usual but going 10mph slower. It is not the prop . This issue just started two trips ago. Thought it was a spun hub on the prop, Wrong swapped out the prop and the same results today, high rpms and slower speed with a 1.5 gph drop in fuel efficiency . Any thoughts would be very much appreciated
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#2
10-21-2025, 03:23 PM
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Re: Mercury 115 4 stroke EFI 2018
How clean is the bottom of the boat? And lower unit?
Quote:
__________________
Capt. Debs Tow boat captain/salvor 50 ton USCG Master NJ Boating College- Lead Instructor Big time hottie crabber 
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