Mercury 4 stroke EFI 25 hp Losing Power

[tblack111]

I have a 2007 4 stroke 25hp Mercury that had been running 5500 RPM. Earliar this week on the lake, after a fill up and 2 oz. of stabill, I dropped to 5000 Rpm.... Hit some turbulant water and it bounced back to 5500. Went out today and could only get 4200 to 4800 RPM...which of course slows my speed. Engine runs smooth... I just lost my RPMs. Plugs were changed in January and still look good. Funny it happened after a fill up and stabill treatment. Any idea of wat may cause the rpm loss? Runs smooth as ever, just not the power I have been ecustomed too for the past year.'

Thanks

 

[tblack111]

Re: Mercury 4 stroke EFI 25 hp Losing Power

Tryed changing out my gas....got on the water, up to about 5200 rpm and zilch. She locked down. No smoke, no skip, no bells, whisltles or signs of distress. Would ot turn over, could'nt even pull the pull chord.....MAJOR PROBLEM

 

[grandpaclint]

Re: Mercury 4 stroke EFI 25 hp Losing Power

sounds like time for the old junkyard time