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  1. #1
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    Mercury 1997 225 (Carb) losing RPM's

    Hello,

    I have twin 225's (2stroke) with the port engine starting to act up. Starting does not sound good, spitting and coughing for a few mins the evens out. When at running (RPMís 4000) the port engine will lose about 400 rpms for a few seconds then advance back to where it was. It cycles through this about every 2 min. At lower RPMís 2000 or lower I donít have an issue. I have changed the plugs, fuel lines and filters. As for fuel there is only 1 220 gal tank that feeds both motors and the starboard engine does not seem to mind it. I read about a throttle speed sensor that controls the timing at higher rpmís. Could this be the issue?</SPAN>

  2. #2
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    central minnesota
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    ck the fuel press after the lift pump (square fuel pump)

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Mazco