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JerryP
07-29-2019, 10:16 PM
I just purchased a 2008 Mercury 25 horse 4 stroke with three cylinders. The engine starts and seems to run fine idles great but feels like it only runs at full throttle around 3000 RPMs. (that's just a guess, there is no RPM guage). What could cause this? Improper throttle cable installation, a speed or RPM regulator? Any help would be greatly appreciated.

timguy
07-29-2019, 11:26 PM
Maybe the previous owner changed the prop because they had it on a small or lightweight boat. Can you check the numbers on the prop and report back to us?

flyingscott
07-30-2019, 01:00 AM
Get a tach first to confirm that.

JerryP
07-30-2019, 07:52 PM
I sure will. Thank you. I know the prop has been changed. Any idea what the proper size and pitch should be?

timguy
07-31-2019, 06:30 PM
Probably a 9.75 X 9.5.