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Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 3979
Experience:  US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.
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My 2003 115 2 stroke it started this season running great

Customer Question

my 2003 johnson 115 2 stroke it started this season running great guns 45oo-5000.rpms about 5 mins the rpms droped down to 2000.
Full throttle it seems to be laboring . I have replaced the fuel , new filter and bulb. please help
Submitted: 1 year ago.
Category: Boat
Expert:  Charles replied 1 year ago.

Hello, my name is***** will assist you.

Expert:  Charles replied 1 year ago.

Was the alarm sounding when the engine slowed?

Do you hear the alarm test beep when you turn the key to the ON position?

Customer: replied 1 year ago.
I have also noticed the tack working sometimes also.
Expert:  Charles replied 1 year ago.

Test the voltage on the running engine at the starter solenoid. At idle it should read about 12.5V DC, at 2500 RPM it should be about 14.2V

Customer: replied 1 year ago.
My garmin says 14.2 at 2500 voltage seems good i think.
Expert:  Charles replied 1 year ago.

Thats good. When was the last time that the cooling system was serviced?