How do you change a water appeller on a 1988 25hp Johnson boat motor?

To change the water impeller on a 1988 25hp Johnson boat motor, first, make sure the engine is cool and disconnect the battery. Remove the lower unit by unbolting the screws and carefully sliding it off. Take out the old impeller from the water pump housing, clean the area, and install the new impeller, ensuring it’s oriented correctly. Finally, reassemble the lower unit and reconnect the battery, testing the motor to ensure proper cooling.