HOW TO Replace Thermostats Johnson Outboard the EASY WAY!

Port Canaveral Florida. A quick video on how to replace the thermostat on an Johnson outboard the easy way! (90HP V4 1998)

Check your model number here https://www.boats.net/catalog/johnson...

A faulty water pump is a major cause of overheating-related outboard engine failures. An incredible number of pumps are damaged by starting the engine with the gearcase out of the water. Running the engine – even for a few seconds -- without water can destroy the rubber vanes (blades) on the water pump.
Debris – plastic bags, weeds, mud, or a combination thereof – clogging the water intakes on the gearcase won't let sufficient cooling water into the engine. Trimming the outboard up too much while underway or in turns can cause the water pickups to ingest air – this causes a sudden loss of water pressure - not a good thing.

Most late-model outboards have integrated warning/self-preservation systems that sound a buzzer or horn, as well as automatically reducing engine RPMs if the on-board computer detects that the engine temperature is higher than it should be.
The temperature gauge (if equipped) will indicate a higher than normal reading. The water pressure gauge (if equipped) reading can be significantly lower than usual. Gradual loss of power, often accompanied by scary and unusual noises (even sometimes there won't be any noise!) from under the cowling. Smaller outboards may not have sophisticated warning systems, so pay particular attention to the engine's power output and flow of water from the tell-tale tube; if either decreases abnormally, the outboard could be running hot (overheating). Refer to the owner's manual for overheating information specific to your outboard.