Originally Posted by Capttater
Good idea Tater.
You can also easily disconnect the pink and black wires going to the overtemp sensor on the head. Then, on the engine side, plug the black wire lead into the pink wire lead. The horn should sound and if it is a Yam digital tach the over temp icon should flash.
Another yearly check is for the low oil alarm. The glass sight tube can be removed and the main oil tank drained into a clean container. When the oil gets low the alarm should sound. Just turn the motor off as soon as the alarm sounds so the motor is never run without oil.
If the alarm does not sound get the system fixed.
It is also good to drain the sight tube/sump from time to time anyway.