* "Running the engine below 3,000 rpm for more than 30% of the time so the engine does not warm up (does not reach operating temperature)."
and
* "If the propeller of the stopped motor is left in the water, it may turn as the boat moves through the water, causing a reverse flow of water from the exhaust side. This reverse flow will happen if the stopped engine's propeller is in the water, its gearshift is in “R” (reverse), and the boat is moving forward. Reverse flow can cause an engine malfunction."