Final answer:
Before starting a borrowed motorcycle, check the oil and tire pressure, fill the gas tank, and avoid washing it thoroughly.
Step-by-step explanation:
Before starting the engine of a borrowed motorcycle, it is important to check the oil and tire pressure, as these are crucial for the safe and smooth operation of the motorcycle. This ensures that the engine has sufficient lubrication and that the tires are properly inflated, reducing the risk of accidents or mechanical issues.
Filling the gas tank is also important before starting the engine, as an empty or low fuel tank can cause the engine to stall or stop while riding.
Washing the motorcycle thoroughly is not a necessary step before starting the engine, as cleanliness does not directly affect the functionality of the motorcycle.