When it comes to mounting a motorcycle, it is generally recommended for the rider to mount the motorcycle first, followed by any passengers. This ensures that the rider has proper control over the motorcycle's balance and stability before additional weight is added. Passengers should wait for the rider to securely position themselves on the motorcycle and signal that it's safe to mount before doing so themselves. Safety should always be the top priority, so it's important to follow proper mounting procedures and wear appropriate safety gear when riding a motorcycle.