Which step is NOT part of the engine pre-start routine?

The correct answer indicates that the throttle check is not considered a standard part of the engine pre-start routine in motorcycle riding. During the pre-start routine, the primary focus is on ensuring that the essential components for starting the engine and preparing the motorcycle for operation are functioning properly and safely.

The fuel check involves verifying that there is enough fuel in the tank to operate the motorcycle, which is fundamental for starting the engine. The ignition check is crucial to ensure that the ignition system is functioning properly, allowing the engine to start when required. The choke or clutch check is also necessary, as it helps in regulating fuel flow or disengaging the engine from the transmission, which can be significant for starting and smooth operation.

While checking the throttle can be important for overall bike operation and control while riding, it is not specifically a part of the pre-start routine. This is because the throttle's primary function comes into play once the engine is running, rather than during the initial pre-start checks.