California DMV Motorcycle Knowledge Test (M1)Hazard Avoidance and Emergency ManeuversHard
You are riding your motorcycle and notice the engine suddenly revs uncontrollably, but your throttle is not stuck. This could indicate a carburetor or fuel injection issue, causing a 'runaway engine'. What is your immediate emergency action?
- ATurn off the ignition switch immediately.
- BPull in the clutch and apply both brakes firmly.
- CShift into a lower gear to try and slow the engine.
- DPump the throttle rapidly to try and clear the issue.
Show answer & explanationAnswer & explanation
Correct answer: A. Turn off the ignition switch immediately.
A 'runaway engine' with uncontrolled high RPMs can quickly lead to engine damage or a loss of control if the drive is engaged. The most immediate and effective way to cut power to the engine in such a scenario is to turn off the ignition switch. While pulling the clutch helps disengage the drive, the engine is still revving excessively, and firm braking alone might not be enough to control speed.
Why the other options are wrong
- B. Pulling the clutch disengages the engine from the rear wheel, but the engine is still revving dangerously high, which can cause damage and is not the primary solution to the runaway engine itself.
- C. Shifting to a lower gear would increase engine RPMs further or cause a sudden, dangerous engine braking effect.
- D. Pumping the throttle is unlikely to resolve an internal fuel system issue causing a runaway engine and could make it worse.
Runaway Engine (Not Stuck Throttle)
If your motorcycle's engine revs uncontrollably due to an internal issue (not a stuck throttle), immediately turn off the ignition switch to cut power and stop the engine.
- Engine is operating at dangerously high RPMs.
- Indicates internal fuel/carburetor issue.
- Ignition switch is the quickest way to stop the engine.
Memory trick: Engine's Gone Wild? Ignition Off, Right Now, Child!