California DMV Motorcycle Knowledge Test (M1)Motorcycle Controls and Basic ManeuversHard
A rider is having difficulty shifting gears smoothly, often experiencing a 'clunk' or jolt when changing. What is the most likely cause of this issue?
- AApplying too much rear brake during the shift.
- BNot fully engaging the clutch before shifting.
- CReleasing the throttle too slowly during an upshift.
- DShifting at too high an RPM for the current gear.
Show answer & explanationAnswer & explanation
Correct answer: B. Not fully engaging the clutch before shifting.
For a smooth gear change, the clutch must be fully disengaged to completely separate the engine from the transmission, allowing the gears to mesh without resistance. If the clutch is not fully pulled in, the transmission is still under load, causing a 'clunk' or jolt as the gears force themselves to change.
Why the other options are wrong
- A. Applying the rear brake during a shift might slightly upset balance but wouldn't directly cause a 'clunk' in the transmission.
- C. Releasing the throttle too slowly during an upshift would cause the engine to rev too high, but the 'clunk' is primarily related to clutch engagement.
- D. Shifting at too high an RPM can cause a jolt if the clutch is released too quickly, but the 'clunk' during the actual shift is often due to an engaged clutch.
Smooth Shifting
Smooth gear changes require precise coordination of clutch disengagement, throttle blip (for downshifts), and quick, firm movement of the shift lever.
- Clutch must be fully disengaged for a smooth shift.
- Throttle should be momentarily closed (upshift) or blipped (downshift).
- Shift lever movement should be quick and deliberate.
- Matching engine RPM to wheel speed is key (rev-matching).
Memory trick: Clutch in, throttle out, shift with care, no doubt.