Rev matching, also known as throttle blipping, is a technique used by motorcyclists to match the engine speed (revs) with the rotational speed of the drivetrain components during downshifts. It involves momentarily increasing the engine RPM by quickly opening the throttle to smoothly engage a lower gear while maintaining a smooth and controlled deceleration.
When executing a downshift without rev matching, simply releasing the clutch can cause a sudden jerk or lurch in the drivetrain due to the difference in rotational speeds between the engine, transmission, and rear wheel. This can result in instability and reduced control.
Rev matching is primarily performed in these steps:
Approach the downshift: When preparing to downshift, gradually reduce the throttle while applying gentle brake pressure to slow down the motorcycle.
Clutch lever operation: Pull in the clutch lever to disengage the engine from the transmission. This allows you to shift to a lower gear without causing any transmission damage.
Blip the throttle: While the clutch is disengaged, quickly "blip" or open the throttle to raise the engine RPM to a level that matches the rotational speed of the drivetrain components in the lower gear. The blip should be a smooth, quick twist of the throttle, and the timing is crucial.
Downshift: While holding the throttle open for the brief blip, shift to the lower gear by pressing down on the shift lever with your foot. This engages the lower gear in the transmission.
Release the clutch: Gradually release the clutch lever while simultaneously rolling off the throttle. The smooth engagement of the clutch with the blipped throttle helps match the engine speed with the rotational speed of the drivetrain, resulting in a seamless and controlled downshift.
Rev matching allows for smoother downshifts, reducing stress on the transmission components and maintaining stability during deceleration. It also helps minimize the disruption in the motorcycle's balance and traction, particularly during spirited riding or when entering corners.
It's worth noting that rev matching is a skill that requires practice to master. With experience, riders can develop a feel for the timing and throttle control necessary to execute rev matching effectively.