Honda CBR650R 2019 Owner's Manual page 130

Instruments, Controls, & Other Features
Ignition Cut-off System
A banking (lean angle) sensor automatically
stops the engine and fuel pump if the
motorcycle falls over. To reset the sensor, you
must turn the ignition switch to the OFF position
and back to the ON position before the engine
can be restarted.
128
Assist-slipper Clutch System
The assist-slipper clutch system helps to prevent
the rear tire from locking up when the
deceleration of your motorcycle produces a
strong engine braking effect. It also makes the
clutch lever operation feel lighter.
Use only MA classification engine oil for your
motorcycle. Using engine oil other than MA
classification oil could result in damage to the
assist-slipper clutch system.