Honda CB300R 2019 Manual page 17

Instruments
button
SEL
button
SET
Display Check
When the ignition switch is turned to the (On) position, all the mode and digital
segments will show. If any part of these displays does not come on when it should,
have your dealer check for problems.
14
Tachometer
NOTICE
Do not operate the engine in the tachometer red zone.
Excessive engine speed can adversely affect engine life.
Tachometer red zone
(excessive engine rpm range)