Honda RS150R 2019 Owner's Manual page 28

Starting the Engine
If the engine does not start:
Using the start button
a ! Open the throttle fully and press the start
button for 5 seconds.
Follow the normal starting procedure.
b !
! c If the engine starts with unstable idle, open
the throttle slightly.
! d If the engine does not start, wait 10 seconds,
then follow steps
24
a ! & b ! again.
Using the kickstarter
! a Turn the ignition switch to OFF.
b ! Open the throttle fully and crank the engine
several times with the kickstarter.
c ! Turn the ignition switch to ON.
d ! Follow the normal starting procedure.
! e If the engine starts with unstable idle, open
the throttle slightly.
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If Engine Will Not Start (P77)