Honda CBR150R 2018 Owner's Manual page 31

If you cannot start a warm engine:
Rotate the throttle 1/8 – 1/4 turn while
starting the engine.
1/8
1/4
If the engine does not start:
Open the throttle fully and press the start
a
button for 5 seconds.
Repeat the normal starting procedure.
b
If the engine starts, open the throttle slightly
c
if idling is unstable.
If the engine does not start, wait 10 seconds
d
before trying step a & b again.
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If Engine Will Not Start
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