Honda ADV150 2019 Owner's Manual page 59

Starting the Engine
If you cannot start the engine:
Place the vehicle on its centre stand and
a
squeeze the rear brake lever.
Open the throttle slightly (about 3 mm,
b
without freeplay), press the start button.
About 3 mm, without freeplay
54
(Continued)
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 steps a & b again.
#
If Engine Will Not Start
(P.105)