Honda ADV350A 2021 Owner's Manual page 67

If you cannot start the engine:
With the throttle slightly open (about 3 mm,
without freeplay), press the start button.
About 3 mm, without freeplay
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.
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If Engine Will Not Start
(P.110)
63