Honda Rebel 2017 Owner's Manual page 36

Starting the Engine
If you cannot start the engine:
With the throttle slightly open (about 1/8 in (3
mm), without freeplay) while starting the
engine.
About 1/8 in (3 mm), without freeplay
34
(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.93)