Honda CRF450X 2021 Manual page 33

Starting the Engine
Cold Engine Starting
Shift the transmission to neutral.
a
If the temperature is 50 °F (10 °C) or below,
b
pull the fast idle knob fully up.
With the throttle closed. Pull the clutch lever
c
all the way in, and depress the start button.
About a minute after the engine starts, push
d
the fast idle knob back all the way to fully
OFF. If idling is unstable, open the throttle
slightly.
30
(Continued)
Warm Engine Starting
Shift the transmission into neutral.
a
Pull the clutch lever and depress the start
b
button. (Do not open the throttle.)
Starting the engine excessively charged
with fuel by throttle blipping or other
reasons
Shift the transmission into neutral.
a
With the throttle fully opened, pull the clutch
b
and depress the start button for 5 seconds
to discharge excessive fuel from the engine.
Pull the clutch lever and depress the start
c
button. (Do not open the throttle.)