Honda SH300 Owner's Manual page 78

6. Be sure to keep the throttle closed locked
while warming up the engine.
7. Allow the engine to warm up before riding
(see "RIDING" page 68).
Do not "BLIP" the throttle (open and close
rapidly) as the scooter will move forward
suddenly.
Do not leave the scooter unattended while
the engine is warming up.
Snapping the throttle or fast idling for more
than about 5 minutes at normal air
temperature may cause exhaust pipe
discolouration.
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