"Up" is the choke given or "On" position for starting bike in morning
choke is moved towards Up position and bike is started than warm it
for few seconds in choke up position than move choke to down position
with choke Up bike would not run like normal it will jerk so you can notice
choke is not in the right position bike runs fine on choke down position
choke is only used to start bike from cold position and its good habbit to use choke