watch out for miss diagnosis if it has been idling after coming off choke
crank case dilution comes into play (residue fuel in the crank case)
it needs to be ridden to operational temp, then give it a chance in high revs to clear itself then diagnosis can start, using plug drop technic (speaking of spark plug heat range also comes into play) as well as your own sense of what right, if not on a dyno (ive not used dyno's still got hole shot bikes)
Old school but works