If it doesn't start in 3 pulls tops, there is something wrong. I have 3 and they all fire first pull. It may be spark related. The coils can be problematic from time to time. If it fires easily with carb clean, check fuel.The Mikuni carbs are finicky. I would first make sure that there are no restrictions in fuel delivery, like a plugged tank or filter. Then clean the carb. If it still doesn't, check spark.