So , i had this thing for couple of months and it happens not so often but the bike was serviced about a week ago. Basically the bike stays overnight at my workplace car park , i warm it up and when i open the throttle i get like hit at the back wheel. I dont know how to describe it more looks like to me that something jumps into something too fast around the engine like belt jumps or w/e. Then if i ride till the corner and stop and then move on it will happen again. After riding for about 1-2 minutes it doesnt happen , for some reason it only happens when the bike stays at my workplace car park during my shift , never happened before when i was going to work.