Honda 2 Wheelers India — engine vibrate

Address:

400072

Respected sir/ mam,

My vehicle no mh02el1950, job no 2017/jc/13242 date7/11/2017. I took the to the dealer for the 4 service. Dealer name is 21honda chandivali, sakivihar road, mumbai-400072.
After servicing there is low pickup, engine vibration (Running, idle condition) such a problem take place. 2 times i go to workshop. 1 st time i go to workshop and the mountain bolts is already tight then also he tight the bolts n said the problem is done and 2 time spark plug is cleaning and carburetor setting is done then also same issue is there always after servicing many problems happen and 1 or 3 times i have to go in the service centre then he will solve the problem so kindly look in the matter.