try mixture adjustment, timing check (all the stuff which desi mechanics call tuning) before having the carb opened. it can turn into a nuisance if an inexperienced person tries to service it. in my case (margalla with a g13ba 1298cc) the carb was opened three times and in the end the guys at suzuki sethi motors got it right. they replaced the plunger, vacum hoses, and the butterfly valve bushes. and in the end they adjusted the mixture with a gas analyzer.
opening the carb should be done as last resort if all else fails. and do your homework in finding a good place for that, warna be prepared for ultimate khawari