Hi all i need some help i just bought myself a nc24 im having a problem with the cold start

, please give suggestions on what it could be and how to fix it , also when im riding i cant just open the accelerator and go i have to slowly increase speed could this be the carbs sucking air ? and when i try start the bike when its cold i have to cover the exhaust with my hand turn hit the stater and slowly yet surely she comes to life , help will be much appreciated

thanx