those two screws are it. first remove the carb from the bike, then take those two top screws out (kind of hold everything together until you get both screws all of the way out, or else you might strip the holes) and pull the top off the carb. the carb slide is probably stuck. then remove the bowl on the bottom of the carb(unscrew it) and then the tiny little brass jet. just be carefull and clean all of the tiny passages and everything else well. go to mopedriders.org and look in the reapir section for a maxi service manual (its for an '83 or something, but they are all the same), itll show you everything.