diddy wanderers mcc

hey guys and girls im having problems with my yamaha xv 125 by fittin the carb back onto the bike i have a rubber pipe coming out of the frame that fits into the carb that then goes into a splitter pipe for both pistons and i have tried number of ways to fit the carb on and its started to do my head in can someone please help me out if they have done it before please tell me how you did it please cheers for your time diddy