That's not how they where made.They were made with the carby facing inwards and you will find it doesn't have a primer.I'll take a picture of one of those cowls tomorrow and you will be able to see how they were moulded.To turn the carby around you would have to change the fitting for the carby,but I'm not to sure if it would turn around,or use one from the series 80.Why would you want to though?