so i've had this sha 15.15 in a box for almost a year, is it even worth it to swap? my maxi runs like a chap but i have this extra carb sitting there doing nothing with it;s life. my real question is, they both have 68 jets in them, could i theoretically swap them with out having to test to see how it's running or is there a subtle difference that could cause my moped indigestion of the carb?