I am looking to update my wife's '00 Blast's carb.Is there a different diaphragm or stiffer spring that is available?I was also thinking that a weak link would be the plastic diaphragm cover that may flex when it gets hot.Is a Sportster carb essentially the same thing?There is a purple sticker on it with the number 27404-00Y and stamped below it is N56A A0DC.Thanks.