You do not HAVE to however it will make life easier especially if it is your first time! The screws that hold the bowls on are very soft and can strip easily...many people replace them with stainless (from
www.newspeedmaster.com )they are much harder than the stock, however I would rather replace a striped $0.40 screw than risk stripping a expensive bowl. though if your careful (very careful) you can use the stainless...as an added bonus the stainless are allen head, making the need to remove the carbs the NEXT time you jet far less ness.
so NO you do not have to...but YES I would reccomend it...just my opinion for what that's worth
