I recently got ahold of some stock carbs that had aftermarket caps on them, but did not have the idle screws installed. After doing some searching, I found a couple forum posts and eBay auctions where people had not installed the screws and claimed their bike was running fine. My question is: Do you have to install the idle screws? If you do, what is the tap size you need for them? (I could figure that out myself, but it's easier to ask).