All you guys cleaning your own carburetors and wanting to make sure your pilot jets are sized correctly, here are the drill sizes with the corresponding jet size. Remember, even though you can see "daylight" through a jet, it does not mean its CLEAN!!!!! You can purchase a numbered drill index with sizes 61-80. The first number is the drill number, the second is the corresponding jet size........80-33,79-35,78-40,77-45,76-50,75-53,74-56. I hope this helps.