Jonnny, I do not know who Drill Bit is, but the tactic he is suggesting is OK for Pulling tractors, it is not OK for users. The original carbs for both SH and M Farmalls were pretty darn good. They work, and have no major issues from the early fifties until now. The passages are plugged up, and the cleaning you are giving it is correct. The use of High Ethanol% fuels will require bigger jets, But up to 15% will run fine with a little opening of the needle you are trying to get working. If you are pulling, or running E85, do as you think best. Otherwise don't drill anything. Drilling changes the flow rate of a jet in very uncontrolled ways. Use real jets with different sizes to change things. I am not down on Drill Bit, I just believe it is a harsh and difficult to control method. Jim
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