You will nee a #77 drill to open up the idle jet. I grip the drill in a pair of small vise grips and gently rotate the jet between my fingers over the drill. Go slow, take your time the tiny drill is very fragile. You are only opening up the jet .001” or .002” Your only drilling thru the brass stop once you see the drill like in the photo. Use some carburetor cleaner and compressed air to make sure the jet is 100% clean before re-installing it
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