With the engine warmed up, idle it down to 450-500 RPM. Back the screw out some then turn it in to best idle. Turning it in richens the mix, it adjusts air bleed not fuel.
If the adjustment has no effect, the idle circuit may be clogged. There is an idle jet, and 2 tiny holes in the throttle bore, right where the throttle plate closes against the bore. Important those holes are clear.
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Today's Featured Article - A Farmall Restoration Story - What's Been Done So Far - by Sean Brinston. This is a story of my first real tractor restoration. My name is Sean Brinston and I was 15 almost 16 at the time of this.My neighbour directly across the road who I had helped with hay all the time had this tractor sitiing at his house for what I thought was 6 years. Finally I got the money and courage to ask him. I phoned him and he said it was already sold, eight years ago!
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