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 - Experimental Tractors Article - by Danny Bowes (Dsl). Tractor technology appears to have nearly hit it's pinnacle of development. If you agreed with the subtitle, you are rather mistaken. Quite, actually. As a matter of fact, some of the technology experimented with over 40 years ago makes today's tractor technology seem absolutely stale by comparison. Experimentation, from the most complex assembly to the most simple and mundane component, is as an integral a part of any farm tractor's development
... [Read Article]
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