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What Darcy said... One of the carbs is static, not to be adjusted. There is a screw between the carbs that you'd turn to match the other carb to the static carb. Then, when both are in sync you use the idle adjust knob (that you've probably fiddled with already) to raise or lower the idle to.. what... 1100 rpm? or 1000. I don't have a tac, do it by ear. Just don't set it too low, the oil pump wants a little speed at idle to provide pressure.
The idle adj knob is a black knob - no tool needed - on the left side. The carb sync adjust screw is mounted between the carbs, requires that a philips head screw bit be vertical, pointed down to turn the screw - get it? You need to devise a philips bit and a rachet or wrench to get in there. Tiny turns is all thats needed.
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