On my 78 Spit with a single Z-S carb, there is an adjustment screw
with a tamper proof cap on the right side. (At least it once HAD a
tamper proof cap.) According to the manual, it is an idle control
screw. In my quest for the perfect carb adjustment that will magically
unleash 250 hp 8-) or at least pass emissions, I was wondering about
the purpose of this screw. Is it an air bleed or a gas bleed? Which
way do I turn it to lean or enrichen? Does it provide effect over
a full range of engine speed or only at idle and near idle?
TIA!
Greg Rowe
78 Spitfire
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