Hyster H50XM with GM 2.2L engine and Impco CA110 mixer was burning very rich, 10% carbon monoxide. We changed the dash pot on the mixer which is basically the only wear item and now the exhaust emissions are at 7%. No matter where we set the idle mixture screw or the power mixture valve the emissions stay at 7%. This is a special Hyster carburetor, Hyster # is 1368981.
Any ideas?
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