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Carter YH Carburetor Idle Circuit

YH Idle Circuit

Turning the idle mixture screw reduces the amount of fuel.
Inspect the idle mixture screw for any grooves. Replace if any are present.
To adjust the idle mixture:
Before installing your carburetor back on the car, run in the idle mixture screw until it gently seats, then turn back out 1 1/2 turns.
Bring the vehicle up to operating temperature.
Set the idle to specifications.
Turn the idle screw in 1/4 turn and let the engine catch up.
When the RPM starts to drop, turn the screw back out 1/4 turn.
It’s OK to adjust the screw slightly to get a smooth idle.
Number one cause of a rough idle is one or more weak cylinders, or a bad electrical part such as the spark plug.
Updated on 12/10/2020

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