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  7. Rochester 2 Jet Idle Mixture Screw - 16-138
Rochester 2 Jet Idle Mixture Screw - 16-138
Rochester 2 Jet Idle Mixture Screw - 16-138

Rochester 2 Jet Idle Mixture Screw - 16-138

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Your Price: $8.95
Small Bore 10-32 x 2.055"
Part Number: 16-138
Availability: In Stock

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Rochester 2G, 2GC carburetor small bore idle mixture screw. A new spring is included. New, currently being produced.

Match with your old screw. The taper is the important part.

10 x 32, overall length: 2.055

Adjusting the Idle Mixture Screws

The idle mixture screws only affects idle. They simply control the amount of fuel and air mixture that is delivered at idle.

First run the screws in all the way until they seat, lightly. Too hard and you will damage the screw. Now back the screw out until the specified rpm is achieved. Turning the idle mixture screws clockwise (in) leans the idle mixture. Turning the idle mixture screws counter clockwise (out) richens the mixture.

Turn the mixture screws, alternating between the two in 1/4 turn at a time until the engine rpm starts to drop, then turn them back out 1/4 of a turn.

When adjusting your idle mixture screws doesn't seem to change the engine rpm much is an indication that there is something wrong and could be an indication of a needed rebuild.

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