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  7. Idle Mixture Screw - 16-12
Idle Mixture Screw - 16-12
Idle Mixture Screw - 16-12

Idle Mixture Screw - 16-12

Your Price: $6.95
10-32 x .9"
Part Number: 16-12
Availability: In Stock

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Carter idle mixture screw. There are multiple screws that this type of carburetor can have. Please be sure to compare the measurements. The taper is the important part to compare.

SPECS:
  • Thread: 10-32
  • Overall length: .900"
  • Shaft" .8005"
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.

CARBURETOR NUMBERS:
2299S
2299SA
2300S
2301S
2512S
2512SA
2512SB
2512SC
2513S
2513SA
2513SB
2513SC
2514S
2514SB
2514SC
2522S
2522SA
2522SB
2550S
2550SA
2620S
2621S

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