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Carburetor Adjustment

Carburetor Adjustment. Idle Speed. Idle speed should be adjusted with the engine at operating temperature and the ignition timing set. Idle Mixture. Idle mixture is controlled by the idle mixture screws Engine should be at operating temperature Idle speed should already be adjusted

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Carburetor Adjustment

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  1. Carburetor Adjustment

  2. Idle Speed • Idle speed should be adjusted with the engine at operating temperature and the ignition timing set

  3. Idle Mixture • Idle mixture is controlled by the idle mixture screws • Engine should be at operating temperature • Idle speed should already be adjusted • Vacuum method • Adjust idle screws to obtain highest idle vacuum • Idle speed • Adjust idle screws to obtain highest idle rpm • Gas analyzer method • Adjust to obtain the highest CO2 (4-gas) • Adjust to obtain the lowest average CO and HC

  4. Float Adjustment (Holley) • Turn float level screws until fuel drips out of the check plugs

  5. Float Adjustment (Edelbrock and Quadrajet) • Carburetor must be disassembled to adjust the float level

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