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  VW Parts Catalog > Carbs & Fuel System >

Weber IDF Idle Mixture Screw, 64750.003
Weber IDF Idle Mixture Screw, 64750.003
 
Weber IDF Idle Mixture Screw, 64750.003 is the small screw at the carburetor base, it micro-adjusts the pre-mixed fuel and air from the idle jet and idle air bleed. This allows you to adjust the A/F mixture ONLY AT IDLE. These are often bent or grooved.

Proper idle mixture setting is achieved by fully warming up the engine, set your ignition timing and idle speed. Turn the idle mixture screw to fastest idle speed. it's best to turn it in too far 1 bbl at a time (bottom it out lightly, idle speed will drop as you lose a cylinder), and as you turn it out the cylinder will come back, picking up idle speed. Set for fastest idle, + 1/2 turn out (richer). The extra 1/2 turn makes for a more STABLE idle (not a better one).

Any tmie you change the idle speed, carb sync, idle jet size, or ignition timing, you must re-set the idle mixture!
Price: $9.95
Item eligible for Econo/1st Class Mail shipment, min ship charge applies


: 64750.003


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Overview
 
Weber IDF Idle Mixture Screw, 64750.003 is the small screw at the carburetor base, it micro-adjusts the pre-mixed fuel and air from the idle jet and idle air bleed. This allows you to adjust the A/F mixture ONLY AT IDLE. These are often bent or grooved.

Proper idle mixture setting is achieved by fully warming up the engine, set your ignition timing and idle speed. Turn the idle mixture screw to fastest idle speed. it's best to turn it in too far 1 bbl at a time (bottom it out lightly, idle speed will drop as you lose a cylinder), and as you turn it out the cylinder will come back, picking up idle speed. Set for fastest idle, + 1/2 turn out (richer). The extra 1/2 turn makes for a more STABLE idle (not a better one).

Any tmie you change the idle speed, carb sync, idle jet size, or ignition timing, you must re-set the idle mixture!

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