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  VW Parts Catalog > Carbs & Fuel System >

Weber IDF Throttle Stop Screw (Idle Speed Screw), 64625.015
Weber IDF Throttle Stop Screw (Idle Speed Screw), 64625.015
 
Weber IDF Throttle Stop Screw (Idle Speed Screw), 64625.015 is the screw which sets where the throttle plates are in their CLOSED position. Idle speed adjustments are made by turning this screw in or out, then the idle mixture is set afterward. These are often bent or grooved.

Proper idle settings are achieved by fully warming up the engine, set your ignition timing, then sync the carbs. Next adjust idle mixture, then idle speed, idle mixture, idle speed, and idle mixture. At this point you are likely not changing anything and you are done!

To set idle mixture, 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).

Note that any time you change the idle speed, carb sync, idle jet size, or ignition timing, you must re-set the idle mixture!
Price: $3.95
Item eligible for Econo/1st Class Mail shipment, min ship charge applies


: 64625.015


QTY:
Overview
 
Weber IDF Throttle Stop Screw (Idle Speed Screw), 64625.015 is the screw which sets where the throttle plates are in their CLOSED position. Idle speed adjustments are made by turning this screw in or out, then the idle mixture is set afterward. These are often bent or grooved.

Proper idle settings are achieved by fully warming up the engine, set your ignition timing, then sync the carbs. Next adjust idle mixture, then idle speed, idle mixture, idle speed, and idle mixture. At this point you are likely not changing anything and you are done!

To set idle mixture, 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).

Note that any time you change the idle speed, carb sync, idle jet size, or ignition timing, you must re-set the idle mixture!

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