ADJUSTMENTS

https://youtu.be/AQq1EWFz_c0?si=Kw3Z4GPfbhrlzLaH

LATE MODEL YFA (ALUMINUM BASE)

• Most YFA carburetors would have the star type of adjusting screw. This adjustment is important and should be performed anytime the carburetor is rebuilt, or the metering rod replaced.
• Remove the carburetor. We do not recommend working on your carburetor while on the car. This would chance dropping something into the engine.
• Back out the idle screw until the throttle plate is completely closed.
• Bottom the diaphragm by pressing down on the diaphragm shaft.
• The metering rod should contact the bottom of the well.
• For models with an adjusting screw, turn the screw until the metering rod bottoms in the well.
• Turn the screw one more turn.
• For models without an adjusting screw bend the lever the metering rod is attached to until the rod bottoms out.

CUTAWAY DIAGRAMS AND IMAGES

This cutaway view should give you a better idea of what the metering rod system looks like. Disregard the TOOL as pictured. The tool has been out of production for many years. Use the instructions above.