YFA solenoid Adjustment

The solenoid throttle positioner is used more often since emission control systems have become more prominent. With very lean idle mixtures, most carburetor manufacturers have had to resort to higher idle rpm’s. With the throttle plate held open to accommodate the higher idle rpm, an adverse effect sometimes occurs. This adverse effect is that the engine tends to keep running even after the ignition switch is turned off. By installing an electric solenoid throttle positioner. the dieseling or after-run condition can be more closely controlled.

Fuel Level Float Adjustment - Dry

The dry float adjustment is apreliminary fuel level adjustment only. The final adjustment must be made after the carburetor is mounted on the engine.

The following adjustment procedure is suggested:

1. Slide the solenoid in its bracket to obtain a preliminary adjustment.

?Disconnect ignition switch lead.
?Adjust to 5/16” clearance between the end of the solenoid plunger and the throttle lever.

2. Observe specified high —low rpm specifications in Specification manual.

3. Adjust throttle stop screw to obtain low rpm.
? With solenoid lead disconnected float should just touch at this point.

4. Adjust solenoid plunger to obtain high rpm.

?With solenoid ignition lead reconnected.