For preliminary setting to warm up engine, turn idle mixture screw on each carburetor 3 turns out from lightly seated position. With engine idling at normal operating temperature with choke valve wide open and fast idle not operating, set automatic transmission to Drive. Adjust idle speed screw on each carburetor for correct hot engine idle speed, adjust idle mixture screw on each primary carburetor (turn in) until engine drops off 20-30 RPM from maximum RPM point, then turn each screw out 1/4 turn. Recheck the idle speed.
Idle speed
| Automatic Trans | Manual Trans | |
|---|---|---|
| 95 & 110 HP | 600 RPM trans in drive. | 700 RPM |
| 140 HP | 550 RPM trans in drive. | 650 |
Fast Idle
Make this adjustment after final idle mixture and RPM have been made. Stop the engine and place throttle lever tang on 2nd highest step of fast idle cam. Check clearance between end of idle speed screw and throttle lever. If clearance is not correct, adjust by bending throttle lever tang as necessary.
Adjusting off vehicle
Position idle speed screw as follows: With throttle lever in closed position, turn idle speed screw in until firm drag secured on paper strip placed between screw and throttle lever, then turn idle speed screw in an additional 1 1/2 turns. With idle speed in this position, check fast idle as above.
Back out the idle speed screw until the throttle valve is completely closed, then bend pump rod as necessary to align index mark on upper pump lever with sharp edge of air horn casting.
Close throttle valve to the point where vent valve just begins to open. At this point, measure throttle valve opening by inserting gauge of correct size between valve and bore directly opposite idle mixture screw. If throttle opening not correct, bend tang on throttle lever as required. Be careful not to bend vent valve spring arm.
Press diaphragm plunger inward until seated, close choke valve to point where connecting link is at end of slot in choke lever. Check choke valve opening by inserting gauge of correct size between lower edge of valve and air horn wall. Adjust by bending connecting link at the angle as shown.
FLOAT LEVEL