Throttle Modulator Adjustment

Disconnect solenoid valve vacuum hose from carburetor or intake manifold port. Disconnect vacuum hose from throttle modulator unit. Using a spare piece of suitable vacuum hose, temporarily connect throttle modulator directly to vacuum port. Start engine. Increase engine speed to 1500-2000 RPM. Throttle modulator should be extended. Release throttle allowing engine to decelerate. Extended modulator should hold engine speed at specified modulator activated RPM. Adjust by loosening locknut and repositioning throttle modulator to obtain specified RPM. Disconnect temporary vacuum hose from throttle modulator and hold finger over end of hose. Throttle modulator should retract and engine speed should return to normal hot (slow) idle RPM.