Throttle Modulator: Servicing
The decel valve calibration is preset at time of manufacture and normally does not require adjustment. To check and adjust, if necessary, proceed as follows:
With engine not running and curb idle speed previously set, position throttle lever against curb idle adjusting screw. Measure clearance between the throttle modulating diaphragm plunger and throttle lever. It should be 1/16". Adjust by loosening the jamnut and turning the diaphragm assembly.