Centrifugal Governor

Amount of fuel injected is controlled by changing injection cut-off point according to engine speed and load conditions. Cut-off point is controlled by position of metering sleeve around distributor plunger.

Sleeve normally covers relief port in plunger. Uncovering port stops injection. Sleeve position is determined by centrifugal governor and accelerator linkage. Large quantity of fuel is supplied during starting, less at idle. Once engine obtains predetermined maximum RPM, fuel flow can no longer be increased.