The power jet meters a measured amount of fuel from the float bowl and de liv ers it to the ven turi at 1/3 throttle and up. Provides optimum fuel mix ture at partial throt tle open ings. This allows you to run leaner jetting at low er RPM’s, while sup ply ing more fuel at high er RPM’s for max i mum per for mance and less chance of high RPM en gine seizure.