Vacuum Break (Automatic Choke Carburetors)
Open throttle valve so that cam follower clears highest step of fast idle cam; fully close choke valve (valve can be held closed with rubber band - see Fig 1), press inward on vacuum break plunger rod until diaphragm seated. Measure clearance between lower edge of choke valve and air horn wall using specified gauge. If clearance not correct (see Specifications ), adjust by bending vacuum break lever on choke valve as required.