1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 364Get this manual

1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 364

Idle Fuel Adjusting Needle ,) Fir t, set one of the idle adjusting needles for highe st steady manifold vacuum readin gIf
ADJUSTMENT 1Automatic choke is set accura'tely at facto ry to give Figure 18Adjusting Idle Fuel Mixture 3tart engine and
allow operating temperature to reach normal4After engine rea ches normal operating temperatureadjust idl speed screw to idle
engine at spe ified RPM best possi ble ll-weath er operationTo return choke to ori inal etting, line up index mark with proper
specification2If, for some reasonri cher or leaner mixture during warm-up period is desired, it can be obtained by rotatin