Idle & Mixture Adjustments (B20B Engine)

Remove air cleaner and check that oil in damper chambers is within 1/4" of the upper edge. If necessary, fill with Automatic Transmission Fluid, Type "A".

1. Carry out basic setting of fuel jets. Lift air valve and screw in adjusting screw so that upper edge of fuel jet comes level with bridge. Then lower jet by turning adjusting screw 21/2 turns clockwise, if temperature is 68°F. If temperature is higher or lower than 68°F, turn screw less than 21/2 or more than 2 1/2 turns.
2. Connect tachometer and CO meter, run engine at 1500 RPM until thermostat opens. Adjust engine speed to 800 RPM, 700 RPM if equipped with automatic transmission.
   NOTE: Use a suitable carburetor synchronizer and balance air intake of each carburetor.
3. Screw in adjusting screws until CO reading is 2.5%. Adjust equally for both carburetors. Adjust link rods. With control against its stop on manifold bracket, link rods should be adjusted until there is a clearance of about 004" between lever and flange of primary throttle spindle.
4. Adjust hot start valve so that with control rods pressed down to bottom position, clearance between rod and adjusting screw should be a maximum of 0.04".