Secondary Throttle Valve

Secondary throttle valve should start to open when primary throttle valve opens 50-54 degrees. Measure clearance between primary throttle valve and bore when secondary throttle valve starts to open. See Fig 1 .
Clearance should be within .289-.325" (7.35-8.25 mm). Adjust clearance by bending tab.

Fig 1: Checking Secondary Throttle Valve Opening Angle

Courtesy of MAZDA MOTORS CORP.