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Home >> Oldsmobile >> 1989 >> Custom Cruiser >> Repair and Diagnosis >> Engine Performance >> System >> Carburetor - ROCHESTER E4MC 4-Bbl >> Adjustments >> Air Valve Spring

Air Valve Spring

  1. Loosen shaft lock screw using Allen wrench. Rotate spring fulcrum pin counterclockwise until throttle valves open. See Fig 1 .
  2. Rotate spring fulcrum pin clockwise until throttle valves close. Then rotate spring fulcrum pin proper amount of revolutions. See CARBURETOR ADJUSTMENT SPECIFICATIONS table.
  3. Hold spring fulcrum pin and tighten lock screw. Apply a light coat of grease to spring contact area.
Fig 1: Adjusting Air Valve Spring
G54289Courtesy of GENERAL MOTORS CORP.
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