Secondary Air Valve Spring Tension

Fig. 7 Secondary air valve spring tension:

Loosen air valve lock plug and allow air valve to position itself wide open. With a long screwdriver that will enter center of tool C-4152 positioned on air valve adjustment plug, turn plug counterclockwise until air valve contacts stop lightly, then turn additional turn as specified in the specifications chart. Hold plug with screwdriver and tighten lock plug securely with tool C-4152, Fig. 7. On all models, use tool C-4152-B.