Auxiliary Air Valve
- Remove the auxiliary air valve. Fully close the adjustment screw. Immerse the air valve bulb in boiling water and observe the valve head through the side port. Valve should move smoothly to the closed position.
- Blow through the side port. No air should pass through the valve. Allow the valve bulb to cool. The valve head should move smoothly back to open the main air passage. Replace the air valve, if the valve does not operate correctly. Reset the adjusting screw before reinstalling valve.