AIR TUBES INSTALLATION (HT-2000):
The secondary air tubes are painted different colours . The back tube is yellow, the middle on is red and the front is unpainted. Before installing, make sure the locating holes in the tubes (holes near one end of the tube) are on the left side. Insert one tube in the right side air channel and slide it to the right as much as possible. Bring the left end of the tube aligned with the ring welded to the left air channel. Move the tube to the left until the locating holes are aligned with those in the ring. Insert a cutter pin to hold in place. The air injection holes should be facing down in the front and middle tubes.
Figure 4: Air Tubes Installation
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