Chapter 8: Exhaust
81
The air injector works as follows:
• Between the exhaust pulses of the engine, there
is low pressure in the exhaust.
• During these periods of low pressure, air is
drawn in to the converter through a reed valve in
the air injector. See Figure 8.5.
• This air provides the oxygen needed for the cat-
alyst to process the next power pulse.
• The reed valve also stops the exhaust from by-
passing the catalytic converter and escaping
through the air injector.
The air injector has an inlet screen. This screen acts as
a filter to keep debris from entering the converter,
should this screen become blocked, the converter will
not function properly.
Figure 8.5
Reed valve
Inlet screen
To service/replace the air injector:
1. Remove the two screws that secure the air injec-
tor using an 8mm wrench. See Figure 8.6.
2. Remove the two screws that secure the screen
cover using a #2 Phillips screw driver.
See Figure 8.7.
NOTE: If the inlet screen is blocked, it may be:
• Replaced
• Cleaned by mechanical means
• Solvent cleaned
• Burned clean using a butane or propane torch.
Figure 8.6
Remove these
screws
Figure 8.7
Screen cover
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