Secondary Air Supply System - Honda VT750C2 Shadow Spirit Service Manual

MAINTENANCE
Straighten bent fins with a small, flat blade screw­
driver and
remove
insects, mud or other obstruc­
tions with compressed air or low pressure water.
Replace the radiator if the air flow is restricted over
more than 20% of the radiating surface.
For radiator replacement (page 7-11
l.
Remove the steering side covers (page 3-5).
Check for any coolant leakage from the water pump,
water hoses and hose joints.
Check the radiator hoses for cracks or deterioration
and replace if necessary.
Check that all water hose bands are tight
(page 7-10).
SECONDARY AIR SUPPLY SYSTEM
• This model is equipped with a built-in secondary
air supply system. The pulse secondary air sup ­
ply system is located on the cylinder head
cov­
ers.
• The secondary air supply system introduces fil ­
tered air into exhaust gases in the exhaust port.
The secondary air is drawn into the exhaust port
whenever there is negative pressure pulse in the
exhaust system. This charged secondary air pro­
motes burning of the unburned exhaust gases
and changes a considerable amount of hydrocar­
bons and carbon monoxide into relatively harm­
less carbon dioxide and water.
.
PAIR CHECK VALVE
EXHAUST PORT
4-16