Air Induction System; Air Injection; Air Cut-Off Valve - Yamaha XF50W Service Manual

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AIR INDUCTION SYSTEM

EAS00507
AIR INDUCTION SYSTEM

AIR INJECTION

The air induction system burns unburned ex-
haust gases by injecting fresh air (secondary
air) into the exhaust pipe reducing the emission
of hydrocarbons.
When there is negative pressure at the exhaust
port, the reed valve opens, allowing secondary
air to flow into the exhaust port. The resuired
temperature for burning the unburned exhaust
gases is approximately 600 to 700 °C (1,112 to
1,292 °F)
EAS00917

AIR CUT-OFF VALVE

The air cut-off valve prevents air backflow from
the exhaust pipe to the air filter.
A From the air filter
B To the exhaust pipe ass'y
7-35
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