Honda CB900F 919 (2001) [40/432] Hydroca

Honda CB900F 919 (2001) [40/432] Hydroca
GENERAL INFORMATION
EXHAUST EMISSION CONTROL SYSTEM (SECONDARY AIR SUPPLY SYSTEM)
The exh
aust
e
missio
n control system is
composed
of
a lean
fue
l inj
ectio
n setting,
and
no
adj
ust
me
nts sho
uld
be
mad
e
except
idle speed a
dju
stm
ent
w ith the throttle st
op
screw. The
exha
ust emission control system is se
par
ate fr
om
the crankcase
emi
s-
sion control system .
The
exhaust
emission
control
system
con
sists of a
secondary
air
supply
system
that
introduces
filter
ed air
into
th e exhaust
gases in the exhaust port. Fresh air is drawn
int
o
the
exhaust
port
by the function
of
th e PAIR (Pulse Secon
dar
y A
ir
Inje
ction
)
control valve.
This charge of fresh
air
pr
om
otes burning of the
unburn
ed exha ust gases and changes a conside
rable
amo
unt of
hydrocar
-
bons and carbo n
mo
n
ox
ide
into relativ
ely
h
arm
less c
arb
on d
iox
ide and
water
vapor.
The reed valve
prevents
re
ver
se air
flow
through
the
sys
tem.
The PAIR control
valv
e is operated by
the
sole
noi
d
valve
. The
solen
oid
valve is contr
olled
by the PGM-FI unit, and the fresh
air
passage is opened/
closed
acc
or
ding
to
the
r
unning
condition
IECT/IATfTP/MAP sensor and
engi
ne rev
olut
ion).
No
adjustment
s to
the
second
ary
air
suppl
y
system
shoul
d be
made
, although per
iod
ic inspe
ctio
n of
the
components
is re
commended
.
PAIRCHECKVALVE
E
XHAUST
PORT
THROTTLE BODY
<.
AIR CLEANER HOUSING
~
FRESHAIR
..
EX
HAUST
GAS
1-36

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