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Onan CCK Service Manual

Onan CCK
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Fuel
System
Satisfactory
engine
performance
is
largely
depend¬
ent
upon
correct
fuel
system
adjustments.
However,
adjustments
cannot
fully
compensate
for
low
engine
power
due
to
wear,
etc.
If
trouble
develops,
follow
an
orderly
procedure
to
determine
the
cause
before
making
any
adjustment.
The
carburetor
idle
and
main
mixture
were
set
for
maximum
efficiency
at
the
factory
and
should
nor¬
mally
not
be
disturbed.
If
adjustments
seem
neces¬
sary,
first
be
sure
the
ignition
system
is
working
properly
and
governor
sensitivity
is
properly
adjusted.
Adjusting
the
carburetor
is
a
means
of
obtaining
the
correct
fuel-to-air
mixture
for
smooth,
efficient
operation.
GASOLINE
AND
GAS-GASOLINE
CARBURETORS
CHOKELEVER
The
carburetor
has
idle
fuel
and
main
fuel
adjustment
screws
(Figure
14).
if
engine
runs
unevenly
at
half
or
full
load
due
to
faulty
carburetion,
the
main
fuel
adjustment
needs
adjusting.
If
the
carburetor
is
totally
out
of
adjustment
the
mix¬
ture
settings
given
below
should
be
used
as
a
preli¬
minary
adjustment.
Turn
the
mixture
screws
in
until
lightly
seated,
then
turn
out
the
specified
number
of
turns.
Forcing
the
mixture
adjustment
screw
tight
will
damage
the
needle
and
seat
Turn
in
only
untlf
light
tension
can
be
left.
TABLE
1.
CARBURETOR
ADJUSTMENTS
ENGINE
IDLE
MAIN
MODEL
ADJUSTMENT
ADJUSTMENT
CCK/CCKA
1
tO
1-1/4
1-1/4
to
1-1/2
CCKB
1-1/2
2
to
3
WARNING
I
T-handled
main
adjustment
screws
i
are
locked
in
position
with
a
packing
nut.
This
nut
must
be
loosened
before
adjustments
are
made
and
retightened
afterward.
Failure
to
tighten
the
packing
nut
may
resuit
In
leaking
fuel,
creating
a
serious
fire
hazard.
CCK/CCKA
DOWN
DRAFT
TYPE
IDLE
FUEL
ADJUSTMENT
21

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Onan CCK Specifications

General IconGeneral
Cylinders2
Ignition SystemBattery ignition
Fuel TypeGasoline
Cooling SystemAir-cooled
Fuel SystemCarburetor
StarterElectric
GovernorMechanical
Max RPM1800 RPM
Engine Type4-cycle
Bore and Stroke3.25 x 3.625 inches (82.55 x 92.08 mm)

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