Evinrude 4906B 4HP 1969 Owner's Manual page 114

4-7 CHOKE SYSTEM SERVICE
FIRST THESE WORDS
Johnson/Evinrude
identified by the type of choke system used.
One has a manual choke; the second, a heat
and electr ic combination
third has a water choke.
tions will be given in this section for re-
moval of the three different types of choke
systems. The following section
procedures for rebuilding the carburetors.
The next section covers installation
choke systems to the carburetor.
The larger engines covered in this man-
ito
ual (25 hp~thru
electric starter motors and a generator sys-
tem. In most cases, these items must be
moved out of the way to provide clearance
for the carburetor.
only be moved and not removed.
only attaching hardware need be removed in
order to move the
clearance. Electrical
left intact. 'When working on an engine
equipped with a combination heat/ electrical
choke system, the heat tube between the
exhaust manifold and the carburetor
be re moved BEFORE the starter
be moved.
EACH carburetor
system installed. Perform one of the fol-
lowing three procedures
choke system installed on the carburetor
the engine being serviced.
carburetors may be
choke; and the
Detailed instruc-
provides
of the
hp) are equipped with
HOWEVER, they need
Therefore,
item for carburetor
connections may be
must
motor can
has only one choke
depending on the
HEA T /ELECTRIC
1- Observe the compression
the plate securing
exhaust manifold.
it back on the heat tube.
of the heat tube is another compression nut
securing the tube in the choke chamber of
the carburetor.
and slide it back on the tube.
heat tube from the engine.
2- Disconnect the fuel line at the carbu-
retor. Remove the two nuts from the inlet
manifold mounting studs and remove the
carburetor.
carburetor
in order to obtain clearance for the nuts to
be removed from the studs.
3- Observe the marks on the cover plate
and on the base. Notice the cover plate has
only one mark, but the base has several
marks. Identify
cover plate and the marks on the base to
ensure the cover plate will be installed back
into its original position.
screws securing the cover plate to the choke
base.
4- Lift the cover and gasket from the
choke base. Observe the cover has a spring
on the inside.
important role in the choke system.
heat from
of
CHOKE SYSTEM
CHOKE - REMOVAL
the heat tube to the
Loosen the nut and slide
At the other end
Loosen the compression nut
It may be necessary to shift the
slightly as the nuts are loosened
the relationship
Remove the three
This spring performs a very
the exhaust manifold
4-23
nut under
Remove the
of the
As the
moves