2.
3.
4.
Install the idle and main adjustment screws and
turn
in
until lightly seated. For preliminary set-
tings, turn the idle screw out
1
(&
1/4)
turn and the
main screw out
2-1/2
(f1/4)
turns.
-1
Forcing the mixture adlustment
screws tight will damage the
needle and seaf. Turn in only until tension
is
felt.
Join the upper and lower sections of the carbure-
tor and install bowl plug and washer.
When thecarburetor is installed on set, make final
SECONDARY
VALVE
adjustments
to
mixture screws as specified in
Carburetor Mixture Screw Adjustments in this
SECONDARY
DIAPHRAGM
-2
section.
Regulator
A two stage regulator (see Figure
6-28)
is used to
deliver vaporized
LP
gas fuel to the carburetor. The
primary stage of the regulator receives
LP
gas at
container pressure and reduces itto the low pressure
required for set operation. The secondary stage of
the regulator restricts fuel flow through the regulator
until vacuum from the engine creates a demand for
fuel. Fuel flows through the regulator only when the
engine is cranking or operating and stops flowing
when the engine is stopped.
FS-1598
FIGURE
6-28.
LP
GAS REGULATOR
The regulator will normally require very little atten-
tion if the set is used on a regular basis and operated
on clean high quality fuel. Most regular malfunctions
can be traced to the following two sources:
PRIMARY
--*
,@
e
o
e
VALVE
0
9--
-
&-
DIAPHRAGM
PRIMARY
XFS-1600
FIGURE
6-29.
REGULATOR ASSEMBLY
A regulator that has been operated and then stored
for any length
of
time may require rebuilding or
replacement. Diaphragms and gaskets tend to dry,
shrink, and harden
as
the lighter petroleum ends
evaporate. Use the test procedure specified in the
Regulator Test section to check regulator operation
and then rebuild or replace as required. Repair kits
include detailed and illustrated installation instruct-
ions.
A
regulator that has granules of foreign matter
embedded on the secondary seat may cause incon-
sistent starting or idling. These granules are seldom
the result
of
insufficient filtration. The foreign matter
Hardened diaphragms and seats due to extended
periods of non-operation.
.
Dirt or foreign matter embedded on valves and
valve seats.
6-23
Redistribution or publication of this document
by any means, is strictly prohibited.
Redistribution or publication of this document
by any means, is strictly prohibited.
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