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ADJUSTMENTS
CARBURETOR,
GASOLINE.-
The carburetor should require no, servicing other
than keeping it clean and free ofsediIitent".
When cleaning jets and
passages, use compressed air or a, £::\.ne, soft copper wire.
Be sure that
all gaskets are in their proper place when reassembling.
Changes in the type of fuel used, or in operating "conditions may neces
sitate a readjustment of the carburetor.
The main jet is not adjustable
and its size has been selected to give the best performiU1ce., The idle
adjustment needle should be adjusted to give the SIllOothest operation at
no load.
Turn the idle adjustment needle out, counterclockwise"until
the engine begins to misfire, then turn the needle in, clockwise, 1mtil
the engine runs smoothly.
Aujust, the throttle lever stop screw sO,that
there is 1/3211 space between the screw end and the throttle stop "when
the plant is operating at no load.
CARBURETOR,
GAS
OR VAPOR.- A change
in
the BTU rat.ing of the fuel used
will probably necessitate ,readjusting the knurled head gas adjul>tment
valve at the bottom of the carburetor.
With a .full10ad on the plant,
turn the adjusting valve in (clockwise) until the voltage as shown on
the AC voltmeter drQps noticeably, or the engine begins to lose speed.
Turn the screw slowly out (counterclockwise) until the voltage rises
to normal and the engine runs" SIllOothly.
If it is necessary to open the
adjustment much beyond the point where normal voltage is attained in
order to obtain smooth operation, a readjustment of the governor may be
necessary.
Check the operationa£ various loads.
There is no idle
adju"stment necessary for gas or Butane-Propane vapor operation except
to see that the throttle lever stop screw is adjusted to
1/32"
clear
ance between the screw end and the throttle stop with the plant oper
ating at no load.
ELECrBlC
CHOKE.- The choke was adjusted at the factory to operate at a
tsmperature of 70
0
F. or 2]'oC.
Inex:trsmely cold temperatures, the choke
may close so tightly that
i t
will cause overchoking.
In extremely high
tsmperatures a reverse situation may occur.
To readjust this type of
choke to function properly in very cold tetnperatures,loosenthe choke
thermostat housing lockscrew and tUl'l') the thermostat housing slightly to ,
the left (counterclockwise)
~
To readjust the chQke£or very high tem
peratures turn the thermostat housing to the right (clockwise).
Be sure
to tighten the lockscrew after making the adjustment.
SISSON CHOKE.- Some plants are equipped with the Sisson choke control
mounted on the exhaust manifold.
Thil;l type choke control should not
require seasonal adjustments, but :!!\ay be ,readjusted in the following
,
,
manner.
Turn the shaft of the contr6Ltothe;position where a 3/32
11
I "'
diameter rod or nail may be pass e d,'d!?wn,th,rol1$hthe hole in the end of
the shaft opposite the lever..EI1ga,ge
~Ii<?"
xYo.
or nail in the notch in
the mounting flange of the
control",:,'4o.6~eri'the
lever clamp, screw just
enough to allow the lever to be turn'ed'slightly.
To adjust the choke
for a leaner mixture, push the'leverdoVmward.
To adjust the choke for
a richer mixture, pull the lever upward. ,Retighten the lever clamp
screw, and remove the rod from the h9lein the shaft".
Check to sea
that there is no binding Qr sticking action.
17
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