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SERVICE AND ADJUSTMENTS
ENGINE SPEED
CAUTION: Engine speed was properlyadjustedat
thefactory and shouldrequirenoaddittona!adjust-
menL Do not attempt to change engine speed. If
you believe the engine Is running too fast or too
slow, take your generator to an authorizedSears
Service Centerfor repair andadjustment.CHANG_
ING ENGINE GOVERNED SPEED WILL VOID EN-
GINE WARRANTY.
Th speed of the generator ismaintained byan electronically
controlled governor. DO NOT try to adjust the governed
speed setting for the following reasons:
• High engine speeds are dangerous and increase the
risk of personal injury or damage to equipment.
° Low engine speeds impose a heavy load on the engine
when sufficient engine power is not available and may
shorten engine life
° The generator will supply correct rated AC frequency
and voltage only at the proper speed Some connected
electrical devices could be damaged by incorrect fre-
quency and/or voltage
CARBURETOR
You may need to adjust the carburetor to compensate for'
differences in fuel, temperature, altitude or load Air
cleaner and air cleaner cover must be assembled to carbu-
retor when you run the engine
NOTE: DO NOT remove the air cleaner when running the
engine Operation without the air cleaner fully assembled
and the air filter installed may cause engine damage
INITIAL ADJUSTMENT
° Gently turn IDLE MIXTURE valve (Fig 20) clockwise
until it just closes DO NOT FORCE Valve may be
damaged by turning it inward too far
,, Next open IDLE MIXTURE valve 1-3/4 turns counter-
clock,vise
= This initial adjustment will permit the engine to be
started and warmed up
FINAL ADJUSTMENT
,, Start engine and let it warm up for at least five minutes
, Hold the throttle against its idle stop (idle speed) and
then turn the IDLE MIXTURE vaive slowly clockwise
1/8 turnat a time until the lean dropoff point is reached
(engine starts to miss and run erratically) Now turn the
IDLE MIXTURE valve counterc!ockwise until engine
speed begins to s!ow again (rich dropoff point)
• Turn the valve to mid point between rich and lean
tf further adjustment is needed, the main adjustment should
be made under a load condition as outlined under LOAD
ADJUSTMENT
LOAD ADJUSTMENT
• Let engine accelerate to normal governed speed.
• Apply electrical loads to the generator at or near the
unit's full rated wattage/amperage capacity.
• If the engine stops or hesitates under load, open the
IDLE MIXTURE screw 1/8 turn at a time. Test each
setting with the engine under load until engine runs
smoothly.
= If engine smokes excessively, turn the IDLE MIXTURE
SCREW clockwise 1/8 turn at a time until condition is
corrected
• After IDLE MIXTURE SCREW is properly set, move
throttle to idle speed position. If engine does not idle
smoothly turn IDLE SPEED SCREW 1/8 turn at a time
(either direction) until engine runs smoothly
NOTE: Engines operated at altitudes at about 5000 feet or
higher may require that you install a high altitude carburetor
main jet (Part No 80883) to achieve best engine perform-
ance If engine performs erratically, contact your Sears
Service Center to install the high altitude jet
SPEED
SCREW IDLE
MIXTURE
SCREW
FIG. 20