Carburetor; Carburetor Adjustment; Speed; Service And Adjustments - Craftsman 580.326720 Owner's Manual

SERVICE AND ADJUSTMENTS
ENGINE SPEED
CAUTION: ENGINE SPEED WAS PROPERLY AD-
JUSTED AT THE FACTORY AND SHOULD RE-
QUIRE NO ADDITIONAL ADJUSTMENT. DO NOT
_k ATTEMPT TO CHANGE ENGINE SPEED. IF YOU
BEUEVE THE ENGINE IS RUNNING TOO FAST OR
TOO SLOW, TAKE YOUR GENERATOR TO
AUTHORIZED SERVICE CENTER FOR REPAIR
AND ADJUSTMENT. CHANGING ENGINE GOV-
ERNED SPEED WILL VOID ENGINE WARRANTY.
Your generator runs at a constant speed. This constant
operaUng speed is maintained by a mechanical, flyweight
type, fixed speed 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.
ADJUSTING THE CARBURETOR
The carburetor of your generator is preset at the factory.
DO NOT TAMPER WITH THE CARBURETOR, as this will
void the emission control system warranty. If your gener-
ator is used at altitudes above 5,000 feet, you should
consult with an authorizes Sears Service Facility regarding
high altitude jetting changes.
ADJUSTING VALVE CLEARANCE
After the first 50 hours of operation, you should adjust the
valve clearance in the engine.
When adjusting valve clearance, the engine should be at
room temperature and the piston should be at Top Dead
Center (TDC) of its compression stroke (both valves
closed). Correct clearance is 0.05-0.1mm. Adjust valve
clearance as follows:
• Loosen the rocker arm jam nut. Use an allen wrench
to tum the pivot ball stud while checking clearance
between the rocker arm and the valve stem with a feeler
gauge (Fig. 121.
• When valve clearance is correct, hold pivot ball stud
with allen wrench and tighten rocker arm iam nut with
a crows foot. Tighten the jam nut to 65-85 mch-pounds
torque. After tightening the jam nut, recheck valve
clearance to make sure it did not change (Fig. 13).
FEELER
0 GAUGE
',LOOSEN
JAM NUT
FIG. 11
FIG. 13
9