MAINTENANCE AND REPAIR INSTRUCTIONS
Adjust Idle Speed Screw
WARNING: This unit will need to be running during idle speed adjustment. Wear protective clothing and observe all safety instructions to prevent serious personal injury.
Also, DO NOT set unit on any surface except a clean, hard area while starting or performing any adjust- ments. Debris, such as gravel, sand, dust, grass, etc., could be thrown by the blower tube and damage property or cause serious injury to bystanders or operator.
If, after checking the fuel and cleaning the air filter, the engine still will not idle, adjust the idle speed screw as follows:
1.Start the engine and let it run at a high idle for a minute to warm up. Refer to Starting/Stopping Instructions.
2.Move the throttle control to the idle position ( ) and let the engine idle. If the engine stops, insert a small phillips screwdriver in between the Air Filter Cover and the Engine Cover (Fig. 32). Turn the idle speed screw in, clockwise, 1/8 of a turn at a time (as needed) until the engine idles smoothly.
Checking the fuel, cleaning the air filter, and adjusting the idle speed should solve most engine problems. If not and all of the following are true:
•the engine will not idle
•the engine hesitates or stalls on acceleration
•there is a loss of engine power
Have the carburetor adjusted by a qualified service dealer.
ROCKER ARM CLEARANCE
1.Remove the 2 handle screws with flat blade or T20 torx head screwdriver, while holding the nuts with 3/8” nut driver (Fig. 33).
Remove
Screws
Fig. 33
2.Remove top bolt located near starter rope handle with tools mentioned in step 1 (Fig. 33).
3.Loosen screw located near top of door hinge with same tools mentioned in step 1.
4.Open vacuum door, prop open with hand.
5.Remove handle.
6.Remove the six (6) screws on the back of the engine cover with a
View Of The Rear Engine Cover
Remove | Remove |
Screws | Screws |
Fig. 34
7.Disconnect the spark plug wire.
8.Clean dirt from around the spark plug. Remove the spark plug from the cylinder head by turning a 5/8 in. socket counterclockwise.
9.Remove the engine cover (Fig. 34).
10.Clean dirt from around the
rocker arm cover. Remove | Rocker | ||
the screw holding the rocker | Arm | ||
Cover | |||
arm cover with a large flat | |||
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blade screwdriver or Torx T- |
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25 bit (Fig. 35). Remove the |
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rocker arm cover and gasket. Spark | |||
11. Pull the starter rope slowly to | Plug | ||
bring the piston to the top of | Hole | ||
its travel (known as top dead |
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center). Check that: |
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• The piston is at the top of |
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its travel while looking in the |
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spark plug hole (Fig. 36). | Fig. 35 | ||
Rocker Arms | INTAKE | Adjusting Nuts | |
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EXHAUST
Feeler Gauge
Spark Plug
Hole
Fig. 36
•Both rocker arms move freely, and both valves are closed. If these statements are not true, repeat this step.
12.Slide the feeler gauge between the rocker arm and the valve return spring. Measure the clearance between the valve stem and rocker arm (Fig. 36 & 37). Measure both the intake and exhaust valves.
Adjusting Nut
Rocker Arm
Feeler Gauge
Valve Stem
Fig. 37
The recommended clearance for both intake and exhaust is .003
13