5.6
Section 5
Fuel System and Governor
Adjusting Low Idle Speed
1. Start the engine and run at half thro le for 5 to 10
minutes to warm up. The engine must be warm
before making fi nal se ings.
2. Low Idle Speed Se ing: Place the thro le in the
idle or slow position. Set the low idle speed to
1800 RPM (+ 150 RPM) by turning the low idle
speed screw in or out. See Figure 5-7.
NOTE: The actual low idle speed depends on
the application. Refer to the equipment
manufacturer’s recommendations. The
low idle speed for basic engines is 1800
RPM (+ 150 RPM).
Idle
Speed
Screw
Figure 5-7. Carburetor Adjustments.
3. High Idle Speed Se ing: Set the high idle speed
by turning the high idle speed screw in or out.
See Figure 5-8. Do not exceed 3750 RPM.
NOTE: The high idle speed is also specifi ed by the
equipment manufacturer. Set according to
recommendations. The high idle speed for
basic engines is 3600 RPM (+ 150 RPM).
Figure 5-8. High Speed Screw.
Carburetor Servicing
If symptoms described in the carburetor
troubleshooting guide indicate a problem within the
carburetor, the following steps can be used to remove
the carburetor from the engine and provide the
necessary service.
Carburetor Removal
1. Remove the air cleaner cover, fi lter element
with precleaner, the carburetor cover mounting
screws, and hex fl ange nuts from the mounting
stud(s). See Figure 5-9.
NOTE: If the low-profi le air cleaner is installed,
remove the cover and element, remove the
two hex fl ange nuts securing the base to the
carburetor and one screw secured to the
blower housing, and remove the base.
Flange
Nuts
Screws
Nut
Nut
Air Cleaner
Cover
Gasket
Latch
Carburetor
Cover
Stud
Air Cleaner
Base
Figure 5-9. Removing Air Cleaner Assembly.
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