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Adjusting the Engine Speed
Important: Before adjusting the carburetor and speed
control, adjust the throttle and choke controls.
WARNING
The engine must be running during adjustment
of the carburetor and speed control. Contact with
moving parts or hot surfaces may cause personal
injury.
• Shift into neutral and engage the parking brake
before performing this procedure.
• Keep hands, feet, clothing, and other body parts
away from the cutting blades, rotating parts, the
muffler, and other hot surfaces.
1. Start the engine and let it run at half throttle for
approximately 5 minutes to warm up.
2. Move the throttle lever to the S
the idle stop screw counterclockwise until it no longer
contacts the throttle lever.
3. Bend the governed idle spring anchor tang
to attain an idle speed of 1550 to 1750 rpm. Check the
speed with a tachometer.
Shown with Air Cleaner Removed
1. Governed
idle-spring-anchor tang
4. Adjust the idle-stop screw clockwise until the idle
speed is an additional 25 to 50 rpm over the idle speed
set in step
3
5. Move the throttle lever to the F
high-speed spring-anchor tang
high speed of 2800 to 2900 rpm.
setting. Adjust
LOW
(Figure
Figure 50
2. High-speed spring-anchor
tang
position. Bend the
AST
(Figure
50) to attain a
Replacing the Spark Plugs
Service Interval: Every 800 hours
The recommended air gap is 0.76 mm (0.030 inch)
The correct spark plug to use is a Champion RC 14YC.
Note: The spark plug usually lasts a long time; however,
remove and check the plugs whenever the engine
malfunctions.
1. Clean the area around the spark plugs so foreign matter
cannot fall into the cylinder.
2. Pull the wires off of the spark plugs and remove the
plugs.
3. Check the condition of the side electrode, center
electrode, and center electrode insulator to ensure that
there is no damage.
Important: Replace a cracked, fouled, dirty, or
otherwise malfunctioning spark plug. Do not sand
blast, scrape, or clean electrodes by using a wire
brush because grit may eventually release from the
plug, fall into the cylinder, and damage the engine.
4. Set the air gap between the center and side of the
50)
electrodes at 0.76 mm (0.030 inch)
5. Install the correctly-gapped spark plug with a gasket
seal, and tighten the plug to 23 N∙m (200 in-lb). If you
do not have a torque wrench, tighten the plug firmly.
37
(Figure
51).
Figure 51
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