Adjusting The Carburetor And Speed Control; Replacing The Spark Plugs - Toro 04356 Operator's Manual

Adjusting the Carburetor and
Speed Control
Important: Before the carburetor and speed
control are adjusted, the throttle and choke controls
must be adjusted properly.
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 five minutes to warm up.
2. Move the throttle control to the Slow setting. Adjust
the idle stop screw counterclockwise until it no
longer contacts the throttle lever.
3. Bend the governed idle spring anchor tang
(Figure 36) to attain an idle speed of 1625±50 RPM.
Check the speed with a tachometer.
Shown with Air Cleaner Removed
1. Governed idle spring
anchor tang
Figure 36
2. High speed 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 control to the Fast position. Bend
the high speed spring anchor tang (Figure 36) to
attain a high speed of 2850±50 RPM.

Replacing the Spark Plugs

Replace the spark plugs after every 800 operating hours.
The recommended air gap is 0.030 in. (0.76 mm)
The correct spark plug to use is a Champion RC 14YC.
Note: The spark plug usually lasts a long time; however,
the plug should be removed and checked whenever the
engine malfunctions.
1. Clean the area around the spark plugs so foreign
matter cannot fall into the cylinder when the spark
plug is removed.
2. Pull the spark plug wires off of the spark plugs and
remove the plugs from the cylinder head.
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
electrodes at 0.030 in. (0.76 mm) (Figure 37).
5. Install the correctly gapped spark plug with gasket
seal, and tighten the plug to 200 in-lb (23 N⋅m). If a
torque wrench is not used, tighten the plug firmly.
30
Figure 37