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Adjust the Engine Governor
Speed Control
Important
Before the engine governor speed control is
adjusted, the throttle and choke controls must be adjusted
properly.
Warning
The engine must be running during the adjustment
of the engine governor speed control. Contact with
moving parts or hot surfaces may cause personal
injury.
• Ensure traction pedal is in neutral and engage
the parking brake before performing
this procedure.
• Keep hands, feet, face, and other body parts
away from rotating parts, the muffler, and other
hot surfaces.
Note: To adjust the low idle, use all the following steps. If
only the high idle is to be adjusted, proceed directly to
step 5.
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 (Fig. 18) to
attain an idle speed of 1750$50 RPM. Check the speed
with a tachometer.
1
Figure 18
Shown with Carb Adapter Removed
1. Governed idle spring
anchor tag
2
2. High speed spring anchor
tag
4. Adjust the idle stop screw until the idle speed is
increased 25 to 50 RPM over the idle speed set in step
3. Final idle speed must be 1750$100 RPM.
5. Move the throttle control to the Fast position. Bend the
high speed spring anchor tang (Fig. 18) to attain a high
speed of 3150$50 RPM.
Replacing the Spark Plugs
Replace the spark plugs after every 800 operating hours or
yearly, whichever occurs first.
Type: Champion RC12YC (or equivalent)
Air Gap: 0.030 in. (0.76 mm)
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 that 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
A cracked, fouled, dirty, or otherwise
malfunctioning spark plug must be replaced. Do not
sand-blast, scrape, or clean the electrodes by using a wire
brush because grit may eventually release from the plug
and fall into the cylinder. The result is usually a damaged
engine.
4. Set the air gap between the center and side of the
electrodes at 0.030 in. (0.76 mm) (Fig. 19). 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.
23
0.030 in.
(0.76 mm)
Figure 19
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