Replacing Spark Plugs; Fuel Filter Replacement - Toro greensmaster 3100 Operator's Manual

2. Move the throttle control to the SLOW setting.
Hold the governor lever so that the throttle lever
is in the idle position (against idle stop screw)
and adjust the idle stop screw to 1400 ± 50 rpm
by turning the screw in or out. Check speed with
a tachometer.
3. Turn the idle mixture screw slowly clockwise
(lean mixture) until the engine speed just starts to
decrease. Note the position of the needle.
Now turn the idle mixture screw slowly
counterclockwise (rich mixture) until the engine
speed just starts to decrease. Note the position
of the needle.
Set the screw midway between the rich and lean
settings.
4. After the idle mixture has been adjusted, hold the
governor lever so the throttle lever is in the idle
position (against the idle stop screw) and readjust
the idle stop screw to bring speed to 1200± 50
rpm.
5. With the governor control lever in the governed
idle position (no tension on high-speed spring)
bend the governed idle spring anchor tang to
attain a governed idle speed of 1400± 50 rpm.
6. Move the throttle control to the FAST position.
Bend the high-speed spring anchor tang to attain
a high speed of 2850 ± 50 rpm.

Replacing Spark Plugs

Replace spark plugs after every 800 operating hours.
Recommended air gap is 0.030".
Correct spark plug is a Champion RC 12YC.
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 spark plugs so that foreign
matter cannot fall into the cylinder when you
remove the spark plug.
2. Pull off spark plug wires and remove the plugs
from the cylinder head.
3. Check the condition of the side electrode, center
electrode, and center electrode insulator to assure
there is no damage.
Important
A cracked, fouled, dirty or
otherwise malfunctioning spark plug must be
replaced. Do not sand blast, scrape, or clean
electrodes using a wire brush because grit may
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
electrodes at 0.030". Install a gapped spark plug
w/gasket seal, and tighten the plug to 200 in-lb.
If you don't use a torque wrench, tighten the plug
firmly.
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Fuel Filter Replacement

An in-line filter is incorporated into the fuel line
between the fuel tank and carburetor. Replace the
filter every 800 hours or sooner if fuel flow is
restricted. Be sure the arrow on the filter is pointing
away from the fuel tank.
2
1. Fuel filter
2. Hose clamps
Since gasoline is highly flammable, drain it outdoors
and make sure the engine is cool to prevent a fire
30
0.76mm
0.3 mm
Figure 35
1
Figure 36