27
(Fig. 25) should be touching the high speed stop.
Loosen the cable clamp and adjust the cable so that the
lever touches the stop.
2
1
Figure 25
1. Throttle stop screw 2. Idle fuel limiter cap
4. Close the idle mixture screw by gently rotating it
clockwise.
Important Do not close the screw too tight because the
screw will likely become damaged.
5. Rotate (open) the screw 1-1/8 turns counterclockwise.
6. With the cable clamp loose, turn the low speed screw on
the governor (Fig. 26) so that the throttle stop screw
(Fig. 25) on the carburetor controls the engine speed.
Adjust the carburetor throttle stop screw for 1000 RPM
idle.
1
2
4
3
Figure 26
1. Low speed screw
2. High speed stop
3. Throttle lever
4. Cable clamp
7. Adjust the governor low speed stop for 1500–1800
RPM.
8. Move the throttle control to the FAST position. Bend
the high speed stop on the governor so that the engine
runs at 3450–3550 RPM.
9. Repeat step 3, then tighten the cable clamp.
10. Lower the hood and secure the latches.
Checking and Replacing the
Spark Plugs
Since the air gap between the center and side electrodes
increases gradually during normal engine operation, change
the spark plugs at 100 hour intervals. The correct spark
plug to use in the engine is a Champion RS14 YC or
equivalent. Set the air gap at .025 in.
1. Disengage the hood latches and open the hood.
2. Clean the area around the spark plugs (Fig. 27) so that
dirt does not fall into the cylinder when the plugs are
removed.
1
Figure 27
1. Spark plug
3. Pull the wires off of the spark plugs and remove the
plugs from the cylinder head.
4. Check the condition of the center and side electrodes to
determine the operating temperature of the engine.
• Light brown insulator tip indicates correct spark plug
and heat range.
• Black or oily insulator tip indicates an excessively rich
fuel mixture, possibly caused by a dirty air cleaner
element or a carburetor that is set too rich.
• Light gray or blistered-white insulator indicates
overheating caused by a lean carburetor setting or
incorrect spark plug (heat range too high).
Important A cracked, fouled, or dirty spark plug must
be replaced. Do not sandblast, scrape, or clean the
electrodes by using a wire brush because grit may release
from the plug and enter the combustion chamber, resulting
in engine damage.
To Next Page
Loading...
Need help?
General
