settings.
5.
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 idle speed
to 1550± 50 rpm.
6.
With the governor control lever in the governed
idle position (no tension on the high-speed
spring) bend the idle spring anchor tang to attain
a governed idle speed of 1750± 50 rpm.
7.
Move the throttle control to FAST. Bend the
high speed spring anchor tang to attain a high
speed of 3150 ±50 rpm.
REPLACING SPARK PLUGS
Replace the spark plugs after every 100 operating
hours or yearly, which ever occurs first.
Recommended air gap is 0.030”.
Figure 20
Correct spark plug to use is a Champion RC 12YC.
Note: The spark plug usually lasts a long time; how-
ever, the plug should be removed and checked when-
ever the engine malfunctions.
1.
Clean the area around the spark plugs so foreign
matter cannot fall into the engine cylinder when
you remove the spark plug.
2.
Pull the spark plug wires off 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
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 by using a wire brush because grit
may eventually release from the plug and fall
into the cylinder. The result is usually a dam-
aged engine.
4.
Set air gap between the center and side of elec-
trodes at 0.030”. Install a correctly gapped
spark plug w/gasket seal, and tighten the plug
firmly.
CLEANING CYLINDER HEAD
FINS
To avoid overheating and possible engine damage,
cooling fins on the cylinder head must be kept clean.
21
Maintenance
Figure 19
1.
Governed idle spring anchor tang
2.
High-speed spring anchor tang
Shown with Air Cleaner Removed
