ADA INSTRUMENTS GD-16 HERCULES, Operating Manual, Page: 9 / 25

9 English
CLEANING OF THE FUEL TANK AND CARBURETOR
Caution: Gasoline and its vapors are extremely flammable and explosive.
Fire or explosion can cause severe burns or death. Don’t smoke on the
worksite. Keep gasoline away from sparks, open flames, pilot lights, heat,
and other ignition sources.
1. Place the gasoline container below the carburetor. Use a funnel to avoid
spilling the fuel.
2. Remove the carburetor drain bolt and sealing washer.
3. After all the fuel has drain into the container, reinstall the drain bolt and
sealing washer. Tighten them securely.
SPARK PLUG SERVICE
Recommended spark plugs: F7RTC or other equivalents.
Caution: An incorrect spark plug can cause engine damage. Install spark
plug with correct electrode gap. Avoid thing coating on it.
1. Remove the spark plug with a spark plug wrench.
Caution: Muffler is very hot during engine running. Be careful, don’t touch
it until it gets cold.
2. Inspect the spark plug.
3. Replace it if the electrodes are worn, or if the insulator is cracked or
chipped.
4. Measure the spark plug electrode gap with a suitable gauge. The gap
should be 0.70 - 0.80 mm. Correct the gap, if necessary, by care fully bend-
ing the side electrode.
5. Install the spark plug carefully, by hand, to avoid cross-threading. Tight-
en the spark plug with a spark plug wrench.
Note : If installing a new spark plug, tighten 1/2 turn after the spark plug
seats. If reinstalling the used spark plug, tighten 1/8 - 1/4 turn after the
spark plug seats.
Caution : A loose spark plug can overheat and damage the engine. Over tight-
Carburetor
float bowl
Sealing washer
Drain bolt