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13
Owner’s Manual
AST-210,AST-5000
NOTE!
If element is hard due to excessive dirt buildup, replace it.
Drain all fuel from fuel tank and pull fuel filter line from tank. Pull filter
element out of holder assembly and rinse element in warm water with
detergent.
Rinse thoroughly until all traces of detergent are eliminated. Squeeze,
do not wring, away excess water and allow element to air dry.
NOTE!
In some areas, local law requires using a resistor spark plug to suppress
ignition signals. If this machine was originally equipped with resistor spark plug, use same
type of spark plug for replacement.
Spark plug (Fig. 3-3)
The spark plug condition is influenced by:
• An incorrect carburetor setting.
• Wrong fuel mixture (too much oil in the gasoline)
• A dirty air filter.
• Hard running conditions (such as cold weather).
These factors cause deposits on the spark plug electrodes, which may result in malfunction and starting difficulties. If the
engine is low on power, difficult to start or runs poorly at idling speed, always check the spark plug first. If the spark plug
is dirty, clean it and check the electrode gap. Readjust if necessary. The correct gap is 0.6 mm. The spark plug should be
replaced after about 100 operation hours or earlier if the electrodes are badly eroded.
Muffler (Fig. 3-4)
Remove the muffler and remove excess carbon from the exhaust port or muffler inlet every 100 hours of operation.
Cylinder (Engine cooling) (Fig. 3-4B)
The engine is air cooled, and air must circulate freely around engine and over cooling fins on cylinder head to prevent
overheating.
Every 100 Operating hours, or once a year (more often if conditions require), clean fins and external surfaces of engine of
dust, dirt and oil deposits which can contribute to improper cooling.
NOTE!
Do not operate engine with engine shroud or muffler guard removed as this will cause overheating and engine damage.
Fuel Filter (Fig. 3-2B)
