15
Fuel Filter Service
Clean the fuel filter element every 20 hours.
WARNING
Improper use of solvents can result in fire or an explosion.
Clean the fuel filter in a well-ventilated area away from sources of sparks or flame,
including appliances with a pilot light. Never use gasoline or low flash point solvents to
clean the fuel filter.
Pick the grommet (1) out of the fuel tank (2), and then remove the fuel filter assembly (3) from
the fuel tank together with the grommet and the fuel tube (4) to keep dust from entering into the
fuel filter.
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Clean the fuel filter assembly in a bath of high flash-point solvent.
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Dry the fuel filter assembly before installing.
NOTE
○
If fuel does not flow better with the fuel filter cleaned, replace the fuel filter assembly with
new one.
Spark Plug Service
Clean or replace spark plug and reset gap (5) every 50 hours of operation.
WARNING
Hot engine parts can cause severe burns.
Allow engine to stop and cool before checking spark plugs or other engine
components.
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Disconnect the spark plug wire lead and remove the spark plug.
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Clean the electrodes (6) by scraping or with a wire brush to remove carbon deposits and
wetness.
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Inspect for cracked porcelain or other wear and damage. Replace the spark plug with a new
one if necessary.
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Check the spark plug gap and reset it if necessary. The gap must be between 0.6mm and
0.7mm (0.024in and 0.028in). To change the gap, bend only side-electrode, using a spark
plug tool.
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Install and tighten the spark plug to 12~17N m (1.2~1.7kgf m) then connect the spark plug
leads.
2700LK, 2700UK, 3500LK, 3500UK, 4500UK
Recommended spark plug:
NGK BPMR7A
5300UK
Recommended spark plug:
NGK BPMR8Y
Fuel Tank Cap Service
A breather passage is incorporated in the tank cap. If the breather passage is clogged, the fuel
will not flow into the carburetor, causing problems with starting or running the engine. At the
same time, make sure that the base of the breather assembly is fitted firmly into the groove
inside the tank cap as shown.