Black Max BM903500 Manual Del Operador página 21

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 Measure plug gap. The correct gap is 0.028−0.031 in.
(0.7-0.8 mm). To widen gap, if necessary, carefully bend
the ground (top) electrode. To lessen gap, gently tap
ground electrode on a hard surface.
 Seat spark plug in position; thread in by hand to prevent
cross-threading.
 Tighten with wrench to compress washer. If spark plug
is new, use 1/2 turn to compress washer appropriate
amount. If reusing old spark plug, use 1/8 to 1/4 turn for
proper washer compression.
NOTE: An improperly tightened spark plug will become
very hot and could damage the engine.
CLEANING THE EXHAUST PORT AND
MUFFLER
Depending on the type of fuel used, the type and amount of
lubricant used, and/or your operating conditions, the exhaust
port and muffler may become blocked with carbon deposits.
If you notice a power loss with your gas-powered products,
you may need to remove these deposits to restore perfor-
mance. We highly recommend that only qualified service
technicians perform this service.
SPARK ARRESTOR
See Figure 16.
NOTICE:
This product is equipped with a spark arrestor that has
been evaluated by the USDA Forest Service; however,
product users must comply with Federal, State, and local
fire prevention regulations. Check with appropriate au-
thorities. Contact customer service or a qualified service
center to purchase a replacement spark arrestor.
The spark arrestor must be cleaned or replaced every 50
hours or yearly to ensure proper performance of your product.
Spark arrestors may be in different locations depending on
the model purchased. Please contact your nearest service
dealer for the location of the spark arrestor for your model.
To clean the spark arrestor:
 Loosen and remove the screw clamp securing the spark
arrestor.
 Remove the screen cap and spark arrestor. Gently clean
using a wire brush.
 Replace the screen cap and spark arrestor. Secure using
the screw clamp.
DRAINING FUEL TANK/CARBURETOR
See Figures 17 - 18.
To help prevent gum deposits in the fuel system, drain the
fuel from the tank and carburetor before storing.
DRAINING THE FUEL TANK
 Remove any load from the generator and stop the engine.
 Turn the fuel valve to the OFF position.
MAINTENANCE
 Push the fuel valve knob through the generator housing
and pull down slightly to gain access to the petcock.
 Remove the fuel line from the petcock by squeezing the
ends of the retaining clip and sliding the fuel line off.
 Install one end of a drain line over the petcock, and place
the other end in a fuel container large enough to catch
the fuel being drained from the tank.
 Turn the fuel valve to the ON position.
 When the fuel has drained from the tank, close the fuel
valve and reinstall fuel line securely on petcock.
 Reinstall fuel valve knob in generator housing. Push for-
ward until knob snaps securely into position.
DRAINING THE CARBURETOR
 Remove any load from the generator and stop the engine.
 Turn the fuel valve to the OFF position.
 Position a suitable container under the carburetor drain
screw to catch fuel; loosen the screw.
 Allow fuel to drain completely into container.
 Retighten drain screw.
NOTE: Consult hazardous waste management guidelines in
your area for the proper way to dispose of used fuel.
REPLACING FUEL FILTER
See Figure 19.
Occasionally the fuel filter may become clogged and need
replacing. To purchase a replacement fuel filter contact
customer service or a qualified service center.
NOTE: Fuel tank must be empty before replacing fuel filter.
Run unit until tank is empty, if needed, or inspect filter prior
to fill-up.
To replace:
 Turn the fuel valve to the OFF position.
 Remove the fuel line from both sides of the filter by
squeezing the ends of the retaining clip with pliers.
 Slide the fuel lines off.
 Replace with new fuel filter.
 Reinstall fuel lines to new fuel filter.
 Turn the fuel valve to the ON position.
TRANSPORTING
 Turn engine switch OFF ( O ).
 Turn the fuel valve to the OFF position.
 Allow 30 minutes of "cool down" time before transporting
the machine. Make sure engine and exhaust of unit are
cool.
 Do not drop or strike unit or place under heavy objects.
 If transporting in a vehicle, drain the fuel tank, close the
fuel valve and securely restrain the generator.
 Provide a plastic sheet or absorbant pad below the gen-
erator to catch any drips of fuel or oil.
Page 17 — English

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