Black Max BMi1000 Operator's Manual page 20

SPARK PLUG MAINTENANCE
See Figure 14.
The spark plug must be properly gapped and free of deposits
in order to ensure proper engine operation. To check:
 Remove the spark plug cover.
 Remove the spark plug cap.
 Clean any dirt from around base of spark plug.
 Remove spark plug using spark plug wrench.
 Inspect spark plug for damage, and clean with a wire
brush before reinstalling. If insulator is cracked or chipped,
spark plug should be replaced. For replacement spark
plug, see Product Specifications earlier in this manual
or the accompanying engine manual, if applicable.
 Measure plug gap. The correct gap is 0.024−0.028 in.
(0.60-0.70 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.
NOTICE:
Be careful not to cross-thread the spark plug. Cross-
threading will seriously damage the product.
 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.
MAINTENANCE
SPARK ARRESTOR
See Figure 15.
NOTICE:
The spark arrestor on this product has not been evaluated
by the USDA Forest Service and cannot be used on U.S.
forest lands. In addition, product users must comply
with Federal, State, and local fire prevention regulations.
Check with appropriate authorities. 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 prod-
uct. Spark arrestors may be in different locations depending
on the model purchased. Contact customer service or a
qualified service center for the location of the spark arrestor
for your model.
To clean the spark arrestor:
 Remove the long screw located above the rear panel.
 Loosen the screws on the rear panel. Remove rear panel
and set aside.
 Remove the screw securing the spark arrestor in place.
 Remove the spark arrestor and gently clean using a wire
brush.
 Replace the spark arrestor and rear panel. Ensure that
all screws are tightened securely.
 Reinstall long screw and tighten securely.
DRAINING FUEL TANK/CARBURETOR
See Figures 16 - 17.
To help prevent gum deposits in the fuel system, drain the
fuel from the tank and carburetor before storing.
DRAINING THE FUEL TANK
NOTICE:
Remove all lubricant from the unit before draining the fuel
tank. Failure to do so could cause damage to the unit.
 Remove the fuel cap.
 Tilt the generator and allow fuel to drain from the fuel tank
into an approved container.
 When the fuel has drained from the tank, replace the fuel
cap.
Page 16 — English