Black Max BM254BV Operator's Manual page 16

CLEANING THE EXHAUST PORT, MUFFLER,
AND SPARK ARRESTOR
See Figure 17.
WARNING:
Stop engine, remove spark plug boot, and allow engine
and muffler to cool before replacing the spark arrestor.
Contact with a hot muffler or engine could cause burns
or other serious personal injuries.
NOTE: Depending on the type of fuel used, the type and
amount of lubricant used, and/or your operating condi-
tions, the exhaust port, muffler, and/or spark arrestor
screen may become blocked with carbon deposits. If you
notice a power loss with your gas powered tool, you may
need to remove these deposits to restore performance. We
highly recommend that only qualified service technicians
perform this service.
The spark arrestor may need to be cleaned or replaced
after repeated use. If replacement is necessary, use part
number 638268001.
TO REPLACE THE SPARK ARRESTOR:
 Remove the five screws that hold the cover.
Note: Removing these screws requires the use of a T20
and T25 torx screwdriver.
 Remove the cover.
 Remove the two screws holding the muffler assembly in
place.
 Remove the muffler assembly and muffler gasket. It may
be necessary to work the muffler assembly free from the
muffler gasket.
 Separate the muffler cover from the muffler.
 Remove the three screws that hold the plates on the
muffler.
 Remove the spark arrestor.
 Replace the old spark arrestor with the new one.
 Assemble the muffler by reinstalling the plates
and tightening the three screws (torque to 18 in.lb
[2.03 Nm] minimum, 22 in.lb. [2.48 Nm] maximum).
 Reassemble the muffler and muffler cover and attach to
the muffler gasket with the two screws.
 Reinsert the muffler assembly and tighten two screws to
engine (torque to 60 in.lb [6.78 Nm] minimum, 80 in.lb.
[9.04 Nm] maximum).
 Reinstall the cover on the tool and fasten with the
five screws (torque to 26 in.lb [2.94 Nm] minimum,
39 in.lb. [4.41 Nm] maximum).
Note: Do not over-tighten screws.
MAINTENANCE
WARNING:
To avoid a fire hazard, never run the without the spark
arrestor in place.
VACUUM BAG
A dirty bag will reduce performance. To clean the bag, turn
it inside out and shake. Wash the bag in soapy water at
least once a year. Replacement parts available online at
www.blackmaxtools.com.
SPARK PLUG REPLACEMENT
See Figure 18.
This engine uses a RCJ6Y or RCJ4 spark plug. Use an ex-
act replacement every 25 hours or annually.
 Remove the spark plug boot.
 Loosen the spark plug by turning it counterclockwise with
a socket.
 Remove the spark plug.
 Inspect the new spark plug. The spark plug must be
properly gapped and free of deposits in order to ensure
proper engine operation. The correct gap is approximately
0.025 in. (0.64 mm). To widen gap, if necessary, carefully
bend the ground (top) electrode. To lessen gap, gently
tap ground electrode on a hard surface.
 Hand thread the new spark plug into the cylinder , turning
it clockwise.
 Tighten with a socket. (torque to 170 in.lb. [19.21 Nm]
minimum, 190 in.lb. [21.47 Nm] maximum.) Do not over-
tighten.
NOTICE:
Be careful not to cross-thread the spark plug. Cross-
threading will seriously damage the product.
STORING THE PRODUCT
 Clean all foreign material from the product. Store unit
indoors in a dry, well-ventilated area that is inaccessible
to children. Keep away from corrosive agents such as
garden chemicals, fertilizer, and de-icing salts.
 Abide by all ISO and local regulations for the safe storage
and handling of gasoline.
When storing 1 month or longer:
 Drain all fuel from tank into a container approved for
gasoline.
 Run engine until it stops.
 Place choke lever in the FULL CHOKE position.
 Pull throttle lock back to lock the throttle.
 Attempt to start the engine five (5) more times.
12 — English