Homelite UT10640 Operator's Manual page 36

NOTE: If you notice a power loss with the gas-
powered tool, the exhaust port and muffler may
be blocked with carbon deposits. These deposits
may need to be removed to restore performance.
We highly recommend that only qualified service
technicians perform this service.
FUEL CAP, TANK, AND LINES
WARNING:
Check for fuel leaks. A leaking fuel cap is a fire
hazard and must be replaced immediately. If
you find any leaks, correct the problem before
using the product. Failure to do so could result
in a fire that could cause serious personal injury.
CHECKING THE FUEL FILTER
See Figure 69.
Check the fuel filter periodically. If contaminated or
damaged, have fuel filter replaced by an authorized
service center.
REPLACING THE SPARK PLUG
See Figure 70.
This engine uses a Champion RCJ4 spark plug with
0.025 in. electrode gap. Use an exact replacement
and replace every 50 hours or more frequently, if
necessary.
 Loosen the spark plug by turning it counter-
clockwise with a wrench.
 Remove the spark plug.
 Hand thread the new spark plug, turning it
clockwise. Tighten securely with wrench.
NOTE: Be careful not to cross-thread the spark
plug. Cross-threading will seriously damage the
cylinder.
CLEANING THE EXHAUST PORT,
MUFFLER, AND SPARK ARRESTOR
NOTE: Depending on the type of fuel used, the
type and amount of lubricant used, and/or your
operating conditions, 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.
MAINTENANCE
Clean the Chain Brake
The spark arrestor must be cleaned or replaced
every 50 hours or yearly to ensure proper per-
formance 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 avoid a fire hazard, never run the chain saw
without the spark arrestor in place.
Page 36 — English
Fuel Filter
WARNING:
Fig. 69
Fig. 70
Fig. 71