Every Every Every
25 50 100
System/components Procedure
Before hours hours hours
Note
use after after after
fuel leaks, fuel spillage wipe out ✔
fuel tank, air filter, fuel filter inspect/clean ✔✔ replace, if necessary
idle adjusting screw
see adjusting
✔
replace carburetor
idling speed if necessary
spark plug
clean and readjust
✔
GAP : 0.65 mm
plug gap replace, if necessary
cylinder fins, intake air cooling vent clean ✔
muffler, spark arrester, cylinder exhaust port
clean ✔
throttle lever, ignition switch check operation ✔
cutting parts
replace if
✔
something’s wrong
gear case grease ✔
screws/nuts/bolts tighten/replace ✔✔not adjusting screws
debris guard make sure to attach ✔
ENGINE
TRIMMER
US-12
CHT2250
MA1
MA3
MA2
Maintenance, replacement, or repair of the emission control device and
systems may be performed by any non-road engine repair establishment or
individual.
8. Maintenance
specified by RedMax. (MA3)
• REPLACEMENT PLUG IS
CHAMPION RCJ6Y OR NGK
BPMR7A.
• Note that using any spark plug other
than those designated may result in the
engine failing to operate properly or in
the engine becoming overheated and
damaged.
• To install the spark plug, first turn the
plug until it is finger tight, then tighten it
a quarter turn more with a socket
wrench.
TIGHTENING TORQUE:
87~121 in-lbs
(9.8~13.7 N.m.)
■ MUFFLER
• Inspect periodically, the muffler for
loose fasteners, any damage or
corrosion. If any sign of exhaust
leakage is found, stop using the
machine and have it repaired
immediately.
•Note that failing to do so may result
in the engine catching on fire.
IMPORTANT
• Make sure that the engine has
stopped and is cool before
performing any service to the
machine. Contact with moving
cutting head or hot muffler may
result in a personal injury.
■ AIR FILTER
• The air filter, if clogged, will reduce the
engine performance. Check and clean
the filter element in warm, soapy water
as required. Dry completely before
installing. If the element is broken or
shrunk, replace with a new one. (MA1)
(1) Air filter
■ FUEL FILTER
• When the engine runs short of fuel
supply, check the fuel cap and the fuel
filter for blockage. (MA2)
(1) Fuel filter
■ SPARK PLUG
• Starting failure and mis-firing are often
caused by a fouled spark plug. Clean
the spark plug and check that the plug
gap is in the correct range. For a
replacement plug, use the correct type
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