16
CLEANING THE SPARK ARREST-
ING SCREEN
Cleaning is required every 25 hours ofop-
eration or annually,w hichever comes first.
1. Loosen and remove the nut from the ex-
haust outlet cover.
2. Remove the exhaust oulet cover.
3. Remove spark arresting sc reen. Handle
screen carefully to prevent damage.
4. Clean the spark arresting s creen gently
with a wire brush. Replace screen if
breaks are found.
5. Replace any broken or crack edmuffler
parts.
6. Reinstall spark arresting screen, exhaust
outletc over, and nut. Tighten nut securely.
REPLACE SPARKPLUG
The spark plug should be replaced each
year to ensure the engine starts easier and
runs better. Ignition timing is fixed and non-
adjustable.
1. Loosen 3 screws on cy linder cover.
2. Remove the cylinder cover.
3. Pull off the spark plug boot.
4. Remove spark plug from cylinder and
discard.
5. Replace with Champion RCJ--7Y spark
plugand tighten sec urely with a 3/4inch
(19mm) s ocket wrench. Spark plug gap
should be 0.025 inch (0,6 mm).
6. Reinstall the spark plug boot.
7. Reinstall the c ylinder cover and 3
screws. Tighten securely.
Spark
Plug
Cylinder
Cover
Spark
Plug Boot
REPLACE FUEL FILTER
Toreplace fuel filter, drain y our unit by run-
ning it dry of fuel. Remove fuel cap and its
connected retainer from tank. Pull filter from
tank and remove from line. Replace and re-
assemble.
CHAIN ADJUSTMENT
See CHAIN TENSION in ASSEMBLY sec-
tion.
CHAIN SHARPENING
WARNING: Improper chains harpen-
ing techniques and/or depth gauge mainte-
nance will increase the chance of kick back
which can result in serious injury.
WARNING: Wear pr otective gloves
when handling chain. The chain is sharp and
can cut you even when it is not moving.
Conditions which indicate the need for c hain
sharpening:
SReduction in size of wood chips. The siz e
ofthe wood chip will dec rease as the chain
gets duller until it becomes more like a
powder than a chip. Note that dead or
rotted wood will not produce a good chip.
SSaw cuts to one side or at an angle.
SSaw has to be forced through the cut.
Toolsrequired:
S5/32 inch (4 mm) diameter round file and
file holder
SFlat file
SDepth gauge tool
TO SHARPEN CHAIN:
1. Move ON/STOP switch to the STOP
position.
2. Check chain for proper tension. Adjust
chain tension if necessary. See CHAIN
TENSION section.
3. Sharpen cutters.
SToshar pen the cutters, position the
file holder level (90˚) so that it rests
on the top edges of the cutter and
depthgauge.
NOTE: Thec hain has both left and
right hand cutters.
Depth Gauge
File
File Holder
Cutter 90˚
SAlignthe 30˚file holder marks paral-
lelwith the bar and to the center of the
chain.
Cutter
Cutter
30˚
File Holder Line
SSharpen cutters on one side of the
chain first. File from the inside of each
cutter to the outside. Then, turn the
chain saw around and repeat the pro-
cess for the other side of the chain.
SFileon the forward s troke only. Use 2
or 3s trokes per cutting edge.
SKeep all cutters the same length
when filing.
SFile enough to remove any damage
to cutting edges (side plate and top
plate ofc utter).
A
llC utters
Same Length
Remo
v
eD amage
TopPlate
Side Plate