680ES OPERATOR MANUAL
39
© 2015 ICS®, Blount International Inc. Specications are subject to
change without notice. REV071315 F/N 577451
Maintenance
CARBURETOR
• The function of the carburetor is to mix fuel with air. Adjustments other than
idle speed should only be made by an authorized service center.
• Before adjusting the engine idle speed, make
sure the air lter is clean, the engine is running,
warmed up and the guidebar and chain are
assembled on the saw.
• Adjust idle screw so that the engine idles smoothly
but the clutch does not engage. If the chain begins
to spin, turn the idle screw counter-clockwise until the
chain stops.
• If saw has been running satisfactorily and there is a
gradual decrease in power and drop in RPM at full
throttle, the lter may have become dirty or wet. (See air lter section).
SPARK PLUG
• Clean the spark plug with a wire brush and check to assure the plug gap is 0.5
mm (0.020 in).
• Inspect the spark plug boot, replace if needed.
• Inspect lead wire for wear or damage. Replace if necessary (lead wire cannot
be replaced separately from ignition module).
• Replace spark plug after 40 hours of use, or if the electrode is corroded or
eroded.
• Always use a recommended spark plug (resistor type) to prevent damage to
the piston and cylinder. (NGK #BPMR8A or Champion RCJ7Y or equivalent).
IMPORTANT
STARTER RECOIL HOUSING
It is common for concrete slurry to get inside the
starter housing assembly during cutting. This can
cause starter pawls to stick and not engage when the
rope is pulled.
• After each usage, thoroughly ush the starter
housing assembly with water.
• Spray lightweight oil into the air intake slots on the
starter housing and ywheel (this will prevent the starter pawls from sticking).
• Inspect the starter cord for fraying, replace if necessary.
Carburetor idle screw
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