ICS 680GC - Page 22

© 2012 ICS, Blount International Inc. Specications are subject to change without notice. REV020212 F/N 545353
TITLE 680GC OPERATOR’S MANUAL
22
MAINTENANCE
SPARK PLUG
• A worn or fouled spark plug can cause a loss of power,
difficulty starting or rough idle.
• If the spark plug is dirty, clean it with a wire brush and check
the electrode gap. Readjust if necessary.
The correct gap is .020 in (0.5 mm).
• The spark plug should be replaced after 40 hours of operation
or earlier if the electrode is badly corroded.
• Always use the recommended spark plug type. Using the
wrong spark plug can severely damage the piston and cylinder
(NGK BPMR8Y).
CARBURETOR
• The function of the carburetor is to mix fuel with air.
Adjustments other than idle speed should only be made by a
servicing dealer.
• Before adjusting the engine idle speed, make sure the air
filter is clean and the engine is warmed up.
T – Idle Screw is adjusted so that the engine idles smoothly
but the clutch does not engage.
• If concrete chain saw has been running satisfactorily and
there is a gradual decrease in power and drop in RPM at
full throttle, the filter may have become dirty or saturated
with water.
T