© 2011 ICS | Blount, Inc. Specifications and pricing are subject to change without notice. P/N 550416 REV06012011
660GC SERVICE MANUAL
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22. CARBURETOR TUNING
22.5 Start the saw and warm up
the engine.
22.6 With a tachometer check the saw
rpm, with bar and no chain:
A Idle = 3,000 ± 500 rpm
B If the idle rpm does not fall into
this range, adjust the T screw,
clockwise
to raise RPM, counterclockwise to
lower RPM.
22.3 Using a 5/64” straight blade
screwdriver, gently turn the
adjustment screws clockwise
until completely closed.
22.4 Set the adjustment screws at
the Basic Setting:
H = 1 turns from closed
L = 1 turns from closed
The side cover must be held
tightly in place with the side
cover nuts, using a bar and
no chain. Failure to do so may
result in personal injury.