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© 2011 ICS | Blount, Inc. Specifications and pricing are subject to change without notice. P/N 550416 REV06012011
660GC SERVICE MANUAL
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This section covers carburetor tuning. Included in this section are basic settings,
idle speed adjustment, and complete adjustment.
The carburetor on a new saw is set at the factory for optimal performance and
compliance to EPA Phase II emmissions standards. However, minor adjustments
may be required in certain conditions, such as high elevation. A replacement
carburetor is not set correctly from the factory. Use the tuning instructions in this
manual to adjust carburetor to factory-recommended settings. (DO NOT adjust
the carburetor for maximum rpm. Adjusting the carburetor for maximum rpm will
cause engine damage).
Always set the carburetor jets to factory settings
when replacement or complete rebuild becomes necessary.
NOTES:
• These saws are equipped with an electronic speed limiter, as part of the ignition
system. This will prevent the saw from going above 12,500 rpm. Attempting to
set the carburetor mixture to increase the speed or power beyond this limit may
seriously damage the engine.
• Always check the air filter, pre filter, fuel filter, and spark plug before making
carburetor tunings and clean or replace if necessary
22. CARBURETOR TUNING