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© 2011 ICS- Blount Inc Specifications and pricing are subject to change without notice. P/N 525747 REV12Sep2012
680GC SERVICE MANUAL
23. This section covers carburetor tuning. Included in this section are basic settings, idle
speed adjustment, and complete adjustment.
The carburetor has been set at the factory for optimal performance and compliance to EPA Phase II
emissions standards. However, minor adjustments may be required in certain conditions, such as high
elevation.
NOTES:
•
These saws are equipped with an electronic speed limiter, as part of the ignition system. This will
prevent the saw from going above 12,000 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.
23. CARBURETOR TUNING