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© 2012 ICS, Blount International Inc. Specifications are subject to change without notice. REV020212 F/N 549305
660GC OPERATOR’S MANUAL
7
SAFETY
IMPORTANT
THE FOLLOWING SYMBOL APPLIES TO ALL ITEMS LISTED ON THIS PAGE
A potential situation exists which, if not avoided, may result in
product or property damage.
Note: The concrete chain saw is equipped with a two-stroke engine and must always be run
using a mixture of premium gasoline and ICS
®
two-stroke engine oil, or other high quality
2-stroke oil that has been formulated for air cooled power equipment. It is important to
accurately measure the amount of oil to be mixed to ensure that correct mixture is obtained.
When mixing small amounts of fuel, even small inaccuracies can drastically affect the ratio
of the mixture.
• This engine is designed to be operated on premium unleaded gasoline.
• Use high quality, unleaded gasoline with a minimum octane rating of 90. If lower octane
gasoline is used, engine temperature will increase which will result in a piston seizure
and damage to the engine.
• Fuel mixture: 25:1 (4%) gasoline/oil mixture. Incorrect fuel mixture is the number one
cause of piston seizure.
• Use ICS
®
brand two-stroke engine oil, or other high quality 2-stroke oil that has been
formulated for air cooled power equipment.
• Never use two-stroke oil formulated for water-cooled two-cycle engines, such as
outboard motor oil.
• Never use motor oil intended for four-stroke engines.
• Use of water is required to cool bar and chain during break-in period.
ENGINE BREAK-IN
• It is very important to break-in a new engine to “seat” all moving parts, especially the
piston rings.
• To break-in the engine, run one full tank of 25:1 (4%) fuel at idle, cycling the throttle every
5 to 10 minutes to prevent loading.
• Failure to break-in an engine may result in piston seizure.
• Failure to break-in an engine at altitude will result in up to 50% loss of power output for
the first hour of operation making the initial cutting experience unsatisfactory.
• Proper chain tension, especially for first cut, is extremely important. Over-tensioning of
bar and chain, especially at altitude, could result in severe loss of power output making
initial cutting experience unsatisfactory.
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