Stihl MS 661 C-M Instruction Manual

0458-759-8221-C
9
English 5 IMPORTANT SAFETY INSTRUCTIONS
5.5 Fueling Instructions
Fuel
WARNING
￭ Gasoline and its vapors are extremely flammable. Your
STIHL chain saw uses an oil-gasoline mixture for fuel. If
spilled and ignited by a spark or other ignition source, it
can cause fire and serious burn injury or property damage.
Pick a Safe Location for Fueling
WARNING
￭ To reduce the risk of fire and explosion while fueling:
Allow the Saw to Cool Before Removing the Fuel Cap
WARNING
￭ Gasoline vapor pressure may build up inside the fuel tank.
The amount of pressure depends on a number of factors,
such as the fuel used, altitude, and temperature. To
reduce the risk of burns and other personal injury from
escaping gas, vapor and fumes:
– Always shut off the engine and allow it to cool before
removing the fuel cap.
￭ The engine is air cooled. When it is shut off, cooling air is
no longer drawn across the cylinder and engine
temperatures will rise for several minutes before starting
to cool. In hot environments, cooling will take longer. To
reduce the risk of burns and other personal injury from
escaping gas vapor and fumes:
– Allow the chain saw to cool. If you need to refuel
before completing a job, turn off the machine and
allow the engine to cool before opening the fuel tank.
Fuel Spraying or "Geysering"
WARNING
￭ Removing the cap on a pressurized fuel tank can result in
gasoline, vapors and fumes being forcefully sprayed out
from the fuel tank in all directions. The escaping gasoline,
vapors or fumes can cause serious personal injury,
including fire and burn injury, or property damage.
￭ Sometimes also referred to as “fuel geysering,” fuel
spraying is an expulsion of fuel, vapors and fumes which
can occur in hot conditions, or when the engine is hot, and
the tank is opened without allowing the saw to cool
adequately. It is more likely to occur when the fuel tank is
half full or more.
￭ Pressure is caused by fuel and heat and can occur even if
the engine has not been running. When gasoline in the
fuel tank is heated (by ambient temperatures, heat from
the engine, or other sources), vapor pressure will increase
inside the fuel tank.
– Use extreme caution when handling
gasoline or fuel mix.
– Do not smoke or bring any fire or flame
near the fuel or the chain saw.
– Note that combustible fuel vapor may
escape from the fuel system.
– Fuel your chain saw in a well-ventilated
area, outdoors away from flames, pilot
lights, heaters, electric motors, and other
sources of ignition. Vapors can be
ignited by a spark or flame many feet
away.
– Select bare ground for fueling and move
at least 10 ft. (3 m) from the fueling spot
before starting the engine.
– Wipe off any spilled fuel before starting
your chain saw.
– Take care not to get fuel on your
clothing. If this happens, change your
clothing immediately.

Stihl MS 661 C-M Specifications

General

Idle speed	- RPM
Motor type	2-stroke motor
Chain pitch	3/8 \
Blade length	800 mm
Product color	Black, Grey, Orange
Automatic oiling	Yes
Engine displacement	91.1 cm³
Power source	Gasoline
Sound power level	118 dB
Vibration emission	6.9 m/s²
Sound pressure level	105 dB

Weight and Dimensions

Weight	7400 g