Stihl MS 661 C-M Instruction Manual

0458-759-8221-C
46
English 17 Adjusting the Carburetor
Stopping the Engine
► Start the engine, @ 14.
► Move the Master Control Lever to position .
The engine should stop and the Master Control Lever
should spring back to position when released.
► If the engine does not stop, move the Master Control
Lever to position .
The engine will stop.
► Take the chain saw to an authorized STIHL servicing
dealer to be repaired before use.
16.3 Testing Chain Lubrication
WARNING
Never operate your saw without bar and chain lubrication. If
the chain runs dry, the cutting attachment will be damaged
beyond repair within a very short time. A damaged chain
may break, resulting in severe or fatal personal injury.
Always check chain lubrication and the oil level in the tank
before starting work and periodically during work.
To confirm that the chain oil is flowing properly:
► Start the engine, @ 14.
► Disengage the chain brake, @ 12.2.
► Point the guide bar toward a bright surface.
► Accelerate the engine.
The chain should throw off a small amount of oil.
If the chain oil cannot be seen, check the oil level and refill
the tank as necessary.
► Test the chain lubrication again.
► If chain oil is still not visible, the lubrication mechanism is
not functioning. Take the saw to an authorized STIHL
servicing dealer to be repaired before use.
17.1 STIHL M-Tronic Engine Management System
The STIHL M-Tronic engine management system
electronically controls the ignition timing and fuel metering in
any operating condition, factoring in altitude and fuel quality.
This system provides optimum performance, whether you
are just starting to work or resuming after a break. Manual
carburetor adjustments are no longer required. The
carburetor does not have adjusting screws.
17.2 Calibrating the Chain Saw
WARNING
Before disengaging the chain brake and accelerating the
engine, position the chain saw in such a way that all parts of
your body are clear of the cutting attachment, @ 5.6.3.
The chain saw adjusts itself automatically for optimum
performance during operation. Calibrating enables the saw
to be adjusted faster for optimum performance.
► If the outside temperature is below 14 °F (-- 10 °C) or the
engine is cold, warm up the engine by opening and closing
the throttle for about 1 minute.
► Move the Master Control lever to position .
► Engage the chain brake, @ 12.1.
17 Adjusting the Carburetor
1
min
AB C
s> 30 s30-60 s
0000-GXX-3825-A0

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