Stihl MS 661 C-M User Manual

70 MS 661, MS 661 C-M
8.6.1 Engine does not start
Can engine
be started?
no
– Set the Master Control
lever to } .
Troubleshooting completed
– Check ignition (spark
plug, spark plug boot,
ignition spark), b 7.5
Ignition
spark?
– Check start detection,
(microswitch, activating
lever), b 8.5
– Check the switch unit and
clean or replace if
necessary, b 8.5
– Check start detection and
wiring harness electrically,
b 8.3.5, b 8.3.6
yes
Mechanically
in order?
Specified values
obtained?, b 8.3.6
– Look for fault in fuel
system, check engine for
leaks, b 13.11, b 13.5,
b 6.2
– Check the switch unit and
wiring harness and clean or
replace if necessary,
b 8.3.5, b 8.3.6
no
yes
no
no
Engine does not start
Can the engine be
started?
yes
no
– Check the solenoid valve,
b 8.3.4
Specified values
obtained? b 8.3.4
– Install new carburetor,
b 13.4
yes
yes
no
– Check ignition system
with aid of "Ignition System
Troubleshooting Chart",
b 7.13
yes

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