Stihl MS 661 C-M User Manual

58 MS 661, MS 661 C-M
Check the flywheel:
– Have pole shoes turned blue?
– Install new flywheel if necessary,
b 7.7
Air gap:
– Check control unit/flywheel,
– reset if necessary, b 7.2
Check the ignition lead:
– Severe chafing?
– Spark plug boot: Holes/cracks?
– Resistance: spark plug boot to ground:
spec. 1.5 – 12 kΩ
– Check resistance of ignition lead (spark plug
boot and control unit removed)
Spec.: spec.< 10 Ω,
If necessary, install new spark plug boot and/or
control unit,
b 7.6
Check short circuit wire:
– Wire damaged?
– Connectors firmly seated?
– Check continuity, replace wiring harness if
necessary, b 7.8.1
1
3
yes
no
2
Ignition spark
spark?

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