Stihl MS 661 C-M User Manual

9MS 661, MS 661 C-M
3.2 Chain Drive, Chain Brake, Chain Tensioner
Condition Cause Remedy
Chain sprocket wears rapidly Chain not properly tensioned Tension chain as specified
Wrong chain pitch Fit chain of correct pitch
Insufficient chain lubrication Check chain lubrication
Saw chain stops under full load Brake band blocked Check freedom of movement and
operation of brake band
Saw chain does not stop
immediately when brake is
activated
Chain brake spring
stretched / broken
Fit new brake spring
Brake band
stretched / worn / broken
Fit new brake band
Clutch drum worn Install new clutch drum

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