Stihl MS 661 C-M Instruction Manual

0458-759-8221-C
61
English 24 Specifications
– Recommended spark plugs: Bosch WSR 4 F by STIHL
– Spark plug electrode gap: 0.02 in. (0.5 mm)
– Weight without fuel, oil, guide bar or saw chain:
– MS 661 C-M: 16.5 lbs. (7.5 kg)
– MS 661 C-M R with wrap-around handle:
16.8 lbs. (7.6 kg)
– Maximum fuel tank volume: 28.7 oz. (0.85 l)
– Maximum oil tank volume: 13.5 oz. (0.4 l)
Do not use BIA or TCW rated (2-cycle water cooled) mix oils
or other mix oils that state they are for use in both water
cooled and air cooled engines (e.g., outboard motors,
snowmobiles, chain saws, mopeds, etc.).
24.3 Chain Sprockets
The following chain sprockets are available for this model
chain saw:
– 7-tooth for 3/8" pitch
24.4 Minimum Groove Depth of Guide Bars
The minimum groove depth of a guide bar depends on the
pitch of the guide bar.
– Minimum groove depth for 3/8" pitch guide bars: 0.236 in.
(6 mm)
24.5 Depth Gauge Setting
The depth gauge setting of a saw chain depends on the pitch
of the chain.
– Depth gauge setting for 3/8" pitch chains: 0.026 in.
(0.65 mm)
24.6 Symbols on the Chain Saw
Maximum guide bar length
XXX
Saw chain
Maximum computed kickback angle without
chain brake / Maximum computed kickback
angle with chain brake
Engage and disengage the chain brake.
Fuel Tank
Chain Oil Tank
Direction of saw chain rotation
Oil Flow Adjusting Screw
Turn clockwise to tension the saw chain
Shutter configuration for winter operation
Shutter configuration for summer operation
Decompression Valve
Handle Heating Switch
Position of the Master Control Lever: Engine is shut
off
XXX
XXX / YYY

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