Chain Sprockets; Minimum Groove Depth Of Guide Bars; Depth Gauge Setting; Symbols On The Chain Saw - Stihl MS 661 C-M Instruction Manual

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
0458-759-8221-C
Saw chain
XXX
Maximum computed kickback angle without
chain brake / Maximum computed kickback
angle with chain brake
XXX / YYY
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
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