Stihl MS 661 C-M, Instruction Manual

► If the air filter (3) is damaged. Install a new air

filter (3).

WARNING

■ Cleaning agent may cause irritation if it con‐

tacts the skin or eyes.

► Observe the information supplied with the

cleaning agent.

► Avoid contact with cleaning agents.

► In case of contact with the skin: Wash affec‐

ted areas with plenty of water and soap.

► In case of contact with the eyes: Rinse eyes

with plenty of water for at least 15 minutes

and seek medical advice.

► Spray the outside and inside of the air filter

(3) with STIHL special cleaner or a cleaning

agent with a pH value higher than 12.

► Allow STIHL special cleaner or cleaning agent

to act for 10 minutes.

► Use a soft brush to clean the outside of the air

filter (3).

► Rinse the outside and inside of the air filter (3)

under running water.

► Allow air filter (3) to dry in the air.

0000-GXX-5820-A0

3

1

2

► Push the air filter (3) into place by hand.

► Fit the filter cover (2).

► Rotate the filter cover lock (1) clockwise until

you hear a click.

The filter cover lock (1) is secure.

15.4

Cleaning the Spark Plug

► Shut off the engine and engage the chain

brake.

► Allow chainsaw to cool down.

2

1

0000-GXX-A379-A0

► Remove the filter cover (1).

► Pull off the spark plug boot (2).

► If area around the spark plug is dirty: Clean it

with a damp cloth.

► Unscrew the spark plug.

► Clean the spark plug with a damp cloth.

► If the spark plug is corroded: Install a new

spark plug.

2

0000-GXX-A380-A0

► Fit the spark plug and tighten it down firmly.

► Press the spark plug boot (2) firmly home.

► Fit the filter cover (1).

16 Maintenance

16.1

Maintenance Intervals

The maintenance intervals are dependent on the

environmental and operating conditions. STIHL

recommends the following maintenance inter‐

vals:
Chain brake

► Have the chain brake serviced by a STIHL

servicing dealer at the following intervals:

–

Full-time usage: every 3 months

–

Part-time usage: every 6 months

–

Occasional usage: every 12 months

After every 100 hours of operation

► Install a new spark plug.
Weekly

► Check the chain sprocket.

► Check and deburr the guide bar.

► Check and sharpen the saw chain.
Monthly

► Clean the air filter.

► Have oil tank cleaned by a STIHL servicing

dealer.

► Have fuel tank cleaned by a STIHL servicing

dealer.

► Have pickup body (filter) in fuel tank cleaned

by a STIHL servicing dealer.

Every 12 months

► Have pickup body (filter) in fuel tank replaced

by a STIHL servicing dealer.

English

16 Maintenance

24

0458-759-0121-D. VA0.A21.