Taking Care Of The Guide Bar - Stihl MS 271 Instruction Manual

17 Taking Care of the Guide Bar

16.9 As soon as the engine runs
4
3
► Press down trigger lockout and the blip the
throttle trigger (3) – the Master Control
lever (4) moves to the run position (F) and the
engine settles down to idling speed.
► Pull the hand guard back toward the front han‐
dle.
The chain brake is now disengaged – your saw is
ready for operation.
NOTICE
Always disengage chain brake before accelerat‐
ing the engine. High revs with the chain brake
engaged (chain locked) will quickly damage the
clutch and chain brake.
16.10 At very low outside tempera‐
tures
► Allow engine to warm up at part throttle.
► Change over to winter operation if necessary –
see "Winter Operation".
16.11 Shut off the engine.
► Move the Master Control lever to the stop
position (0).
If you have moved the Master Control lever from
the starting throttle position (n) to the stop posi‐
tion (0) – depress the trigger lockout and throttle
trigger at the same time.
0458-574-8221-D
16.12 If engine does not start
If you did not move the Master Control lever from
the choke closed position (l) to the starting
throttle position (n) quickly enough after the
engine began to fire, the combustion chamber
4
may be flooded.
► Move the Master Control lever to the stop
position (0).
► Remove the spark plug – see "Spark Plug".
► Dry the spark plug.
► Crank the engine several times with the starter
to clear the combustion chamber.
► Refit the spark plug – see "Spark Plug".
► Set Master Control lever to the starting throttle
position (n) – even if the engine is cold.
► Now start the engine.
17 Taking Care of the Guide
Bar
► Turn the guide bar over – every time you
sharpen the chain and every time you replace
the chain – this helps avoid one-sided wear,
especially at the nose and underside of the
bar.
► Regularly clean the oil inlet hole (1), the oil‐
way (2) and the bar groove (3)
► Measure the groove depth – with the scale on
the filing gauge (special accessory) – in the
area used most for cutting
Chain type
Picco
Rapid
Picco
Rapid
Rapid
If groove depth is less than specified:
► Replace the guide bar
The drive link tangs will otherwise scrape along
the bottom of the groove – the cutters and tie
straps will not ride on the bar rails.
2
Chain pitch Minimum
groove
depth
1/4" P 4.0 mm
1/4" 4.0 mm
3/8" P 5.0 mm
3/8"; 0.325" 6.0 mm
0.404" 7.0 mm
English
1
3
27