Starting / Stopping The Engine - Stihl MS 151 C Instruction Manual

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14.2 Disengaging the chain brake
► Pull the hand guard back towards the front
handle.
NOTICE
The chain brake must be released before open‐
ing the throttle (except during functional check‐
out) and before sawing.
Running the engine at high revs with the chain
brake engaged (chain locked) will quickly dam‐
age the engine and chain drive (clutch, chain
brake).
The chain brake is also activated by the inertia of
the front hand guard if the kickback force of the
saw is high enough: The hand guard is acceler‐
ated toward the bar nose – even if your left hand
is not behind the hand guard, e.g. during felling
cut.
The chain brake will operate only if the hand
guard has not been modified in any way.
14.3 Checking Operation of the
Chain Brake
Before starting work: Run engine at idle speed,
engage the chain brake (push hand guard
towards bar nose) and open the throttle wide for
no more than 3 seconds – the chain must not
rotate. The hand guard must be free of dirt and
easily moveable.
14.4 Chain Brake Maintenance
The chain brake is subject to (normal wear). It is
necessary to have it serviced and maintained
regularly by trained personnel. STIHL recom‐
mends that maintenance and repair work be car‐
ried out only by authorised STIHL dealers.
The following intervals must be complied with:
Full-time use:
Part-time use:
occasional use:
22
quarterly
every six months
Annually

15 Starting / Stopping the Engine

15 Starting / Stopping the
Engine
15.1 Positions of the Master Control
lever
Stop 0 – engine off – the ignition is switched off
Normal run position F – engine runs or can fire.
Starting throttle n – for starting the engine
15.2 Positions of Choke Shutter
Choke shutter closed l – for starting the engine
– if the engine is cold
– if the engine stalls during opening of throttle
after starting
– If the fuel tank was run until empty (engine
stopped).
Choke shutter open j – for starting the engine
– if engine is warm (once the engine has been
running for approx. one minute)
– when Engine Begins to Fire
– after ventilation of the combustion chamber, if
the engine was flooded
15.3 Adjust Master Control lever
To move the Master Control lever from the nor‐
mal run position F to starting throttle n, press
down the throttle trigger lockout and squeeze the
throttle trigger at the same time and hold them in
that position – now set the Master Control lever.
0458-506-0121-C