Stihl HT 250, Instruction Manual

Page: 26 / 96

HT 250
English
24
If the engine does not start
Choke knob
If you did not turn the choke knob to
e
quickly enough after the engine began to
fire, the combustion chamber is flooded.
N
Turn the choke knob to
e
N
Set the slide control, interlock lever
and throttle trigger to the starting
throttle position.
N
Start the engine by pulling the
starter rope briskly – 10 to 20 pulls
may be necessary.
If the engine still does not start
N
Move the slide control to STOP-0.
N
Remove the spark plug – see
"Spark Plug".
N
Dry the spark plug.
N
Open the throttle wide.
N
Crank the engine several times with
the starter to clear the combustion
chamber.
N
Refit the spark plug – see "Spark
Plug".
N
Move the slide control to START.
N
Set the choke knob to
e
– even if
the engine is cold.
N
Now start the engine.
Throttle cable adjustment
N
Check adjustment of throttle cable –
see chapter on "Adjusting the
Throttle Cable".
Fuel tank run until completely dry
N
After refueling, press the manual
fuel pump bulb at least five times –
even if the bulb is already filled with
fuel.
N
Set the choke knob according to
engine temperature.
N
Now start the engine.
During Break-In Period
A factory-new machine should not be
run at high revs (full throttle off load) for
the first three tank fillings. This avoids
unnecessary high loads during the
break-in period. As all moving parts
have to bed in during the break-in
period, the frictional resistances in the
engine are greater during this period.
The engine develops its maximum
power after about 5 to 15 tank fillings.
During Operation
NOTICE
Do not make the mixture leaner to
achieve an apparent increase in power –
this could damage the engine – see
"Adjusting the Carburetor".
Check chain tension frequently
A new chain has to be retensioned more
often than one that has been in use for
some time.
Chain cold
Tension is correct when the chain fits
snugly against the underside of the bar
and can still be pulled along the bar by
hand. Retension if necessary – see
"Tensioning the Saw Chain".
Operating Instructions