Replacing The Air Filter; Engine Management; Adjusting The Carburetor - Stihl HT 250 Instruction Manual

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Replacing the Air Filter

If there is a noticeable loss of engine
power
1
3
2
Turn the choke knob to g
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Press in the tab (1) and remove the
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filter cover (2).
Clean away loose dirt from around
N
the air filter (3) and inside the filter
cover.
Remove the filter element and
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check it – replace if dirty or
damaged.
Install the filter element in the filter
N
housing.
Fit the filter cover.
N
26

Engine Management

Exhaust emissions are controlled by the
design of the fundamental engine
parameters and components (e.g.
carburation, ignition, timing and valve or
port timing) without the addition of any
major hardware.

Adjusting the Carburetor

General Information
The carburetor comes from the factory
with a standard setting.
This setting provides an optimum fuel-air
mixture under most operating
conditions.
Preparations
Shut off the engine.
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Check chain tension
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Check the air filter and clean or
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replace if necessary.
Check the spark arresting screen in
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the muffler and clean or replace if
necessary.
Check that the throttle cable is
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properly adjusted – readjust if
necessary – see chapter on
"Adjusting the Throttle Cable".
HT 250