Starting The Engine; Stopping The Engine - Makita DCS431 Owner's And Safety Manual

Starting the engine

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Cold-starting the DCS430, 431, 520, 540, 5200:
The carburetors of these saws have a choke valve for cold
starting (mixture enrichment).
To make it easier to start, the chain saw DCS431 is equipped
with a semi-automatic decompression valve (B/5). Pushing
this valve in reduces the amount of compression effort needed,
so that it is easier to bring the engine up to starting speed when
pulling the starter cable. The high pressure increase in the
combustion chamber that results from the first ignitions will
automatically close the decompression valve (button pops
back out).
Model DCS430, DCS520 and DCS5200 do not have a
decompression valve. Starting and carburetor adjustment
are as for model DCS 431 except without the instruction
"Push the decompression valve".
- Put the short-circuit ignition switch in the "I" position (B/1).
- Pull out the choke (B/2).
- Depress the half-throttle lock button (B/3) half-way and hold.
- Depress the throttle (B/4) and half-throttle lock button (B/3)
all the way. Release the throttle - it will now be held at
half-throttle by the lock button.
- Push the decompression valve (B/5) (only DCS431).
- Slowly pull out the starter cable until you notice resistance
(the piston is positioned before the top dead center).
- Now pull the starter cable with a fast and forceful
movement until you hear the first ignition.
CAUTION: Do not pull out the starter cable more than approx.
50 cm, and lead it back by hand.
- When you hear the first ignition, push the choke (B/2) in.
Push the decompression valve again (only DCS431) and
pull the starter cable. As soon as the engine is running, press
the throttle (B/4) to release the half-throttle lock (B/3),
allowing the engine to idle.
CAUTION: As soon as the engine is started it must be put in
idle to prevent the chain brake from being damaged.
- Now release the chain brake.
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- Move at least 10 feet (3 m) away from the place where you
fuelled the saw.
- Make sure you have a good footing, and place the saw on the
ground in such a way that the chain is not touching anything.
- Engage the chain brake (lock).
- Hold the tubular handle tightly with one hand and press the
chain saw to the ground.
- Steady the rear handle by standing in the hand guard.
Cold-starting the DCS520i and DCS5200i:
The carburetors of these saws have a fuel-injection system
(injection carburetor) for cold starting (mixture enrichment).
These two cold-starting systems work differently.
- Put the short-circuit ignition switch in the "I" position (B/1).
- Pull out the choke (B/2) (opens the injection valve).
- Depress the half-throttle lock button (B/3) half-way and hold.
- Depress the throttle (B/4) and half-throttle lock button (B/3)
all the way. Release the throttle - it will now be held at
half-throttle by the lock button.
Note: If the temperature is below -15° C (5° F) start at full
throttle.
- Slowly pull out the starter cable until you notice resistance
(the piston is positioned before the top dead center).
- Now pull the starter cable with a fast and forceful
movement until you hear the first ignition.
CAUTION: Do not pull out the starter cable more than approx.
50 cm, and lead it back by hand.
- Push in the choke (B/2) when the engine starts, or after
the first audible ignitions.
- If the engine has not yet started, keep pulling the starter
cable until it does.
- As soon as the engine is running, press the throttle (B/4) to
release the half-throttle lock (B/3), allowing the engine to idle.
CAUTION: As soon as the engine is started it must be put in
idle to prevent the chain brake from being damaged.
- Now release the chain brake.
Warm starting
(all models):
- As described above for cold starting, but without using
the choke (B/2). Keep the choke in.
Starting under special conditions
(MAKITA DCS520i and DCS5200i only):
In conditions of high ambient temperature and when the engine
has been stopped for only a short period following full-load
operation, if a fuel with a low boiling point is used (winter fuel), and
at high altitudes especially, the heat could prevent the engine from
starting immediately. If this happens, proceed as follows:
- Pull out the choke (B/2) and start the engine at half-throttle,
as described for cold starting.
- When the engine has started, release the chain brake
immediately and gun the engine all the way several times
until it runs smoothly.
- Now push in the choke (B/2).
If the engine won't start:
If the engine refuses to start even after a number of tries, check
the spark plug (see the section on "Replacing the spark plug").

Stopping the engine

- Put the short-circuiting switch (B/1) in position "O" (STOP).
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