Ranger 39 (YD-KU03-38) & Ranger 46 (YD-KU01-45A)
5. Operating the Engine
STARTING THE ENGINE
7. Fill fuel and chain oil tanks respectively, and
tighten the caps securely.
8. Set the switch to "I" position.
9. Pull out the choke knob to the second-stage
position. The choke will close and the throttle
lever will then be set in the starting position.
10.
While holding the saw unit securely on the
ground, pull the starter rope vigorously.
11.
When engine has ignited, first push in the
choke knob to the first-stage position and then
pull the starter again to start the engine.
12.
Allow the engine to warm up with the
throttle lever pulled slightly.
CHECKING THE OIL SUPPLY
After starting the engine, run the chain at medium
speed and see if chain oil is scattered off as
shown in the figure.
ADJUSTING THE CARBURETOR
The carburetor on your unit has been factory
adjusted, but may require fine tuning due to a
change in operating conditions.
Before adjusting the carburetor, make sure that
the provided air/fuel filters are clean and fresh
and the fuel properly mixed.
When adjusting, take the following steps:
6. Stop engine and screw in both the H and L
needles until they stop. Never force them.
Then set them back the initial number of turn
as shown below.
7. Start the engine and allow it to warm up at
half-throttle.
8. Turn the L needle slowly clockwise to find a
position where idling speed is maximum, then
set the needle back a quarter (1/4) turn
counterclockwise.
9. Turn the idle adjusting screw (T) countercl-
ockwise so that the saw chain does not turn. If
the idling speed is too slow, turn the screw
clockwise.
10.
Make a test cut and adjust the H needle for
best cutting power, not for maximum speed.
CHAIN BRAKE
This machine is equipped with an automatic
brake to stop saw chain rotation upon occurrence
of kickback during saw cutting. The brake is
automatically operated by inertial force, which
acts on the weight fitted inside the front guard.
This brake can also be operated manually with
the front guard turned down to the guide bar.
To release the brake, pull up the front guard
toward the front handle till a "click" sound is
heard.
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