Zenoah CHAIN SAWS G2500 - Manual (Page 12)

G2500
GB-12
Switch
1. H and L needles are restricted within the number of
turn as shown below.
H needle : -1/4
L needle : -1/4
2. Start the engine and allow it to warm up in low speed
for a few minutes.
3. Turn the idle adjusting screw (T) counterclockwise
so that the saw chain does not turn. If the idling
speed is too slow, turn the screw clockwise.
4. Make a test cut and adjust the H needle for best
cutting power, not for maximum speed.
■ CHAIN BRAKE
The chain brake is a device which stops the chain in-
stantaneously if the chain saw recoils due to kickback.
Normally, the brake is activated automatically by inertial
force. It can also be activated manually by pushing the
brake lever (left-hand guard) down toward the front.
When the brake operates, a yellow cone pops up from
the base of the brake lever.
Releasing the Brake
Pull the brake lever up toward the left-hand handle until
it clicks into place.
■ ADJUSTING THE CARBURETOR
The carburetor on your unit has been factory adjusted,
but may require fine tuning due to a change in operat-
ing conditions.
Before adjusting the carburetor, make sure that the pro-
vided air/fuel filters are clean and fresh and the fuel prop-
erly mixed.
When adjusting, take the following steps:
Be sure to adjust the carburetor with the bar chain at-
tached.
NOTE
• When the brake operates, release the throttle lever
to slow down the engine speed. Continuous opera-
tion with the brake engaged will generate heat from
the clutch and may cause trouble.
• At machine inspection prior to each job, check the
operating condition of the brake following the steps.
1. Start the engine and grasp the handle securely with
both hands.
2. Pulling the throttle lever to maintain the chain opera-
tion, push the brake lever (left-hand guard) down
toward the front using the back of your left hand.
3. When the brake operates and the chain is stopped,
release the throttle lever.
4. Release the brake.
■ STOPPING THE ENGINE
1. Release the throttle lever to allow the engine to idle
for a few minutes.
2. Set the switch to the “O” (STOP) position.
WARNING
Release
Activate
the brake.
L needle
H needle
Idle adjusting
screw