Bort BBK-2018 - Maintenance Schedule; Carburettor Adjustment

10
Lack of concentration can lead to kickback if the kick-
back zone of the bar accidentally touches a branch,
nearby tree or some other object.
Havecontrolovertheworkpiece.Ifthepiecesyou
intend to cut are small and light, they can jam in the
sawchainandbethrowntowardsyou.Thisisnotnec-
essarily dangerous in itself, but you may be surprised
and lose control of the saw. Never saw stacked logs or
brancheswithoutrstseparatingthem. Onlysawone
log or one piece at a time. Remove the cut pieces to
keep your working area safe.
4 Never use the chain saw above shoulder height and
try not to cut with the tip of the bar. Never use the chain
saw one-handed!
5 You must have a steady stance in order to have full
control over the chain saw. Never work standing on a
ladder,inatreeorwhereyoudonothavermground
to stand on.
6 Always use a fast cutting speed, i.e. full throttle.
7Takegreatcarewhenyoucutwiththetopedgeofthe
bar, i.e. when cutting from the underside of the object.
Thisisknownascuttingonthepushstroke.Thechain
tries to push the chain saw back towards the user. If the
saw chain is jamming, the saw may be pushed back
at you.
8 Unless the user resists this pushing force there is a
risk that the chain saw will move so far backwards that
only the kickback zone of the bar is in contact with the
tree, which will lead to a kickback.
Cutting with the bottom edge of the bar, i.e. from the
top of the object downwards, is known as cutting on
the pull stroke. In this case the chain saw pulls itself
towards the tree and the front edge of the chain saw
body rests naturally on the trunk when cutting. Cutting
on the pull stroke gives the operator better control over
the chain saw and the position of the kickback zone.
9Followtheinstructionsonsharpeningandmaintain-
ing your bar and chain. When you replace the bar and
chain use only combinations that are recommended by
us.
GENERAL
The user must only carry out the maintenance and
serviceworkdescribedinthisOperator’sManual.More
extensive work must be carried out by an authorised
service workshop.
CARBURETTOR ADJUSTMENT
YourBORTproducthasbeendesignedandmanufac-
turedtospecicationsthatreduceharmfulemissions.
FUNCTION
● Thecarburettorgovernstheengine’sspeedviathe
throttle control. Air and fuel are mixed in the car-
burettor.The air/fuelmixtureis adjustable. Correct
adjustment is essential to get the best performance
from the machine.
● The T-screw regulates the throttle setting at idle
speed.IftheT-screwisturnedclockwisethisgives
a higher idle speed; turning it anti-clockwise gives a
lower idle speed.
Basic settings and running in
Thebasiccarburettorsettingsareadjustedduringtest-
ing at the factory. Fine adjustment should be carried
out by a skilled technician.
Rec.idlespeed:SeetheTechnicaldatasection.
FineadjustmentoftheidlespeedT
Adjust theidle speed withtheT-screw. If itisneces-
sary to re-adjust, turn the T-screw clockwise while
the engine is running, until the chain starts to rotate.
Then turn anticlockwise until the chain stops. When
the idle speed is correctly adjusted the engine should
run smoothly in every position and the engine speed
should be safely below the speed at which the chain
starts to rotate.
WARNING! Contact your servicing dealer, if
the idle speed setting cannot be adjusted so
that the chain stops. Do not use the chain
saw until it has been properly adjusted or repaired.
MAINTENANCE SCHEDULE
Thefollowingisalistofthemaintenancethatmustbe
performed on the machine. Most of the items are de-
scribed in the Maintenance section.