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Correctly adjusted carburetor
A correctly adjusted carburetor means that the machine ac-
celerates without hesitation and the machine 4-cycles a little
at max speed. Furthermore, the cutting attachment must not
rotate/move at idling. A too lean adjusted low speed needle L
may cause starting diffi culties and bad acceleration.
A too lean adjusted high speed needle H gives lower power =
less capacity, bad acceleration and/or damage to the engine.
A too rich adjustment of the two speed needles L and H gives
acceleration problems or too low working speed.
MAINTENANCE
Final setting of the idling speed T
Adjust the idling speed with the
screw T, if it is necessary to re-
adjust. First turn the idle speed
adjusting screw T clockwise
until the cutting attachment
starts to rotate/move.
Then turn, counter-clockwise
until the cutting attachment
stops. A correctly adjusted idle
speed setting occurs when the
engine runs smoothly in every
position. It should also be good
margin to the rpm when the
cutting attachment starts to
rotate/move.
CAUTION! Contact your ser-
vicing dealer, if the idle speed
setting cannot be adjusted so
that the cutting attachment
stops. Do not use the machine
until it has been properly ad-
justed or repaired.
High speed needle H
The high speed needle H
infl uences the power, speed,
temperature and fuel con-
sumption of the machine. A
too lean adjusted high speed
needle H (high speed needle
H closed too much) gives over-
revs and damages the engine.
Do not let the machine run at
full speed for more than 10
seconds.
Turn the high speed needle
very slowly clockwise until
engine speed is reduced.
Thereafter turn the high speed
needle very slowly counter-
clockwise and stop when the
engine begins to run roughly.
Then turn the high speed
needle slowly the minimum
amount clockwise until the
engine runs smoothly.
The high speed needle H is
correctly set when the ma-
chine ”4-cycles” a little. If the
machine ”whistles” the set-
ting is too lean. If there is too
much smoky exhaust gas at
the same time as the machine
”4-cycles” much, the setting is
too rich.
NOTE! For optimum setting of the carburetor, contact a
qualifi ed servicing dealer who has a revolution counter at
his disposal.