Maintenance - Husqvarna 129R Operator's Manual

The life span of the machine can be reduced and
the risk of accidents can increase if machine
maintenance is not carried out correctly and if
service and/or repairs are not carried out
professionally. If you need further information,
please contact your nearest authorized service
dealer.
Unit/Maintenance Safety
Disconnect the spark plug before performing
maintenance, except carburetor adjustments.
WARNING: The complete clutch, clutch
cover, and shaft must be fitted before the
machine is started, otherwise parts could
come loose and cause personal injury.
Carburetor
Function
The carburetor governs the engine's speed via the
throttle control. Air and fuel are mixed in the
carburetor.
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 counterclockwise
gives a lower idle speed.
Basic setting
The basic carburetor settings are adjusted during
testing at the factory. Fine adjustment should be
carried out by a trained technician.
WARNING: The cutting attachment may
be spinning during carburetor
adjustments. Wear your protective
equipment and observe all safety
instructions. Be sure the cutting
attachment stops turning when the engine
idles. When the unit is turned off, make
sure the cutting attachment has stopped
before the unit is set down.
CAUTION! If the cutting attachment rotates
when the engine is idling the idle adjustment
screw T should be turned counterclockwise
until the cutting attachment stops.
Recommended idle speed:
See "Technical data" section.
Recommended max. speed:
See "Technical data" section.
Fine adjustment of the idle speed-T
Adjust the idle speed using the idle adjustment
screw-T if it is necessary to readjust. First, turn the
idle adjustment screw-T clockwise until the cutting
attachment starts to rotate. Then, turn the screw
counterclockwise until the cutting attachment
stops. The idle speed is correctly adjusted when
the engine will run smoothly in every position. The

MAINTENANCE

idle speed should also be well below the speed at
which the cutting attachment starts to rotate.
Adjusting the start throttle speed
The correct start throttle speed is set by means of
an adjuster on the rear of the handle next to the
cable. Use this screw (4 mm Allen screw) to
increase or decrease the start throttle speed.
Proceed as follows:
1. Run the machine at idle.
2. Press the start throttle lock as described under
the heading Starting and stopping.
3. If the start throttle speed is too low (below 4000
rpm), turn adjuster screw (A) clockwise until the
cutting attachment starts to rotate. Then turn
adjuster screw (A) clockwise an additional 1/2
turn.
4. If the start throttle speed is too high, turn
adjuster screw (A) counterclockwise until the
cutting attachment stops. Then turn adjuster
screw (A) clockwise an additional 1/2 turn.
WARNING: If the idle speed cannot be
adjusted so that the cutting attachment
stops, contact your servicing dealer. Do
not use the machine until it has been
correctly adjusted or repaired.
Muffler
CAUTION! Muffler is fitted with a catalytic
converter designed to reduce harmful exhaust
gases.
(Starter housing removed for clarity)