Special Functional Components - Husqvarna K 760 Workshop Manual

SPECIAL FUNCTIONAL COMPONENTS

Torx T27
X-Torq ®
This engine technology was introduced with
its predecessor K750 under the name Dual
Charge, now renamed to X-Torq.
In addition to the intake from the carbu-
rettor with fuel/air mix there are two chan-
nels for intake of fresh air; the upper chan-
nels as shown in the illustration. By directing
the fuel/air mix and the clean air in separate
flushing ducts in the cylinder, the ratios of
fuel mixed air and clean air can be controlled
to ensure that they vary in different phases of
the engine's work cycle.
Cleaner exhaust and better perfor-
mance
The amount of unburned hydrocarbons (HC)
is reduced by approximately 75 % compared
with a traditional design. The emission values
are now clearly under the provisions of
EPAII.
The effect is higher across the whole rev
range, and the torque in the lower rev range
is now considerably higher.
Carburettor
The carburettor has undergone many detail
improvements and a connection to the fuel
chamber has been added for air purge.
Air purge
The pump has a suction function and is con-
nected to the carburettor's fuel chamber. Air
purge empties the fuel chamber of any air
and tops up the fuel chamber with fuel.
With continued pumping any excess fuel is
returned to the tank.
Lower vibration levels
The air filter system and the carburettor are
mounted in the anti-vibration handle device,
which means lower handle vibrations due to
the larger mass (weight) in the handle device.
The carburettor's position in the anti-vibra-
tion section means the carburettor function is
more stable and there is less wear on the car-
burettor's moving parts.
New filter system
The centrifugal cleaning has been significantly
improved with a new flywheel and modified
design of the air intake. The plastic foam fil-
ter from the previous generation is now dis-
continued.
Friction Retarder
The front belt pulley has an inhibiting
mechanism which comes into effect at low
speeds on the cutting blade.
Torx – T27
Torx screw, with the dimension T27, is used
virtually throughout to simplify the service
process.
Note that the screws may have a smooth or
grooved underside.
2
4