Maintenance - Jonsered 6000+ Operator's Manual

Trial run
!
WARNING!
When the sawmill is running and
the blade is rotating without any
sawing being done, the lower saw
blade guard must be pulled out
completely to the left.
!
WARNING!
The motor must be mounted on
the saw before it is started.
Otherwise, the coupling can come
loose and cause injuries.
Carburettor
Operation
• The carburettor governs the engine speed
via the throttle. Air/fuel are mixed in the
carburettor. The air/fuel mixture is adjustable.
To take advantage of the saw's maximum
output the setting must be correct.
• Adjusting the carburettor means the engine is
adapted to local operating conditions, e.g.
climate, altitude, petrol and the type of 2-
stroke oil used.
• The carburettor has three adjustment
possibilities:
L = Low speed jet.
H = High speed jet.
T = Adjustment screw for idling.
• The fuel quantity required in relation to the air
flow, provided by opening the throttle, is
adjusted by the L and H-jets. If they are
screwed clockwise the air/fuel ratio becomes
leaner (less fuel) and if they are turned anti-
clockwise the ratio becomes richer (more
fuel). A leaner mixture gives a higher engine
speed and a richer mixture give a lower
engine speed.
• The T screw regulates the idling speed. If the
screw T is turned clockwise this gives a
higher idling speed; anti-clockwise a lower
idling speed.
30
English

MAINTENANCE

Basic setting and running in
The carburettor is adjusted to a basic setting when
the saw is tested at the factory.
The basic setting is: H = 1
L = 1 1 /
4
To provide the engine's components with a
good level of lubrication (running in) the
carburettor should be set for a richer fuel mixture
for the first 3-4 hours of operating. To obtain
this adjust the overspeed 6-700 rpm under the
recommended max. overspeed.
If you do not have the possibility to check the
overspeed using a tachometer the H-jet should not
be set for a leaner mixture than that stated for the
basic setting.
The recommended overspeed should not be
exceeded.
NOTE! If the chain rotates while idling the T screw
should be adjusted anti-clockwise until it stops.
Fine adjustment
When the saw has been "run-in" the carburettor
should be finely adjusted. The fine adjustment
should be carried out by qualified person. First
adjust the L-jet, then the idling screw T and then the
H-jet.
The following engine speed applies:
Max. overspeed
Idling speed
Conditions
• Before any adjustments are made the air
filter should be clean and the cylinder cowling
fitted. Adjusting the carburettor while a dirty
air filter is in use will result in a leaner mixture
when the filter is finally cleaned. This can
give rise to serious engine damage.
• Carefully turn the L and H-jets clockwise to
the bottom. Now turn the jets one turn anti-
clockwise. The carburettor is now set to H =
1 and L = 1.
• Now start the saw according to the starting
instructions and run it warm for 10 minutes.
CAUTION!
If the saw blade rotates while the motor is
running at idling speed, the T-screw must
be turned counter-clockwise until the saw
blade stops moving.
1 / turns respective
4
turns.
12.500 rpm
2.400 rpm