24 – English
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MAINTENANCE
Basic setting
• The carburettor is set to its basic setting when test run at the
factory. The basic setting is richer than the optimal setting
and should be kept during the machine‘s first working
hours. Thereafter the carburettor should be finely adjusted.
Fine adjustment should be carried out by a skilled
technician. The basic setting can vary between: H = 1 to 1
1/4 turns resp. L = 1 to 1 1/4 turns.
NOTE! If the blade rotates while the engine is idling the T-
screw should be turned anti-clockwise until the blade stops.
Rec. idling speed 2 700 rpm.
WARNING!
If the idling speed cannot be adjusted so
that the blade stops, contact your
service workshop. Do not use the
machine until it has been correctly
adjusted or repaired.
NOTE!
The machine should only be used for short periods at its
highest speed. For optimal setting of the carburettor a qualified
technician with access to a rev counter should be contacted.
The recommended max. speed should not be exceeded:
GR41/50/RS44: 12 500 rpm
RS51: 13 500 rpm
During a running-in period (≈ 8 -10 tanks) the maximum
speed should be set 6-700 rpm below the recommended
maximum speed (= opening the H-needle a further 1/8 turn).
Carburettor
Your JONSERED product has been designed and
manufactured to specifications that reduce harmful emissions.
After your unit has been run 8-10 tanks of fuel the engine has
broken in. To ensure that your unit is at peak performance and
producing the least amount of harmful emissions after break
in, have your authorized servicing dealer, who has a revolution
counter at his disposal, to adjust your carburettor for optimum
operating conditions.
!
WARNING!
The complete clutch cover with shaft
must be fitted before the machine is
started, otherwise the clutch can become
loose and cause personal injury.
Operation
• The carburettor governs
the engine‘s speed via the
throttle. Air/fuel is mixed
in the carburettor. The
air/fuel mixture is
adjustable. To take
advantage of the engine‘s
optimal output the
adjustment must be
correct.
• The setting of the
carburettor means that
the engine is adapted to
local conditions, for
example, the climate,
altitude, petrol and the
type of 2-stroke oil.
• The carburettor is
equipped with three
adjustment possibilities:
L = Low speed needle
H = High speed needle
T = Idle speed adjuster
screw
• The fuel quantity in relation to the air flow permitted by
the throttle opening is adjusted using the L and H-needles.
Turning the needles clockwise gives a leaner fuel mixture
(less fuel) and turning them anti-clockwise gives a richer
fuel mixture (more fuel). A leaner mixture gives high revs
while a richer mixture give less revs.
• The T-screw regulates the position of the throttle while the
engine is idling. Turning the screw clockwise gives a higher
idling speed while turning it anti-clockwise gives a lower
idling speed.
GR41/50
RS44
RS51
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