Jonsered CS 2238S Manuel D'utilisation page 14

Fitting the bar and chain
WARNING! Switch off the engine before
!
carrying out any checks or
maintenance. The stop switch
automatically returns to the start
position. In order to prevent
unintentional starting, the spark plug
cap must be removed from the spark
plug when assembling, checking and/or
performing maintenance.
Always wear gloves, when working with
the chain, in order to protect your hands
from injury.
Check that the chain brake is in disengaged position by
moving the front hand guard towards the front handle.
Remove the knob and remove the clutch cover (chain
brake). Take off the transportation ring. (16)
Fit the bar over the bar bolts. Place the bar in its rearmost
position. Place the chain over the drive sprocket locate it
in the groove on the bar. Begin on the top edge of the bar.
(17)
Make sure that the edges of the cutting links are facing
forward on the top edge of the bar.
Fit the clutch cover (chain brake) and locate the chain
adjuster pin in the cut-out in the bar. Check that the drive
links of the chain fit correctly on the drive sprocket and
that the chain is in the groove on the bar. (18)
Tension the chain by turning the wheel down (+). The
chain should be tensioned until it does not sag from the
underside of the bar. (12)
The chain is correctly tensioned when it does not sag
from the underside of the bar, but can still be turned
easily by hand. Hold up the bar tip and tighten the bar
knob by turning the knob clockwise. (13)
When fitting a new chain, the chain tension has to be
checked frequently until the chain is run-in. Check the
chain tension regularly. A correctly tensioned chain
ensures good cutting performance and long life. (19)
Fitting a spike bumper
To fit a spike bumper – contact your service agent.
14 – English
ASSEMBLY / FUEL HANDLING
Fuel
Note! The machine is equipped with a two-stroke engine
and must always be run using a mixture of petrol and
two-stroke oil. It is important to accurately measure the
amount of oil to be mixed to ensure that the correct
mixture is obtained. When mixing small amounts of fuel,
even small inaccuracies can drastically affect the ratio of
the mixture.
WARNING! Always ensure there is
!
adequate ventilation when handling
fuel.
Petrol
• Use good quality unleaded or leaded petrol.
• The lowest recommended octane grade is 90 (RON).
If you run the engine on a lower octane grade than 90
so-called knocking can occur. This gives rise to a
high engine temperature and increased bearing load,
which can result in serious engine damage.
• When working with continuous high revs (e.g.
limbing) a higher octane is recommended.
Running-in
Avoid running at a too high speed for extended periods
during the first 10 hours.
Two-stroke oil
• For best results and performance use JONSERED
two-stroke engine oil, which is specially formulated
for our air-cooled two-stroke engines.
• Never use two-stroke oil intended for water-cooled
engines, sometimes referred to as outboard oil (rated
TCW).
• Never use oil intended for four-stroke engines.
• A poor oil quality and/or too high oil/fuel ratio may
jeopardise function and decrease the life time of
catalytic converters.
Mixing ratio
1:50 (2%) with JONSERED two-stroke oil.
1:33 (3%) with oils class JASO FB or ISO EGB
formulated for air-cooled, two-stroke engines.
Petrol, litre Two-stroke oil, litre
2% (1:50)
5 0,10
10 0,20
15 0,30
20 0,40
3% (1:33)
0,15
0,30
0,45
0,60
5451868-52 Rev. 2 2008-12-19