Checking Spark Plug; General Notes On Operation - Stihl TS 350 Manual

&KHFNLQJ 6SDUN 3OXJ
Wrong fuel mix (too much engine oil in
the gasoline), a dirty air filter and
unfavorable running conditions (mostly
at part throttle etc.) affect the condition of
the spark plug. These factors cause
deposits to form on the insulator nose
which may result in trouble in operation.
If engine is down on power, difficult to
start or runs poorly at idling speed,
first check the spark plug.
•
Remove spark plug -
see chapter "Starting":
•
Clean dirty spark plug.
•
Check electrode gap -
it should be 0.5mm/0.02" $ -
readjust if necessary.
•
Use only resistor type spark plugs
of the approved range.
Rectify problems which have caused
fouling of spark plug:
Incorrect carburetor setting, too much oil
in fuel mix, dirty air filter,
unfavorable running conditions, e.g.
operating at part load.

A
•
Fit a new spark plug after
approx. 100 operating hours -
or earlier if the electrodes are
badly eroded.
:DUQLQJ
To reduce the risk of fire and burn injury,
use only spark plugs authorized by
STIHL (see "Specifications"). Always
press spark plug boot  snugly onto
spark plug terminal  of the proper
size. (Note: If terminal has detachable
SAE adapter nut, it must be attached.)
A loose connection between spark plug
terminal and ignition wire connector in
the boot may create arcing that could
ignite combustible fumes and cause a
fire.
*HQHUDO 1RWHV RQ 2SHUDWLRQ
6WDUWLQJ IRU ILUVW WLPH
A factory new machine should be run
with the carburetor set slightly on the
rich side for the first three tank fillings
(see chapter on "Carburetor") so that the
cylinder bore and the bearings receive
additional lubrication during the break-in
period.
As all the moving parts have to bed in
during the break-in period, the frictional
1
resistances in the engine are greater
during this period. For this reason the
engine only develops its maximum
power after about 5 to 15 tank fillings.
The carburetor setting must never be
made leaner in order to achieve an
apparent increase in power as this could
cause the engine to exceed its maximum
permissible rpm (see "Specifications"
and "Carburetor").
'XULQJ RSHUDWLRQ
After a long period of working at full load
it is advisable not to shut off the engine
immediately, but let run for a short while
at idling speed. This allows the heat
which has been generated in the engine
during full throttle operation to be
dissipated by the flow of cooling air and
also protects engine-mounted
components (ignition, carburetor) from
thermal overload.
76