General Notes on Operation
Starting for first time
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 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").
During operation
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.
Spark plug
An incorrect carburetor setting, the wrong fuel mix (too
much engine oil in the gasoline), a dirty air filter and un-
favorable
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
30 trouble in operation.
Top: Spark plug in good condition
Bottom: Spark plug fouled because
of
incorrect running conditions
If the engine is down on power, difficult to start or runs
poorly at idling speed, check the spark plug
before looking
any further. If the spark plug is dirty, clean it and check
the
electrode gap. Readjust if necessary; the correct gap is
0.5
mm
(0.02 in). The spark plug should be replaced
after
about 100 operating hours
or
earlier if the electrodes
are
badly eroded.
In order
to ensure
trouble-free operation it is necessary to
rectify the faults which have caused fouling of the spark
plug.
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