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3—6
M A I N T E N A N C E A N D SERVICE
(plug still being connected with the plug wire). If the
starting device is now operated, a powerful spark should
flash over between the electrodes. O i l y plugs or plugs
w i t h dirt deposits between the electrodes will not pro-
duce any spark and must be cleaned (wooden splinter or
steel brush).
W h e n replacing, only use a spark-plug whose thermal
value corresponds to the figure indicated in the data
sheet. The spark g a p should be between 0,5 to 0,6 mm.
If the g a p is wider, regap by bending the outer elec-
trode. W h e n screwing the plug in, take care it fits well
into the thread and may easily be turned. Never have
recourse to force when screwing i n : Screw in by hand
2 or 3 turns, only then you may use the
spark-plug
wrench. Standard plug according to data sheet.
3.3.2 Decarbonizing the engine
The constitution
of deposits on cylinder
cover,
piston
head and exhaust port is a necessary corollary of the
w o r k i n g of our combustion engines (two-stroke engines),
but a length is a source of troubles. Combustion
pro-
ducts originating
from oil as well as from fuel
must
therefore be removed from time to time.
Cylinder cover and piston head
Removing the carbon deposits from cylinder cover and
piston head must be carried out by means of a blunt
edged instrument (screwdriver or the like). As surface
hardness of light alloys is relatively low, their surfaces
may easily be scratched. Scratching is to be avoided as
every new scratch entails inevitably the constitution
of
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