Dirt shield
The dirt shield, attached to the crankcase offers
additional protection against dirt. Never ride the moped
without this shield.
To protect the dirt shield against destruction special
distance bushes are fitted in the bolt holes. Do not forget
to fit these bushes.
Spark plug
The spark plug is one of the most important parts of the
engine. Two temperatures are very important for the
spark
plug:
— The temperature at which the spark plug burns itself
clean.
This temperature is about
500°C
(930°F).
— The temperature causing spontaneous ignition.
This temperature is about 900°C
(1650°F).
It will be clear that the temperature first mentioned
always must be reached to give a clean spark plug and
that the second temperature never may be reached to
prevent damage of for instance the piston.
For that reason the sparkplug has a very specific heat
grade,
which has been determined experimentally for the
engine.
The spark plug for the 20 and 25
mph.
engines is fixed on
Bosch
W
175 T1 with Champion L 85 as an equivalent,
and for the 30 mph. engines Bosch W 240 T1 with
Champion L 81 as an equivalent.
The spark plug gap has to be .5 mm. (.020").
Always check this because there are similar spark plugs
with a gap of .7 mm. (.028").
Always use the prescribed spark plug to prevent
difficulties.
The sight of the spark plug gives much information
about the condition of the engine.
— If the electodes are grey/yellow-brown, the engine is
in a good condition.
The heat grade of the spark plug is correct.
— A velvetlike dull black fur
On the electrodes can be caused by:
a too large jet
a too large electrodes gap
a heat grade to
high,
so a spark plug of a too cold
type.
—
A greasy black oily fur on the electrodes can be
caused by:
too much oil in mixture
worn out cylinder or piston rings
— Electrodes burnt with melting pearls on the insulator
bottom and a fur consisting of lead compounds can
be caused by:
a too small jet
a leaky spark plug or a not tightened spark plug
heat grade too low, so a plug of a too warm type.
— Glassy sand pearls between the electrodes can be
caused by:
a dirty air filter
riding without or with a shortened intake tube
riding without dirt shield.
Fuel
During the break in period (500 miles) the mixture must
be 1 : 40 (2.5%) that means 1 part of oil to 40 parts of
gasoline.
After the break in period the mixture can be reduced to
1 : 50 (2%).
Since the oil in the mixture is the only lubrication for all
moving parts of the engine never use a lower percentage
of oil than the percentage prescribed.
Only use a good quailty 2-stroke oil and regular gasoline,
so never premium!!
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