2.175 Ignition
The ignition consists of the ignition coil, which is connected to the flywheel housing, the ignition line,
the spark plug and the circuit breaker with parallel switched condensor that are mounted on the
geneartor´s holding cap. The breaker cam wich rotates along with the crank causes the breaker
lever, that carries one of the circuit breaker contacts, to be raised against the pressure of the
breaker spring and thus causes the primary current to be interrupted while the contacts are
seperated. Just in this moment, the voltage that has been generated while the contacts were
closed
,
Image 22 circuit breaker
breaks down and inducts a high voltage of 10.000 to 15.000 volts. This high voltage flows through
the high voltage cable directly to the spark plug.
To prevent any damaging spark from bridging the points, a condenser is switched parallel to the
breaker points. To achieve the the right contact distance, which is at the highest point of the
breaker cam (0.4mm) and to set the best ignition timing (4.0mm before TDC), the two-pieced stator
plate is kept adjustable. A little lube-cloth, that is kept under spring tension keeps the cam´s
slideway slightly greased and thus reduces wear of the breaker lever to a bare minimum.
2.18 Carburetor and filter
Processing and conditioning the right mixture of fuel and air for combustion is maintained by the
BVF (Berliner Vergaser Fabrik, engl.: Berlin Carburetor Plant) 24 KN 1-1 Round slidegate valve
carburetor.
The fuel level inside the floater housing is maintained on an optimal balanced level of about one to
two mm under the discharge opening. This is achieved by the floater and the float needle valve. By
actuating the dabber on the floater housing, the floater is being pushed down and thus keeps the
float needle valve open. By doing this, the fuel floods at the needle valve opening and over enriches
the air / fuel mix that is needed for starting a cold motor. The fuel travels from the floater housing
through the main jet into the needle jet, who´s output opening can be adjusted as a result of it´s
conical design. The needle jet is installed in the gate valve (Actually a round slidegate valve in this
carburetor). It so has to follow the same movement as the slidegate, which is operated through the
throttle control on the right hand side of the handlebar. By opening the slidegate, air and fuel are
now equally and evenly distributed. Thereby always the correct combustible ratio of air and
fuel,which is necessary for
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General