Magnet ignition for Zündapp KS 750 and BMW R 75
H-P Hommes
Out of the book: Zündapp KS750 und BMW R 75 Wehrmachtsgespanne
gestern und heute page 36/37
The Wehrmachtsgespanne were built with
a magnet ignition again although former models Ks 600 and BMW R 71 were
built with a battery and coil ignition. The magnet ignition gave a better
reliability, because it was independent of the generator and the battery.
There were two different products:
The
Noris ZGA2 and the
Bosch FJ2 R134.
Problems with Noris and Bosch magnetos
When the bike starts well with a cold
but does not start with a warm engine because the spark is not strong
enough, then this is a sign
that the coil is damaged and has
to be replaced.
Ignition timing
Turn the engine on TDC, so that the
arrow -B- shows to the left
side on the advance ignition. This shows that the left cylinder is in
the expansion stroke. Now the contact
breaker should start to open. Then the ignition is adjusted correctly.
For verification turn the engine half a turn further so that the
contact is closed and then put
a piece of cigarette paper between the contacts. Now you turn the engine
slowly to TDC. When you can take the paper off the TDC sign should be
in the middle of inspection hole.
If not, you have to regulate the ignition
timing by changing the ignition gap accordingly. The ignition gap could
be between 0,2 and 0,5 mm.
Attention: The ground plate -A-
may not be turned at any point.
I
NORIS magneto -
measure the oil level
-
camouflage
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