NSU Supermax - Carburettor, Ignition, and Headlamp Maintenance

The Carburettor '.-
Is a Bing double-lever carburettor.
The cables for the throttle and air slides are adjusted
at the handlebars, by means of Q knurled nut. Make cer-
tain the'lock nut is tightened up again after making the
adjustment.
Don't
change the carburettor setting. It should be main-
tained because it will bring the best results in respect of
performance and petrol consumption. A readjustment is
seldom required. If it becomes necessary for any reason,
rem.ember the following:
With
the throttle slide up to three-quarters open, the
mixture is largely controJled by the jet needle. When the
twistgrip is closed, the engine should tick over rqther
than stop, which means that the slide should then be
just a trifle open. This is achieved by adjusting the throttle
slide stop screw which, after adjustment, should be
secured with its lock nut. If the engine still runs irre-
gularly adjust the air screw accordingly. The tick-over
can only be adjusted while the engine is warm. Read-
justment with
the engine running calls for some experience
and should therefore be entrusted to an NSU dealer or
other competent expert .
.
If the carburettor is to function properly, regular cleaning
is highly essential. For this purpose lake the carburettor
to pieces and wash the parts in petrol. Clean the jet bores
with a bristle of hair 'and blow through; do not use 'a
needle or end of wire as these will spoil the accuracy of
t·he calibrated bore. Before stripping the carburettor,
keep track of the setting of the jet needle, throttle slide
stop, and air screw.
It is also advisable when cleaning the cCllrburettor to
remove
the filter on the petrol,tap, to empty it and to
flush it out with petrol.
The
appearance of spark-
ing-plug electrodes gives
some indication of the
correctness of the car-
burettor settings.
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