N-Zeta 501/01, Workshop Manual

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The idling jet #17, the pilot, air screw #18 and the throttle valve stop screw
#15 are located on the R. H. side of the carburettor and are accessible through the
bodywork side door. When repairing the float, push out the float spindle #31a first
thus freeing the float #31. Repair the float or replace it and assemble proceeding in
reverse manner. The float spindle is secured against working free by two screws #32
which fasten the float chamber top #20. In case of loss of any of these four screws, it
is necessary that the float chamber top should be always fastened with two screws
on the sides of the spindle. Dismantling or assembling the float chamber top with
float it is always necessary to handle carefully these parts in order not to damage
the, float stop which would alter the fuel level.
To Set The Carburettor According To The Manufacturers Specifications,
Proceed As Follows:
First check the throttle valve needle position / how to assemble the throttle
valve has been described in the preceding paragraph / slacken the lock nut #10,
screw the cable guide #9 into the mixing chamber top #8 thus freeing the throttle
valve #4. After removing the float chamber top, unscrew the main jet #19 and check
its value.
The pilot air screw #18 serves to set the idling speed. Tighten the pilot air
screw first /clockwise/ and then slacken it /anticlockwise/ by the value prescribed for
setting. With the engine running, its idle speed is set by means of the throttle valve
stop screw #15. By unscrewing the cable guide, the throttle cable slack can be taken
up and the cable guide is then secured with the lock nut #10.