THE CARBURATION AT MID RPM
It can be set by means of:
- conical needle
- the spray nozzle
The conical needle acts as shutter on the spray nozzle hole, and its axial position is
determined by the throttle opening. Thanks to its particular conical configuration,
when the throttle gradually opens, the needle creates a less shutter in the spray
nozzle hole, regulating consequently the fuel flow.
The needle and the spray nozzle have been chosen to satisfy the different
conditions. The carburetion setting is performed by lifting or lowering the conical
needle vs. the throttle.
A richer carburetion is got by lifting the needle, by moving down the retainer clip
to a lower notch; obviously a leaner carburation is got by lowering it, so moving
the retainer clip to an upper notch. (see fig. 3). The basic needle adjustment is
shown on the picture.
At the conical needle, is accessed by unscrewing the upper cover of the carb.; then
pull off the throttle valve together with the needle, off hook the throttle cable, and
unscrew the fixing screw on the valve itself.
THE CARBURATION AT TOP RPM
It is mainly performed only by means of:
- the max. jet
By increasing the max jet size "H" (see fig. 2) we will
get a richer carburation and , conversely, a leaner
one by decreasing the jet size.
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