Secondary air
The SAS for 125cc leader engines operates in a similar manner to the SAS for 2T engines.
The differences are the following:
instead of entering through the muffler as for 2T engine, the secondary air enters directly in the discharge
pipe on the head.
The 2T reed valve has a diaphragm. The unit, indicated by an arrow in the figure, has a cut-off connected
to the depression intake on the inlet manifold that cuts the air inlet in deceleration, to avoid explosions
in the muffler.
Air is drawn through the opening «A», goes through the first filter and is channelled through the opening
«B».
Air gets to the second filter «B» through the opening shown in the figure. Now, the filtered air enters
the diaphragm device, and then is channelled to the head.
X9 Evolution 125 Characteristics
CHAR - 11
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