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Qui puoi leggere i vantaggi/caratteristiche che la serie AX dei motori OS ha rispetto alla precedente FX (non tutta la serie è stata "sostituita"):
"The most noticeable difference between the FX and AX series is the square muffler. While the AX shares a lot with the older FX series like dual ball bearings, mounting pattern and long crankshaft the folks at OS have added some improvements to the AX. These improvements include a finer taper on the needle valve for precise adjustment, redesigned ports for easier operation and a redesigned needle valve bracket that works in both the horizontal and vertical positions".
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