374
THE GX21 AIR FILTER
ANY DIRT ENTERING THE GX21 ENGINE THROUGH THE AIR INTAKE COULD DAMAGE
ITS CARBURETTOR, PISTON AND CYLINDER. A FINE AIR FILTER ENSURES THAT DIRT
PARTICLES CANNOT PENETRATE INTO THE INSIDE OF THE POWER UNIT.
The core of the GX21 air lter unit is a ne-pored foam
element 23mm in diameter and 20mm long. The centre of
the cylindrical element has a 15mm bore, which is pushed
onto a star-shaped projection on the lter base. The
cleaned air is sucked into the carburettor through a hole in
the base, also about 15mm in diameter.
FILTERING THE FINEST PARTICLES
The element is held in place by a plain plastic disc with
a diameter of 21mm (slightly smaller than that of the
element), xed onto the upper end of the star-shaped
projection by a single screw. Because the element is
slightly compressed from end to end, the thickness of the
cylindrical wall through which the air is sucked is about
4mm. Dust grains and other ne particles get trapped in
the ne pores of the foam.
The components of the air lter, when assembled, will t onto the
carburettor, which can be seen here just in front of the red cylinder head
of the GX21 engine.
To Next Page
Loading...
