Reed valve
Of all possibilities to control a two-stroke engine, reed
valve control assures the best cylinder filling especially in
the lower revolution range.
For that reason the performance at low revolutions is
better than with any other system, which is very
important for acceleration and climbing power.
Another advantage is that this arrangement eliminates
the waste of fuel which can occur in engines using other
methods of intake control.
Important is that the reed valve has been manufactured
with very high accuracy.
The reed valve is activated by variations in pressure in
the crancase.
If the piston ascends the crankcase volume will increase
causing decrease of pressure (below the atmosferica)
which will open the reeds.
If the piston descends the reverse occurs.
It will be clear that it is extremely important that the
reeds shut off the reed valve completely, not requiring
any tension, so that they can follow the pressure
variations freely.
Never try to check the elastic quality of the reeds with a
knife or anything like it, nor clean them with any other
object.
The only right way to clean them is with a soft brush
dipped in kerosine.
In case of any doubt about the condition of a reed valve
(for instance when seeing light between reeds and
housing), put the pointed side of the reed valve in your
mouth and try to breathe via the reed valve.
If inhaling is easy and exhaling impossible, the reed valve
is still in a good condition.
Always use a new gasket when mounting the reed valve.
10.76
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