Carburetor With Compensator - Stihl Cutquik TS 460 Service Manual

STIHL TS 460
10.2 Structure and
Function of the
Carburetor with
Carburetor without compensator
The carburetor with compensator
maintains a constant fuel ratio
during carburation regardless of
how dirty the air filter is. The
pressure on the clean side of the
air filter and at the metering
diaphragm is constant.
The manifold for the air filter is
equipped with a hose. When fitted
to the connectors on the cover on
the regulator side, it forms the
connection between the metering
diaphragm chamber and the clean
side of the air filter.

Carburetor with compensator

When the air filter is dirty, the
quantity of air is reduced. This,
however, causes a drop in
pressure not only in the venturi of
the carburetor, but at the outside
of the metering diaphragm as well.
The metering diaphragm moves
upward, the inlet needle closes
partially, thus reducing the flow of
fuel.
The combustion mix can no longer
become too rich; it is no longer
necessary to readjust the high
speed adjusting screw as the filter
becomes dirtier. Performance is
reduced, however, due to reduced
volume of air. Optimum
performance can only be regained
by cleaning the air filter.
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