Toro TC 1000 User Manual

Carburetor Operation Fuel Metering & Mixing
(cont’d)
4. The venturi is the portion of a carburetor
throat that is narrowed in order to increase
air velocity. On the TC1000 carburetor, the
venturi size is variable and is controlled by
the position of the throttle valve. See Fig. 13.
THROTTLE VALVE
Figure 13
VENTURI
AIR CORRECTION JET
properly used, this primer system should not
induce flooding.
The recommended procedure for priming is as
follows: (See Fig. 15)
5. Thevacuum in the venturi area draws the fuel
past the secondary needle jet and into the
carburetor throat.
6. To better atomize the fuel, an air correction
jet was added. The air correction jet allows
filtered air to enter the carburetor throat
perpendicular to the normal air flow. This
action creates turbulence in the venturi area
and helps mix the fuel with air as it enters the
carburetor throat. See Fig. 14
Figure 14
7. The air/fuel mixture enters the engine.
Carburetor Operation The Primer System
The TC100G uses a primer system that ensures
fuel
is present throughout the fuel system. When
CHOKE LEVER
OVERFLOW TUBE
Figure 15
Push the tickler button fully inward.
Manually pump the primer pump until a
small amount of fuel is emitted from the
overflow tube.
Stop pumping the primer pump and re-
lease the tickler valve. The engine is now
ready to start.
The operation of the primer system is
as follows:
See Fig. 16.
DIAPHRAGM
CAVITY
OVERFLOW NEEDLE TICKLER BUTTON
__.-
Figure 16

Toro TC 1000 Specifications

General

Brand	Toro
Model	TC 1000
Category	Trimmer
Language	English