Carburetor Operation The Primer System
(cont’d)
1.
When the tickler valve is depressed slightly,
the inlet needle is unseated.
inlet needle unseated and also opens the
overflow needle.
3.
Pumping the primer pump forces fuel into
the entire fuel system. This action ensures
that the fuel line, diaphragm pump, and main
diaphragm cavity are all filled with fuel.
Note:
If the tickler valve is not fully depressed
during priming, the overflow valve will not
open and fuel will be forced into the car-
buretor throat thereby flooding the engine.
4.
Releasing the tickler valve seats the overflow
valve and the inlet needle. At this point the
engine
is
ready for starting.
2.
Depressing the tickler valve fully keeps the
Carburetor Removal
1.
Remove the
2
screws with flat washers and
lock washers, securing the air cleaner assem-
bly and remove the assembly. See Fig.
17.
Figure
17
2.
Pull from the carburetorthe overflow line and
the fuel feed line. Remove the carburetor with
attached throttle wire. Next, remove the
2
screws with lock washers, that secure the
carburetor onto the intake flange. See Fig.
18.
3.
Remove the intake flange, gasket and
insulators.
4.
Remove the
2
screws securing the intake
assembly to the cylinder and carefully re-
move the intake flange, insulator gasket,
insulator and plate.
Figure
18
IMPORTANT: Before removing the intake
flange, note the position of the pulse orifice
through the flange: this orifice should be
positioned toward the fuel tank as it matches
a corresponding orifice in the carburetor.
The intake flange can be incorrectly po-
sitioned. This will result in fuel starvation.
NOTE:
The screws securing the intake flange
may have become heat seized and difficult to
remove. They can be loosened by firmly
tapping the screwdriver into the screws.
During reassembly, a sparse application of
anti-seize compound to these threads can
prevent future heat seizure.
Carburetor Disassembly
1.
Separate the carburetor from the throttle by
unscrewing the mixing chamber cap and
removing the throttle cable and the attached
throttle valve, needle jet, throttle spring and
spring retainer. See Fig.
19.
Figure
19
2.
Remove the fuel pump by removing the
4
screws with lock washers securing the pump
cover then lifting off the pump diaphragm
and pump cover gasket.
NOTE:
The gasket and the diaphragm are
extremely thin and may stick together giving
13
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