Carburetor Operation The Primer System (cont’d)
MAIN
DIAPHRAGM
CAVITY
OVERFLOW
NEEDLE
TICKLER
BUTTON
Figure
15
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 carburetor 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.
Carburetor Removal
1.
Remove the
two
screws with flat washers and lock
washers, securing the air cleaner assembly and
remove the assembly. See Figure
16.
2.
Pull from the carburetor the overflow line and the
fuel feed line. Remove the carburetor with attached
throttle wire. Next, remove
the
two
screws with
lock washers, that secure the carburetor onto the
intake flange. See Figure
17.
Figure
17
3.
Remove the intake flange, gasket and insulators.
4.
Remove the
two
screws securing the intake
assembly
to
the cylinder and carefully remove the
intake flange, insulator gasket, insulator and plate.
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 positioned.
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
Figure
18.
Figure
16
14
Figure
18
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