Engine Operation (cont’d)
PORT
Drawing a fresh mixture into the combustion
Figure 91 chamber completes the combustion cycle. The
complete cycle took one full turn of the crankshaft.
8.
The exhaust port is uncovered by the piston and
the exhaust gases are allowed to exit.
See
Figure
92. Engine Removal From Drive Tube
EXHAUST
EXHAUST
GASES
PRESSURE
1.
Pull the spark plug lead from the spark plug.
2.
Pull the ignition switch wires from the rear of the
throttle control grip.
A
needle nose plier may help.
See
Figure 94.
I
Figure 94
Figure
92
3. Remove the
two
screws retaining the throttle
control housing to the drive tube and remove the
9. The scavenger ports are uncovered resulting in a
fresh air/fuel mixture being forced into the
throttle cable from the trigger.
combustion chamber by the crankcase pressure. 4. Pull the throttle cable
Out
of the throttle Control grip.
Note that this process is not 100% efficient and that
5.
Loosen
the
locating
screw
and the clamping
some exhaust gases are
mixed
with the fresh screws. See Fig. 95.
air/fuel mixture.
See
Figure 93.
.-
40
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