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 TM 55-1905-220-14-8
4-7.10A. ENGINE - MAINTENANCE INSTRUCTIONS (Continued)
across the spark plug electrodes. This sequence occurs twice every rotation of the flywheel. The pulser coil
has no effect on the intensity of the spark. Its sole purpose is to signal the capacitor when to release its charge
to the ignition coil.
(1) Combustible vapor from the carburetor is inducted into the crankcase. As one piston reaches the
bottom of its power stroke, the vapor is compressed and forced through the inlet ports into the cylinders. This
action drives out the burned gases which were previously ignited during the last power stroke, and leaves the
cylinder charged with a new supply of combustible vapor. The burned gases are driven through the exhaust
ports into the exhaust system where they are cooled by a spray of water.
(2) As the piston starts its upward stroke, the inlet and exhaust ports are closed, and the vapor trapped
within the cylinder is compressed in preparation for the next power stroke. Engine cooling is accomplished by a
fan which is coupled to a pulley that is driven by a sheave on the crankshaft.
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