Evinrude 4906B 4HP 1969 Owner's Manual page 166

ignition system. The switch is actuated
vacuum from the cylinder.
vacuum pull is exerted against the switch,
during engine operation in gear without the
lower unit in the water, the switch is closed
and the engine is shut down. This feature is
a safeguard against
away" while operating with a no-load condi-
tion on the propeller.
will continue to increase
load condition and attempts
will fail, resulting
destruction of the unit.
The vacuum switch also serves as a safe-
ty fea ture when the boat is operating in the
water. If the propeller is released from the
When a high
the engine "running
A two-cycle engine
rpm under a no-
to shut it down
in serious damage
Exploded view
shaft, because of an accident,
by
underwater
would then be operating
condition.
down the engine and prevent extensive dam-
age, resulting from a "run-a-way" condition.
This cutout switch arrangement
stalled on all 28, 33, and 35 hp engines,
1958-59, and all 40 hp engines covered in
this manual.
Therefore,
or spark plug, disconnect
vacuum switch and again test for spark at
the spark plug. If spark is present with the
vacuum switch disconnected,
defective and must be replaced.
of a "run-e-way"
cutout switch installed
TROUBLESHOOTING
striking an
object, whatever, the
under a no-load
The vacuum switch
if spark is not present at the
the wires from the
the switch is
on
late-model
5-7
engine
will shut
was in-
engines.