Beta Marine Beta 10 Operator's Maintenance Manual page 18

Stopping
Every propulsion engine is fitted with a stop solenoid.
To stop the engine simply press stop push button, hold in
until engine stops, then turn key from 'RUN' to 'OFF' position.
Do not turn the key to the off position when the engine is
running, this will not allow the alternator to charge the
battery.
Warning!
Do not leave the key in 'HEAT' position for more than
15 seconds - this will damage the heater plugs and
eventually lead to poor starting.
21
Stop lever
Speed lever
16
When leaving the boat for an extended period:
• Turn off sea-cock (heat exchanger cooled engines).
• Turn off battery isolator.
Notes for all panel types: Do not depress the stop button
for more than ten seconds as this will lead to overheating
and failure of the solenoid. These engines are equipped with
a mechanical stop lever in the event of electrical system
failure. This lever is located on the starboard side of the
engine above the speed control lever. See illustration below.
Move the stop lever aft to stop the engine then return it to the
run position.