a full tank of fuel, the recommended propeller installed,
and a fully-charged booster battery of no more than 1.5 volts
ready for connection to glow plug, proceed as follows to manually
start an engine installed in a plane.
To avoid burning out the glow plug, never use a booster battery
of more than 1.5 volts. The battery is used to heat the glow
plug coil only during engine starting. After the engine has
started and is running smoothly, the booster battery is disconnected.
Heat from the burning mixture in the cylinder keeps the coil
With the booster battery disconnected, turn the needle valve
counter-clockwise 2-1/2 turns from the fully closed position.
With the booster battery still disconnected and with the throttle
wide open, place finger tip over the carburetor inlet and
flip the propeller quickly 2 or 3 times, to prime the engine.
Remove finger tip from the carburetor inlet then close the
throttle to a fast idle setting and again flip the propeller
quickly 2 or 3 times.
Connect the booster battery clip to the glow plug.
Make sure you are holding your airplane firmly to prevent
it from lurching forward when the engine starts. After it
starts, maintain your hold until you have reduced the throttle
to a low idle speed.
Slowly turn the propeller (counter-clockwise) and feel
for a momentary resistance, which indicates ignition of the
mixture in the cylinder.
Quickly flip the propeller to start the engine and then disconnect
the booster battery.
Except for the first hour or so, as noted under Engine
Break-in, adjust the needle valve by turning clockwise
to lean the mixture for full power operation. If the R.P.M.
starts to sag (back-off) you have leaned the mixture too much
and you should then turn the needle valve counter-clockwise
until the R.P.M. picks up and holds steady.