O.S. engine MAX-25LA Owner's Instruction Manual page 28

Symptom Factor
2
Engine fires
intermittently but
3
does not run.
1
2
Engine fires once
or twice, then
fails to fire.
3
Engine starts but
3
revolutions decrease
and engine eventually
stops.
3
Engine starts,
then revolutions
increase and
engine cuts out.
3
Engine stops when
battery leads are
2
disconnected after
starting.
Cause
. . . . .
Incorrect heating of
glowplug.
. . . . . . . .
Over priming.
. . . . . .
Sluggish rotation.
. . . . . .
Glowplug battery
discharged.
. . . . .
Insufficient priming.
. . . . . . .
Mixture too rich.
. . . . .
Fuel not reaching the
engine.
. . . . . . .
Mixture too rich.
. . . .
Mismatch of glow plug and
fuel.
Corrective action
Voltage too high or too low. Re-check and readjust referring to "BEFORE
STARTING" paragraph 4.
Continue flipping propeller. If engine does not start after more than 10 flips,
disconnect battery from glowplug and leave for a few minutes, then re-
energize plug and flip prop again. If engine still does not start, remove
glowplug and pump out excess fuel by flipping prop quickly.
Then re-start. (Priming is not necessary.)
Recharge the electric starter battery.
Recharge lead-acid cell or replace dry battery.
(Note: An unused, or almost unused, dry battery may sometimes be of
insufficient capacity if it is "old stock".)
Repeat priming procedure referring to
Close needle-valve half turn (180˚) and wait for several minutes then re-
start.(Priming is not necessary.)
Make sure that tank is filled with fuel. Check that there is not something
wrong with fuel tubing (kinked or split). Check that carburettor is not
clogged with dirt.
Close the needle-valve a little.
Change fuel or glowplug.
27
8 Priming.