D-MOTOR LF39 - Trouble Shooting; Engine Does Not Fire; Warm Engine Shows Irregular Idling

The Light Weight Engine Houtekietstraat 11
B-8540 Deerlijk, Belgium
EFFECTIVITY page 39
ALL 19-3-2019
• Check the liquid coolant mix is suitable to cope with an outside air temperature of -36
deg C.
In Countries with extremely low temperatures it is recommended to protect the battery
against freezing by keeping it in a warm location for storage between flights.
Cold starting procedures
Throttle OFF
Limit cranking the engine for periods longer than 10 sec. After the engine starts, keep the
engine running but do not exceed 2000 RPM until the oil temperature reaches 50 deg C (122
deg F).
TROUBLE SHOOTING
Engine does not fire
Cause
Action
Ignitions OFF
ON.
Spark plug gap too big
Change plugs or re-gap plugs.
Fuel shutoff valve OFF or fuel filter blocked
Fuel shutoff valve ON, clean or replace fuel filter.
Lack of fuel
Fill fuel tank.
Ignition line loose or damaged
Check line connections.
Replace if necessary.
Battery defective or discharged
Install charged battery or recharge.
Starting speed too low, start problems
Check battery.
Spark plugs wet from condensation
Dry plugs inside and outside.
Spark plugs wet with fuel (over-choked)
Dry spark plugs.
Inner mechanical defect
Contact engine manufacturer or approved
service centre.
Warm engine shows irregular idling