Black Bull Manual
9
MAINTENANCE
AFTER THE FIRST HOUR OF RUNNING, CHECK THE BELT
TENSIONING, AND IN CASE
RE-TENSIONING IT AT 380/400 Hz
AFTER THE FIRST 2 HOURS, TIGHTEN HEAD NUTS (IN CROSS
ORDER) WITH A TORQUE WRENCH AT 2.5 Kg.m (25Nm).
AFTER THE FIRST 3 HOURS OF ENGINE RUNNING MAKE A NEW
BELT CHECK UP AND IN CASE RETENSIONING IT.
Please note that if you find black dust inside pinion and/or rubber inside
pinion’s groove, it means that belt is not well tensioned and need to be
tightened.
Every 20 hours check:
The condition and gap (0,7 mm) of the spark plug electrode
Clean the air-filter, in case you have a fuel filter before carburetor, clean
it also.
The torque of every bolt
The tension and condition of the reduction belt
Fuel lines and wiring
That the cord of the starter has no abrasions
Every 50 hours check:
Same controls of the 20 hours and furthermore
The torque of the engine’s crankcase nuts
Change spark plug
Change the petals of the reed valve
The reduction belt and the play of the pulley and change them in case
of need
The condition of the starter gears (version with electric start)
Once a year (independently from flight hours) change the diaphragm of
the carburettor
