MAINTENANCE
- Every 20 hours:
Check the condition and gap (0.7 mm) of the spark plug
Clean the air-filter, the carburettor filter placed at the end of the fuel pipe and the
filter of the fuel tank
Check the torque of every bolt
Tighten head nuts (in cross order) with a Torque Wrench at 2.2 Kg.m (22Nm)
Check the tension and condition of the reduction belt
Check fuel lines
Check the wiring
Check that the cord of the starter has no abrasions
Grease the link-sphere between the manifold and the exhaust pipe with lubricating
copper-grease suitable for high temperature (up to 1100°). If you can’t find it on
the market , please ask to your dealer.
- Every 50 hours
Same controls of the 20 hours and furthermore:
Check the torque of the engine’s crankcase nuts
Change spark plugs
Change the petals of the reed valve
Check the reduction belt and the play of the pulley and change them in case of
need
Check the conditions of the starter gears (version with electric start)
Once a year (independently from flight hours) change the diaphragm of the
carburettor.
N.B. It is advisable to keep records of all maitenance in a log book for the engine. It
is also advisable to install an instrument (CHT) to control the head temperature at
sight.
TENSION OF THE REDUCTION BELT DRIVE - USE CAUTION
Attention: a belt which is “over tensioned” can do permanent damage to the
bearings inside of the pulley hubs and drive shaft. Therefore we strongly suggest
for you to follow carefully these instructions.
Before adjusting the belt take a felt pen or marker and make a small sign on the
cam shaft and on the front of the reduction plate. This is your Zero or start point
and from here you will be able to clearly see how much you move the eccentric
tensioning cam in relation to the reduction plate. Remember “these are Fine
adjustments” and we suggest not to rotate the cam any more than 1 mm per
adjustment. After each adjustment you can try to start the engine and check the
result. If the engine does not start well then it usually means the belt is still too
loose and is slipping - in this case repeat the operation by tensioning the belt
another 1 mm. Consider that if the belt slips a little, but the engine still starts fine,
then the tension is correct. Belt tension always increases automatically when the
engine is running because of thermal expansion in the pulleys. Once you have
found the correct tension , do not adjust it any more. In case of doubts please
contact your paramotor dealer – or JPX Italia.
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