Ros 125 Engine, Components and Elements.
PA125 ENGINE, COMPONENTS AND ELEMENTS
ENGINE
This engine is especially conceived and created for the sport of Paramotoring. It is a
two-stroke monocylinder engine of 125 c.c., high compression, cooled by forced air —
maintaining temperature of the motor at its best—, variable ignition and high performance.
It uses premium-grade petrol with a ratio of 2.5 % (40:1) of synthetic oil per litre. An excess
or lack of oil will damage the operation of your engine. Therefore, it is important to always
use the same oil ratio. Never mix different types of oils. We recommend NOT using petrol
that has been mixed more than 50 days ago, since the oil molecules will break down with
the petrol molecules. We also recommend filtering the petrol when filling up.
PAP recommends CASTROL TTS PREMIX and MOTUL 700.
RUNNING-IN OF THE ENGINE
All engines include a 15 to 20 min running-in on the ground, where they are regulated and the
carburettor mixture is adjusted at sea level. The propeller is checked to be perfectly balanced
and other parts of the Paramotor (clutch, reduction gear, etc.). We recommend warming it up
for 15 minutes over 5000 RPM (in order to not to harm the clutch mechanism) before start flying.
During the first hours, you should not force the engine at its maximum RPM (we recommend
flying on a gentle breeze or meteorological weather to help the engine). Complete running-in is
finished after 5 hours of use (on the ground and/or in the air) with unleaded petrol and a ratio of
2.5%. This ratio should never change during the use of your Paramotor.
If you go through a proper running-in, the useful life of the engine could increase by
100% and any mechanical failures will be minimized. Otherwise, it may suffer from
important and irreversible damages.
The engine regime should change often in a progressive increase. Do not violently apply the
throttle, since the centrifugal clutch will suffer from abnormal loads. Every time before you
start the engine we recommend going through a thorough check so all mechanical parts
work properly. All screws, bolts, and nuts should be checked as well.
Apart from the first 15 min, we recommend doing the running-in by flying, but remember
not to operate at maximum power too often. If you are a heavy pilot, we recommend going
through a 1 hour running-in on the ground before flying.
Revisions and checks during this phase are detailed on section Maintenance, First 5 hours.
If you feel the engine is loosing power, it may be due to a poor carburation because it is not
properly adjusted or because the filter is dirty. Depending on the altitude, you will have to
readjust the carburation in order to avoid it being too poor. It is always recommended that the
engine carburation is richer than poorer; you will therefore avoid the risk of seizing.
After one or two hours of flight, it is important to check the torque of the screws of the cylinder
head (see Maintenance). You will usually notice that the cylinder head is loose because dull
noises can be produced or stains of oil are placed over the cylinder area.
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