19/04/2019
V2.0
Page
12
of
24
5. The run-in and the engine use
5.1 New engine inspection on the ground
Every engine in a new paramotor has been already switched on and initially regulated. Due
to the fact that membrane carburetors are sensitive to changes in atmospheric pressure,
humidity etc., the adjustment of the idle speed might be needed. You should perform the
initial run-in on your back on the ground right before the first flight.
When you start up the cold engine you should briefly warm it up (1-2 minutes) at 3000 rpm.
Then increase it to around 4000 rpm and keep like that for around 30 seconds. Next, you
should check the idle speed, and check how the engine reacts to rapid opening of the
throttle. If the engine chokes you should increase the speed again to around 4000 rpm for
around 30 seconds and try to accelerate once again. If the engine is properly regulated and
warmed-up it smoothly reacts to the changes in position of the throttle. If the engine after
warming-up chokes during rapid opening of the throttle you should enrich the idle speed
mixture by delicately loosening the “L” screw. Contact your local Air Conception
representative if you have any questions. Improper adjustments of the carburetor can lead
to the engine seizing and void the warranty.
5.2 The run-in of the new engine on the ground
After warming-up the new engine you should initially set its speed. In order to do that you
should start up the engine and try to keep the speed at around 4000 rpm for 30 minutes.
After that time, you should increase the speed to 6000 rpm and keep it for around 10
minutes.
Next, you should check whether the engine reacts properly and smoothly to speeding from
idle to maximum. You should also check whether the engine does not choke and does not
have the tendency to cut out.
If you observe any alarming symptoms please contact the distributor or Air Conception
directly.
5.3 The run-in of the engine in the first hours of flight
The run-in during the flight is divided into two stages:
First stage involves making the first take-offs and first flights maintaining the lowest possible
speed. Maximum speed must not be reached unless it is absolutely necessary and it should
take as short as possible. High altitudes are not advisable, but if necessary, they should be
reached in steps, making pauses while ascending in order to cool the engine. We advise you
to maintain high ascent for no longer than half a minute, then keep lower ascent for about
one minute.
The first test flight should take no longer than 10-20 minutes. After landing you
should check combustion conditions by checking the condition of the spark plug.
