We have detected a series of defective Piston ball bearings on the PA125, it is a small number of series
which were served to us by our supplier and which are defective, as we have had several breaks before the
change that is recommended at 100 hours of use.
For security, we advice to change the bearing on all PA125 engines that were delivered before March 2013.
In these cases of defective bearings, we found that the failure has occurred on engines with approximately 80
hours of use approximate. Only in one case we saw a break in one of 50 hours of use.
Remember that when you change the piston at 100 hours, it is always important to change this bearing piston
to prevent rupture and cause significant damage to the engine.
Remember that with all Walbro carburetors it is very important to check inside Fuel Filter is clean (fig. 4). When this filter becomes clogged when dirty, it makes mixture fuel and air poorly causing, in general, a hole in the piston.
Avoid 95 E10 Gasoline.
We recommend using 98 Unleaded Gasoline only.
Increasingly, we can see in different gasoline stations, the 95 E10 unleaded gasoline. This gasoline
containing 10% ethanol, which is a chemical compound whose use has spread mainly to replace the
petroleum product consumption. For example in France since 2009 you can find at the gas station both
unleaded gasoline unleaded 95and unleaded 95E10.
This compound has a number of advantages and also some disadvantages that directly affect the type of
engines we use to fly with paraengine.
1. - It substantially damages the rubber band of the fuel circuits.
2. - Corrosion of metal parts. Especially in the carburetor, influencing the production of dirt accumulating up in the inner filter of the Walbro carburetors. This can clog and make the mixture of gasoline and air poor until causing a hole in the piston and seizure of the engine.
You can find more information about this on internet engine forums. For our part we echo the importance of
avoiding the 5% or 10% ethanol in unleaded gasoline 95 and use the 98 Unleaded which has less proportion
of Ethanol. We recommend that you use the 98 Unleaded Gasoline for your Paramotor.