Hello Mavros

The engine has about sixty 15-minute flights. It worked very well with an APC 21.5 x 10.5 PNC propeller, very powerful.
Then I saw traces of fuel at the cylinder head.
The one was porous and YS replaced it with a new one under warranty.
Since the engine has less power while I only changed the cylinder head.
I have done a lot of checking but the problem still persists.
It's very very weird.
Claude