Has anyone had problem with dirt coming into a gas engine via the carburetor and destroyed the cylinder.
I have an engine that has got a scratched cylinder and the seller says that an object that has come from the outside has damaged it. I believe it has been damaged by a part from a broken bearing.
The engine has a rear carburetor.
I fly from a grass field but I have never thought that an air filter is needed. Expecially with an engine that has the carburetor inside the fuselage.
Maybe I am wrong but few people seem to use air filters.