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Hi, I write from Italy. I have a Fendt F28 to which I have changed the cylinder, piston rings and piston and checked the valves and head, which has also been repaired with a weld on the exhaust valve of cylinder 1. Unfortunately it still struggles to start as before doing the job and once Party makes a lot of smoke as per attached photos, the same one he always did before doing the work. Except that before he had a poor compression and with the winter he could not even leave. Now once in motion and warmed up, the engine runs fairly smoothly, with a few crackles every so often only in the first few minutes of operation, but it always makes the same amount of smoke both hot and cold. Abnormal consumption of water or oil is not known. The oil put is new and it is a 15W40. What can be the cause? Possible is the clogged air filter that causes oil suction in the cylinder from below. Or an injection problem? The injectors have been checked and calibrated at 100ATM. Can anyone help me? Thank you