Good morning, a few hours ago my engine started with some vivration from 4800 RPM, trying to find the problem, the first thing I do is check the synchronization of the carburetors, and I find that they are very out of synch and now my doubt is okay .

When I  them at low RPM (3000), and proceed to increase the RPM, they de-synchronize again, and the same towards idle, only they de-synchronize in the opposite direction.

I try and there's no way they'll stay in sync throughout the acceleration range. they are undoubtedly accelerating differently. The installation is perfect, the cables are perfect.

The last time I synchronized them they looked good and it was about 20 hours ago.

I have an idea that the diaphragms could be working unevenly, has something similar happened to them?

This is my engine 20 hour ago before being installed in my plane

 This is my motor 20 hour ago

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