I used to have a 46 engine in a GP40 piper.
I was so happy with mi 2 strokes engine, but some day I bought a 4 strokes engine, I did install in my plane and start flying. (after all the setup process)
After a few days I did notify some vibration on the engine. (I thought it was normal because the 4strokes) and some friends tell me different thinks because the Prop, because the weather, the fuel, just because, because…..
I change the prop like 10 times, I try balanced, wood, plastic, scratched props, broken, and the vibration still there.

Do you know if this is normal or the engine is bad? Or do you know any way to kill this vibration?

The tail of mi plane is doing a buzzz and the internal rods shake and makes my plane go BBRRRRrrrrrr………

Also I don’t want to sound Exaggerated but the vibration is going into the receiver, I can tell in the battery monitor, how the lights go from one side to other while I do accelerate.