912 IS engine starts astero and vibrates a lot, then it works perfect

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912 IS engine starts rough and vibrates a lot

"Hello friends, I have a 912 IS placed in a bristell tdo which has 130 hours, since again at the time of start-up it vibrates a lot and has damaged the exhaust system several times, and I checked the battery and voltage of the same in the moment of the start, accelerator to more than 45% and nothing has changed, I would like to know if you can help me?"