Burned Smell at Acceleration

Moin moin, I would need your experience again so I found a burnt smell today after I accelerated about 5 sec in the first gear up to 130+ kmh, from 50-60 kmh. I have to say that I never accelerate my bmw in the first gear so high, but somehow I switched one too far down. The burnt smell was only short there, I am immediately off the gas. But still I don’t know such a smell. If I drive a little faster otherwise s I keep up in the 4 to 5 gears there is zero what. And yes, I’m not so experienced about bikes, that’s why there are such forums. o