I am new to the Rotax world. I have about 40 hours on a 912S big bore. I normally preheat the tank to about 70F . I pull the prop through about 15 turns . Battery normally reads 12.2 volts . I use the cold start procedure and engage using one mag. The last few times I’ve been getting a “clunk “ when I engage and immediately release. This will happen about 3 or 4 try’s then eventually does turn over. Is this normal ? Any advice ?
