Here is my experience with transmission fluid levels. I did a rebuild this past winter on my K9B and used this thread as a resource for the amount of transmission fluid to use. I put in the 500ml and the motor didn’t seem to have the same over rev or mid and top end power. Spoke to another competitor and Joey from Overdrive and dropped that transmission fluid down to 300ml. The motor has now come alive on the top end and is very snappy.