MotoGP rookie Stefan Bradl fell from sixth place two laps before the premature end of Sunday's Malaysian Grand Prix at a drenched Sepang.

The Honda LCR rider revealed all had been going to plan until he modified the engine map to alter the amount of engine braking into the corners.

"First of all we must check the data to understand what happened," he said. "I got a very good start from eighth place, but it was pretty tough out there because of the wet and slippery surface.

"I could lap with a good pace and constant speed but after some laps I had to change the map because we had too much engine brake.

"Since that moment something changed and the engine was pushing me in the corner entries and I did not know what was going on.

"After that I was back to the standard engine brake but it was too much in those difficult conditions and started to be slower.

"In the heavy rain I was more careful, but suddenly when I lost the rear and crashed out. I do not think it was completely my fault and I feel sorry for me and the team."

Bradl heads to the penultimate Australian round holding eighth in the championship, ten points behind Yamaha Tech 3's Cal Crutchlow.