I have a question for the forum. Today was my first outing in a year and a half and I was running USGT with a SpeedPassion Reventon R and the Fantom FR-1 21.5. When I hit the throttle from a dead start, the motor seemed to cog but once it got going it seemed ok. I changed sensor wires and it still did it. In the mains I hit that throttle at the start and it moved about an inch, stopped, I let off the throttle then on again and it went. Is this a motor problem or a ESC problem? It was very aggravating. I also asked this question in the Fantom thread too just to try to find some answers.