We had a very sucessful first outing with the new Speedpassion Spec Stock ESC and motor combo. Our club has split the 17.5 class into expert and sportman so I figured i'd get a combo pack for my Mi4 that I sponsor a local girl with. This combo has great all around power, good bottom end, mid range and top end, I wasn't sure what to gear it at, so i started a little lower then whats normal for a 17.5, (well what used to be normal) the Mi4 has a internal of 1.8 so i geared it 106/49, after the first race it came off at 78 degrees and thats a 6 minute race. next heat geared it up, 106/51, still cool to the touch and still under a 100degrees, 3rd heat geared it up to 96/49 motor came off at 112 degrees, so up again in gearing for the main, 96/51 motor temp 128, set fast lap of the race and finished second after a rough start sent her to the back of the pack on the start.