I recently started racing offroad at a local indoor hard surface track, and I got a new in the package Novak GTB 2 (not the one with x-drive) and installed in my Losi xxx-sct, which I got new as a roller. My problem and why I need help is it doesn't always run when I pull the throttle on my radio an older Spektrum DX3.0, the LED lights up with the green, only if I hand spin or nudge the truck it will go. It sorta like when a brushed motor would have a brush hung due to a bad spring., I've checked all wiring and made sure everything was solder cleanly, ( been racing for 25 plus yrs). I've installed 3 Novak ss motors 2 17.5 and a 13.5 and even a Losi 17.5 Xcelorin motor brushless..

Any ideas anyone. I really like the the GTB 2, I have one in my pan car and it works flawlessly, so why am I having problems with my newer one. Could I have settings jacked up wrong in my radio? Trying to figure this out, Help!!

I've had this issue before on a GTB series and on mine it was bad MOSFETs on the board in the ESC. You say you've tried several motors including Novak SS motors, so that pretty much eliminates an issue with a sensor harness since the SS motors all have them hardwired.

So did you replace it??

It was warranty at the time so Novak grudgingly replaced it. Due to the many issues I've had with Novak ESCs and their view of supporting them, I don't run them anymore, though.

OH , I was afraid of that...

What batteries are you using? My experience is that less than a 30C may not perform as expected on Novak ESCs. Also, make sure that the sensor wire is good. Are you using a glitch buster or BEC?

Otherwise, what klaymon said.