Would this work?
 

I have a spare motor and a spare speed controller. The only problem is that the motor is a 18th scale Dynomite C4 9200kv and the controller is a BK 9920.
Over kill on the contoller I know but would it work?

It most certainly would.

that will work Johnny.

Thanks, I'll give it a shot.

Ok, that's not working out so well.
I give it a little throttle (maybe 5-10% and it works fine. If I go any more than that, it starts to pulse. On, off, on, off, on, off and motor starts to get warm. Tried it with a 2s and 3s...didn't make a difference. I am not running a ubec. Left the black jumper in. I did not hear any beeps when I programmed it.
What the heck?

Possibly rpm too high for the 9920? Was the motor unloaded?

9920 can only take 40K rpms right?...

Yeah that's it. I was gonna say you need to keep the voltage under like 5 volts or it will over-rev the 9920. I believe the limit is 42k. That's a 1S motor! :lol:

Hmm, my buddy runs an 8XL with a 9920 on 6S in testing on the stampede. That is over 42K rpms I thought.

maybe not under load?

I believe with a 2 pole motor the esc's limit is 100k

I thought a 9920 would not run anything more then a 2 pole. I had understood it will not work with a Neu 4 pole.

I think your right, but the instructions for my 7020 say 2 pole motors 100k, 4 pole 50k. ????

Maybe mine is an old version? It's actually a 12020, but same firmware. It had a 42K 2-pole limit. I ran a Lehner XL2800 on 4S and hit the rev limit at 3/4 throttle. It wasn't pretty.

It should be 100K for 2pole. I have the 3695 and it only goes to 42K.