Ok...I decided I just HAD to put a different motor in my stock KS P-90.
Although the previous motor was fine I decided to see what if...
While the motor housing was apart I left, only to return to see my 2 year old nephew playing with the gearbox. I regained control from him, shooed him off to his mom and inspected the gearbox, and my work area, all good.
I swapped in a TM hyper 1000 motor and closed it up. After reassembly of motor housing to gearbox, I put power to it and could hear the pinion grinding. So I adjusted the motor adjuster little by little until it stopped...literally!
I backed it off and the motor will work, BUT once engaged enough to mesh the gears, it will not work the gearbox.
I swapped back to stock, same thing. I adjusted it, same.
Power is connected correctly.
The gears seem to be spinning freely inside gearbox with the motor housing "lowered", sooooo...?
Could the timing be off from rotating the gears? (I doubt it due to the gearbox not being opened)
I also don't see any "extra additives" that my nephew could have inserted.
What am I overlooking?