Kraton Issue with my Kraton

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Rotamanx

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Hi guys
an unusual one, I upgrade all of my kratons arms to RPM racing ones, reassembled all good took it for a spin and there seems to be something grinding as the wheels don't move freely and the car comes to a stop when you let off the gas and doest roll to a stop anymore, the other thing that happened was after a few passes the car stopped the red light on the ESC was flashing I thought the battery was dead so i left it on for the motor fans to cool the motor down, then I think I messed up the starting sequence cause I turned the car off then on and it shot up to full RPM bouncing off the walls in my garage!!!! even though I didn't touch the trigger on the controller??

The only thing I can think of is the position of the motor mount is too close. I had to buy a new pinion gear as I lost my old one, I bought the genuine one below. any suggestions would be appreciated

Video to the noise Im referring to​



Part I used below​

ARRMA Steel 12T 1Mod Safe-D5 Pinion Gear​

 
Also further to the above no changes where made to drive gear or diffs
 
take your motor out run the car on the ground should roll smooth then check motor that should spin easy
 
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