How do you free-up the slipper gear box on a BMAX4

[LEE-HO]

After racing on Sunday I have been advised I need to get my Car running free, which will help reduce heat. I was told the problem with my car is with the slipper gearbox free ness, and needing making free to stop the heat build up. As any body had this problem and know how to fix it, or how to adhust the setup to free-up the problem.

Note both diff gear set are free.


Thanks

LEE-HO