I need help to modify my Savage

[Serum]

Welcome.

Who sold you this setup? And did that person knew you wanted to use it in a savage?

Either this 9920 or the basic 4200 will go up in smoke at your first run.

You took a 1/10th scale motor (a quite hot one as well) to run a heavy weight savage. on 14 cells it does about 60000 rpm.

Don't use this setup on your savage. You would be better of in getting an 8XL. this makes it possible to use the stock transmission with the automatic twospeed and the mechanical brake.