10.5T on 3s

The 10.5 im looking at has similar numbers to the novaks, 4200kv. In a slash with 3s lipo, would this be too much. ATM my CC4600 with stock gearing & 2s lipo, gets quite hot. I know alot of you say the CC motors are a little under sized for the slash. But i still want to be able to use this on 2s, & i know the 10.5 will give me good power with stock gearing on 2s...