Ah, TP4260, cool! Yeah, that's 4292 size and not really comparable to my 4076 Racerstar motor, so I wouldn't worry it's too high kv, especially on 4S. You gonna put the ESC sideways or put it on the Rx position to accommodate the longer motor?
I haven't tried the 1700kv 4076 Racerstar on 4S, I only have 6-8S packs for this scale; I used a Losi spur / center diff to get 13/45 gearing, but with the massive Louise RC MT tires, that's still geared for ~50mph no-load, and the tires are over a pound each, so asking for trouble with small cheap motors.
I was looking at the TP4050/TP4250, as that might still fit without moving ESC, but I'm interested to see how you like your TP4260; might be a better motor for me too, as I never had that much luck with anything smaller than TP4070
2S is for servos, 4S is for minis.