4S
Many 5-inch 4S builds use motors around 2300-2600KV.
Quick reference
6S
Many 5-inch 6S builds use motors around 1700-1950KV.
ESC headroom
ESC current rating should leave room above expected motor peaks.
FPV motors
FPV motor 2207: choosing KV for your build
Motor KV should be chosen together with battery voltage and propeller size. Higher KV is often used with 4S, while lower KV is common for 6S builds.
Compare motors