The Tekin 2650 motor is great but heir esc's are poor and I have had two that went up in flames that were replaced under warranty. On 4S you cannot go wrong with the Hobbywing xr8 plus 150A esc paired with either their paired G2 2600 kv motor to run fully sensored. Many over here also run with the 2200 kv motor with different gearing but that is about 80g heavier.