When the oil gets heated it will smoke. I don't think the leopard 3674 2200 would be good for 6s, that's a high kv for 6s, and that motor is really powerful. I had one and it was a monster on 4s with the m545. I think the leopard 4074 1650kv would be a better suited motor for the revolt and 6s running. But I feel the revolt will be a handful to deal with on 6s with that motor and a 45mm octura prop. But the 1650kv will be well suit for 6s.