3 Tekin RX8 systems and no problems so far. I'm getting my 4th one soon. 2000kv on 4s is nice. I don't think u've indicated you're getting one for the buggy or truggy. But Marvin has said. Running lower kv with higher cells will be more efficient and draw less mAh. I personally go for 4s cause I already have many 2s lipos. 1700kv is ideal for 5s. There are guys in the U.S using the Castle 2650kv on 4s for races.
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Current:
Tamiya TT-01D, Tamiya TA-05 IFSR, ABC Genetic, Yokomo Ichiroku M, Spy Car, Caster EX1 RTR, Caster EX1 Pro, Caster F8T Pro, Kyosho ZX-5 SP, Kyosho RT5.
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