I had the same problem with my Yokomo b-max (speedo Tekin RS and SP 6.5t V3).
At this time, I had the 87t spur and 20t/21t pinion.
Now I use the 84t spur and 19 pinion (HobbyWing 120A and SP 6.5V3)
It was better during a month but last week I have smoked the motor (118°C because of too much drag brake).
I will try a LRP 6.5 next week and, in 1 or 2 months, I will install definitively a 6.5 PRT (ptityo)
I will tell you then
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