What aaron said is exactly right.If you want good performance out of this motor it's usually geared a tooth or 2 higher than OTHER motor's due to being a Torque motor compared to some of today's RPM motor's.
They work great for offroad or smaller onroad tracks and still a favorite amongst some racers.
Goodluck with the motor.Just keep it cut and good brushes and It will work fine.
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Just wanted to say Thanks to RcTech for all these years of Great Information.