The motor is rated for 3200rpm @ 24V. At 36V, the motor will spin proportionally faster, so 4800 rpm. I sized my pulleys the same as the original gas engine. According to reading and talking with people, most small engines run 2500-3400 rpm (feel free to correct me here, I haven't got anything incredibly solid). So, if I drop back down to 24V, I should be right in that range. Otherwise, I am going to need smaller pulleys to get the drive and mower deck speeds back down.
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