motor138MOTOR138 QS PMSM 4KW 90H V3 Mid Drive Motor With Internal Gearbox With 12.35 Reduction Ratio Inside, with 6500-7000rpm.. Application: e.g. Dirt bike. E-motorcycle246.4K1w ago. jratscustoms. Thomas Tyler. Those fat wheels!!! Electric Honda ruckus running a QS motor 138 belt drive 72v battery 200amp