Mid Drive Motor Kit

Mid drive motor kit QS138 4000W V3, tailored for e-motorcycle enthusiasts, custom builders, and commercial fleets, it combines a high-power liquid-cooled mid drive motor, a premium controller, a precision speedometer, and an intuitive throttle—delivering a seamless, turnkey solution for converting or building electric light motorcycles capable of reaching 110KPH at 72V.

What’s in the Mid Drive Motor Kit? A Complete Powertrain Solution
The QS138 4000W V3 kit is a carefully curated bundle that eliminates the hassle of sourcing individual components, featuring four core parts:
· QS138 4000W 90H V3 Liquid Cooled Mid Drive Motor: The heart of the kit, a PMSM inner rotor motor with 4000W rated power (13.5kW peak power) and 72V rated voltage. It boasts liquid cooling for sustained high-performance operation, a 1:2.35 gear ratio, and IP67 waterproofing, with a max torque of 120N.m and a flux-weakened speed of 7000RPM.

· EM200-2SP Votol Controller with Enlarged Heat Sink: A sine wave controller with 200A rated DC current and 600A peak phase current, featuring CAN-BUS support, enhanced heat dissipation, and AMP connectors for stable wiring. It offers a max efficiency of ≥92% and IP67 waterproofing, outperforming the standard EM200sp with better cooling and a more compact design.

· DKD LCD Speedometer: A multi-functional display supporting CAN and LIN communication, showing gear positions (D/N/R/P/1/2/3/S), battery current, mileage, and error codes for real-time vehicle monitoring.

· Z6 Throttle: An ergonomic throttle with reverse, parking, 3-speed slide switch, S/boost button, and integrated light/horn controls—streamlining rider operation.


This all-in-one kit redefines convenience and performance for electric motorcycle builds:
Simplified Assembly: Eliminates the need for a gearbox, transmission shaft, or clutch, saving space and reducing installation complexity. Mounted at the rear, it also frees up room for larger battery packs to extend ride range.

High Efficiency & Performance:
The liquid-cooled motor delivers 85–90% efficiency, with regenerative braking to recapture energy and extend battery life. It powers electric light motorcycles to 110KPH at 72V, with robust torque for steep climbs and heavy loads.

Durability & Reliability: IP67 waterproof ratings for the motor and controller ensure all-weather use, while the KTY83/122 thermic probe in the motor monitors temperature to prevent overheating (peak working temp 150°C).

User-Centric Design: The DKD speedometer and Z6 throttle offer intuitive control, with the throttle’s integrated buttons reducing the need for extra switches and the speedometer providing comprehensive vehicle data.

Ideal for Electric Motorcycle Enthusiasts and Builders
Hobbyists & Custom Builders: Creating one-of-a-kind electric light motorcycles with a plug-and-play powertrain solution.
Commercial Fleet Operators: Upgrading delivery or rental electric motorcycles with a durable, high-efficiency system that minimizes maintenance.
EV Tuners: Fine-tuning performance via the EM200-2SP controller’s software, which is compatible with EM150-2 and EM260 controllers for easy debugging and customization.