QS 138 90H Water-Cooled Mid-Drive Motor | High-Performance Electric Motorcycle Motor

The QS 138 90H Water-Cooled Mid-Drive Motor is engineered for extreme electric motorcycle and high-power EV applications. Featuring an advanced liquid cooling system, this motor maintains optimal operating temperatures under heavy loads, enabling consistent performance, higher sustained power, and longer motor life.

Designed for electric dirt bikes, electric motorcycles, and custom high-performance builds, the QS 138 90H water-cooled version delivers exceptional torque, smooth power delivery, and superior thermal management—making it the ideal choice for riders who push their machines to the limit.

Key Features

• Water-Cooled Design: Superior heat dissipation for sustained high-power output

• High Torque Performance: Excellent acceleration and hill-climbing capability

• Mid-Drive Motor Layout: Optimized weight balance and drivetrain efficiency

• Heavy-Duty Construction: Built for demanding off-road and street applications

• Performance EV Ready: Ideal for racing, long rides, and high-load usage

• Wide Compatibility: Suitable for electric motorcycles and custom EV builds