utf8 QSMOTOR 138 4000W Liquid Cooled Mid Drive Motor With Belt Shaft-QS 138 4KW Mid Drive Motor-QS Motor, QSMOTOR, 350W - 14kw High Power Electric Bike Scooter Motorcycle Tricycle Car Wheel Hub Motor leading manufacturers in China | Taizhou Quanshun Electric Drive Technology Co., Ltd.

QSMOTOR 138 4000W Liquid Cooled Mid Drive Motor With Belt Shaft

Price:US $556.00/piece
Production Period:10-12DAYS

QSMOTOR Liquid Cooled 138 4000W 90H 7500W Max continuous 72V 110KPH Mid drive Motor with Better temperature resistance 

For 138 90H motor powertrain kits, it could be used for electric motorcycle, which could be 72V 110KPH.

 e.g. Dirt bike

 E-motorcycle weight, approx 130kg+2*80kg

 Speed: continuous 110km/h

 Gear ratio: 1:2.3*3 (double steps transmission )

 Climbing slope: 30°@208kg

 Battery: 72V52h

 Tire: 0.6138 130/70-17

 P.S. If you have any confused about the shipping cost, please feel free to contact with us.

 Also could place order but don't pay first, then we could adjust the price.


Sales contact: damon@siaecosys.com

Skype: Damon Wong(QSMOTOR)

We Chat:+86 18758618893



One set including below kits 

1. 1pc X QS 138 4kW Liquid Cooled Mid drive motor 


Aliexpress online purchasing link for this motor:  



Key Features

1) Light weight and small dimension compare to hub motor 

2) High performance benefit from flux weakening

3) High efficiency during climbing, and better acceleration  

4) Support regenerative braking

5) Water Cooler, which would have better temp resistance.


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Test Report




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