Kunray KR5V V2 New Upgrade Electric BLDC Motor 72V 5000W Upgrade Electric Motor For Razor, Electric Motorcycle, Go Kart Brushless DC Motor Mid Motor

Specifications

Construction Highlights

• Reinforced V2 case, shaft and sprocket mount. The housing and shaft were revised and the sprocket now sits on a larger diameter, so the drive end takes repeated chain load with less flex. Brand codes are engraved into the case, which makes identification and after-sales support straightforward.
• Interior permanent magnet rotor. The IPM layout keeps output steady when current is high, so the motor holds its pull on long climbs instead of fading as it warms up.
• Full copper coil in an aluminium body. As a brushless DC electric motor it has no brushes or commutator to wear out, and the copper windings and aluminium housing move heat away from the rotor without any coolant to top up.
• Phase leads sized for the current. The 8 mm² phase wire gives your controller a clean path for the current these builds draw, keeping voltage drop and heat at the connectors to a minimum.

Machine Fitment

Controller Compatibility

Rotor position comes from a Hall sensor, so pair the motor with a brushless motor controller that reads Hall input rather than a sensorless-only unit. That is what gives clean, quiet starts from a standstill instead of a hesitant launch. Kelly and Fardriver units are both supported, and our own testing runs a 60–100A controller — the NS18-KR72V100A is a common pairing. Reverse is not built into the motor: it is switched on inside the Fardriver app, which is also where current and speed limits are set. If your controller is rated well below what the motor draws under acceleration, it will cut out rather than let the motor reach full output.

Heat Limits & Care

• Stay under 65 °C. 150 °F (65 °C) is the working ceiling — past that the magnets and windings are at risk, so set a temperature-based power cut-off in your controller rather than judging it by feel.
• Keep the case breathing. The housing releases heat into the air around it, so clear packed mud, dust and debris from the cooling surfaces after wet or dusty rides.
• Off-road use only. This electric dirt bike motor is intended for off-road riding, so check your local rules before using it on public roads or paths.
• Post-ride checks. Every few rides, look at the mounting bolts, chain tension and the wiring connections — a loose connection is the usual cause of rough running on high-current builds.

Technical Support & Model Matching

Not sure which motor suits your build? Our team helps you match a brushless motor or complete kit to your voltage, wattage, sprocket type and controller, so the parts work together from the first ride. We can advise on sine-wave controller pairings for Hall motors, sprocket and chain compatibility, and temperature-sensor options for builds that run hot. Need a base-mounted version or a different power rating? Just ask. We also guide installation, wiring and basic fault-finding once your order arrives.