KR5V V2 Upgrade: Stronger, Smarter Motor Solution for Electric Dirt Bikes, Go-Karts & More

Looking to power up your ride? Meet the upgraded KR5V V2 Brushless Motor from Kunray. Designed for 72V electric vehicles, this motor is now more durable, installation-friendly, and compatible with a wider range of vehicles—ideal for electric dirt bikes, go-karts, e-motorcycles, and models like the Razor MX500, MX650, SX500, and RSF650.


What’s New in the KR5V V2?

1. Thicker Shaft & Larger Sprocket Diameter for Better Torque
We’ve upgraded the motor shaft from 14mm to 17mm, and the sprocket diameter now goes from 8/10mm to 12/15mm. This means stronger torque stability and enhanced drivetrain durability—perfect for demanding terrains and high-speed rides.

2. Reinforced Motor Housing for Firm Installation
The V2 motor housing now features thicker front and rear case edges, upgraded from 3mm to 8mm. This minimizes vibration and ensures a more secure installation, even in rough or off-road environments.
3. Wider Sprocket Compatibility
KR5V V2 now supports #35 9T / #35 11T / 420 -10T sprockets, making it compatible with both #35 and 420 chains. Whether you’re optimizing for speed or strength, you have more options to customize your setup.
4. Built-in Manufacturer Code for Smarter After-Sales
Each KR5V V2 motor includes a unique manufacturer code engraved on the casing, making it easier for tracking, warranty service, and technical support.

Technical Specifications (unchanged from KR5V):

Brand KUNRAY
Rated RPM 5000RPM 
Peak RPM 8000RPM 
Rated Current 60A
Peak Current 80A-100A
Torque N.m 8.5N.m
Peak w.m 35N.m
Poles 5pair /10pcs
Sensor Hall sensor
TMP Sensor KTY84-130
Class F(155℃)
IP IP54
Cooling Air cooling
Phase wire 8mm²
Sprocket #35 9T/#35 11T/420 -10T
chain #35/420

Where Does It Fit?

Whether you’re building a high-performance electric motorcycle, upgrading a Razor e-bike, or assembling a custom electric go-kart, KR5V V2 offers powerful torque, stronger structure, and greater transmission flexibility to bring your vehicle to life.

Why Choose KR5V V2?

With reinforced mechanics, expanded sprocket options, and built-in identification for smarter servicing, the KR5V V2 motor is a smart upgrade for hobbyists, custom builders, and manufacturers alike.
Ready to ride harder and smarter?
Upgrade to KR5V V2 today and experience the next level of electric performance.

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