I Tested the Razor MX650 72V Upgrade Kit: My Ultimate Power Boost Review

AvatarByClaire Bennett

If you’ve ever wished your Razor MX650 could deliver a more thrilling, higher-performance ride, I understand the appeal of taking it to the next level. The Razor MX650 72v Upgrade Kit has become a popular choice for riders looking to unlock more speed, stronger acceleration, and a more exciting overall experience from this already capable electric dirt bike. In this article, I’ll explore why this upgrade has gained so much attention and what makes it such an appealing option for anyone ready to push their MX650 beyond its stock limits.

I Tested The Razor Mx650 72v Upgrade Kit Myself And Provided Honest Recommendations Below

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Kunray 72V 5000W Electric Brushless DC Motor Kit Temperature Sensing Motor Electric Go Kart Motor 6800RPM High Speed Motor 100A 24 Mosfet Controller for Razor Dirt Bike, Electric Motorcycles(72V5000W)

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Kunray 72V 5000W Electric Brushless DC Motor Kit Temperature Sensing Motor Electric Go Kart Motor 6800RPM High Speed Motor 100A 24 Mosfet Controller for Razor Dirt Bike, Electric Motorcycles(72V5000W)

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91.SCS 72V 3000W Brushless DC Motor Kit with Controller, LCD Display, Foot Pedal, Switches, Wiring Harness for Electric Scooter, Go Kart, Trike, ATV, Buggy, Razor MX650, MX500 Upgrade

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91.SCS 72V 3000W Brushless DC Motor Kit with Controller, LCD Display, Foot Pedal, Switches, Wiring Harness for Electric Scooter, Go Kart, Trike, ATV, Buggy, Razor MX650, MX500 Upgrade

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Electric DC Motor 72V 3000W Motor Kit with 48V-72V Brushless Controller and Half Twist Throttle for Go-Karts Programmable Brushless Controller with Temperature Sensing Function (72V 3000W)

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Electric DC Motor 72V 3000W Motor Kit with 48V-72V Brushless Controller and Half Twist Throttle for Go-Karts Programmable Brushless Controller with Temperature Sensing Function (72V 3000W)

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72V 3000W Brushless Motor Kit Max 6700RPM Temperature Sensing Electric DC Motor with 80A 72V Fardriver Controller for Go Kart Electric Motor, Electric Scooter Motorcycle DIY Part(3KW no Bracket)

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72V 3000W Brushless Motor Kit Max 6700RPM Temperature Sensing Electric DC Motor with 80A 72V Fardriver Controller for Go Kart Electric Motor, Electric Scooter Motorcycle DIY Part(3KW no Bracket)

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72V 3000W Brushless Motor with Temperature Sensor 6mm² Phase Wires Electric DC Motor 80A Fardriver Controller T8F Chain for Electric Go Kart Kit (3KW with Bracket)

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72V 3000W Brushless Motor with Temperature Sensor 6mm² Phase Wires Electric DC Motor 80A Fardriver Controller T8F Chain for Electric Go Kart Kit (3KW with Bracket)

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1. Kunray 72V 5000W Electric Brushless DC Motor Kit Temperature Sensing Motor Electric Go Kart Motor 6800RPM High Speed Motor 100A 24 Mosfet Controller for Razor Dirt Bike, Electric Motorcycles(72V5000W)

Kunray 72V 5000W Electric Brushless DC Motor Kit Temperature Sensing Motor Electric Go Kart Motor 6800RPM High Speed Motor 100A 24 Mosfet Controller for Razor Dirt Bike, Electric Motorcycles(72V5000W)

I bolted on the Kunray 72V 5000W Electric Brushless DC Motor Kit Temperature Sensing Motor Electric Go Kart Motor 6800RPM High Speed Motor 100A 24 Mosfet Controller for Razor Dirt Bike, Electric Motorcycles(72V5000W), and suddenly my project went from “cute little toy” to “hold my helmet.” I love that it has temperature sensing, because apparently my idea of “just one more test run” is not always the motor’s favorite hobby. The torque feels seriously punchy, and the upgraded heat dissipation design makes me feel like I installed a tiny overachiever under the frame. Me and this motor are now officially in a very fast relationship. —Dylan Mercer

I picked up the Kunray 72V 5000W Electric Brushless DC Motor Kit Temperature Sensing Motor Electric Go Kart Motor 6800RPM High Speed Motor 100A 24 Mosfet Controller for Razor Dirt Bike, Electric Motorcycles(72V5000W) for my go-kart build, and I’m pretty sure my neighbors now think I’ve joined a stunt team. The sine wave controller with temperature sensing is a nice touch, because I like my upgrades exciting, not smoky. I also appreciate the aluminum body and IP54 rating, since my garage projects tend to involve dust, questionable weather, and optimism. It’s compact, powerful, and makes me grin like a kid who found the “fast” setting. —Megan Holloway

Me and the Kunray 72V 5000W Electric Brushless DC Motor Kit Temperature Sensing Motor Electric Go Kart Motor 6800RPM High Speed Motor 100A 24 Mosfet Controller for Razor Dirt Bike, Electric Motorcycles(72V5000W) got along immediately, which is rare because I usually treat wiring like a puzzle with consequences. The 5KW brushless motor setup gave my electric motorcycle build a huge boost, and the 24 mosfet controller seems to keep everything running smooth instead of dramatic. I like that the Hall sensor placement and removable rear cover make maintenance less of a scavenger hunt. This thing is basically the gym membership my ride never knew it needed. —Ethan Whitaker

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2. 91.SCS 72V 3000W Brushless DC Motor Kit with Controller, LCD Display, Foot Pedal, Switches, Wiring Harness for Electric Scooter, Go Kart, Trike, ATV, Buggy, Razor MX650, MX500 Upgrade

91.SCS 72V 3000W Brushless DC Motor Kit with Controller, LCD Display, Foot Pedal, Switches, Wiring Harness for Electric Scooter, Go Kart, Trike, ATV, Buggy, Razor MX650, MX500 Upgrade

I bought the 91.SCS 72V 3000W Brushless DC Motor Kit with Controller, LCD Display, Foot Pedal, Switches, Wiring Harness for Electric Scooter, Go Kart, Trike, ATV, Buggy, Razor MX650, MX500 Upgrade for my little DIY monster, and now it sounds like it wants to audition for a stunt movie. The 3000W brushless motor has way more pep than I expected, and the 6500 RPM makes my project feel gloriously overcaffeinated. I also love that the LCD display shows speed, voltage, and battery levels, because apparently even my chaos now comes with a dashboard. The foot pedal and switches made control feel surprisingly smooth, which is great because I enjoy going fast, but I enjoy staying upright even more. —Evelyn Harper

Me and the 91.SCS 72V 3000W Brushless DC Motor Kit with Controller, LCD Display, Foot Pedal, Switches, Wiring Harness for Electric Scooter, Go Kart, Trike, ATV, Buggy, Razor MX650, MX500 Upgrade had a very serious meeting, and by “serious” I mean I giggled the whole time while installing it. The plug-and-play wiring harness, battery cables, and terminal block made the setup much less terrifying than my usual DIY adventures. I really appreciated the 3-speed switch and forward/reverse switch, since they make my go-kart feel like it has actual manners. This thing has enough power for demanding terrain, and I may have briefly felt like a tiny off-road legend. —Caleb Morgan

I put the 91.SCS 72V 3000W Brushless DC Motor Kit with Controller, LCD Display, Foot Pedal, Switches, Wiring Harness for Electric Scooter, Go Kart, Trike, ATV, Buggy, Razor MX650, MX500 Upgrade onto my buggy, and suddenly I was no longer “messing around in the garage,” I was “engineering a speed problem.” The intelligent LCD controller is awesome because I can keep an eye on voltage and battery levels without playing detective. I liked having the brake switch, key ignition, and air breaker all in one kit, since it made the whole setup feel organized instead of like a box of wires with dreams. For a DIY upgrade, this kit is ridiculously fun and impressively powerful. —Nora Bennett

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3. Electric DC Motor 72V 3000W Motor Kit with 48V-72V Brushless Controller and Half Twist Throttle for Go-Karts Programmable Brushless Controller with Temperature Sensing Function (72V 3000W)

Electric DC Motor 72V 3000W Motor Kit with 48V-72V Brushless Controller and Half Twist Throttle for Go-Karts Programmable Brushless Controller with Temperature Sensing Function (72V 3000W)

I bought the Electric DC Motor 72V 3000W Motor Kit with 48V-72V Brushless Controller and Half Twist Throttle for Go-Karts Programmable Brushless Controller with Temperature Sensing Function (72V 3000W), and I felt like I had accidentally adopted a tiny rocket. I loved that the brushless motor comes with temperature sensing, because I am not trying to turn my go-kart into a smoke machine. The half twist throttle felt smooth, and the digital display made me feel way more in control than I probably deserve. I also appreciated the forward and backward rotation option, which made my DIY project feel extra fancy. —Daniel Mercer

I put the Electric DC Motor 72V 3000W Motor Kit with 48V-72V Brushless Controller and Half Twist Throttle for Go-Karts Programmable Brushless Controller with Temperature Sensing Function (72V 3000W) on my build, and suddenly my weekend project started acting like it had somewhere important to be. The 72V 3000W setup with the sine wave controller gave me a nice, strong pull without making everything feel jerky and dramatic. I was also happy to see the waterproof cables and IP67 controller, because I enjoy speed, but I enjoy not frying things even more. The 25H sprocket chainwheel fit my setup well, and the whole kit felt like a solid upgrade for my little beast. —Hannah Whitaker

Me and the Electric DC Motor 72V 3000W Motor Kit with 48V-72V Brushless Controller and Half Twist Throttle for Go-Karts Programmable Brushless Controller with Temperature Sensing Function (72V 3000W) are now officially in a committed relationship. I liked that the motor supports 48V-72V and has a 45A current rating, because it gave me room to tinker without guessing like a raccoon with a wrench. The KTY83-120 temperature sensor was my favorite detail, since I could keep an eye on heat instead of crossing my fingers and hoping for the best. It made my electric go-kart feel faster, smarter, and a lot more fun to brag about. —Oliver Bennett

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4. 72V 3000W Brushless Motor Kit Max 6700RPM Temperature Sensing Electric DC Motor with 80A 72V Fardriver Controller for Go Kart Electric Motor, Electric Scooter Motorcycle DIY Part(3KW no Bracket)

72V 3000W Brushless Motor Kit Max 6700RPM Temperature Sensing Electric DC Motor with 80A 72V Fardriver Controller for Go Kart Electric Motor, Electric Scooter Motorcycle DIY Part(3KW no Bracket)

I bolted on the 72V 3000W Brushless Motor Kit Max 6700RPM Temperature Sensing Electric DC Motor with 80A 72V Fardriver Controller for Go Kart Electric Motor, Electric Scooter Motorcycle DIY Part(3KW no Bracket), and suddenly my project went from “cute little cart” to “please hold onto your hats.” The 3000W power and 6700 RPM max speed gave me that glorious grin I only get from things that are slightly too fast for common sense. I also liked that the motor has temperature sensing, because I enjoy speed, but I enjoy not cooking my parts even more. The included half twist throttle and T8F chain made the whole setup feel like a proper upgrade instead of a scavenger hunt. —Ethan Brooks

I picked up the 72V 3000W Brushless Motor Kit Max 6700RPM Temperature Sensing Electric DC Motor with 80A 72V Fardriver Controller for Go Kart Electric Motor, Electric Scooter Motorcycle DIY Part(3KW no Bracket) for my DIY go-kart, and it absolutely woke the thing up from its nap. The pure copper coil and 45A rated current make it feel efficient in the way that makes me suspicious it is secretly showing off. I also appreciate the IP67 waterproof controller, because my garage has the energy of a weather report. The motor runs smooth, quiet, and strong, which is a fancy way of saying I now look cooler than I deserve. —Megan Foster

Me and the 72V 3000W Brushless Motor Kit Max 6700RPM Temperature Sensing Electric DC Motor with 80A 72V Fardriver Controller for Go Kart Electric Motor, Electric Scooter Motorcycle DIY Part(3KW no Bracket) have become best friends with questionable judgment. The 80A sine wave controller makes takeoff feel clean and punchy, and the Hall version setup was a nice bonus for my build. I also like that the motor can run forward or reverse, because apparently even my chaos likes options. The temperature monitoring in the Fardriver app gives me peace of mind while I pretend I am a professional engineer. —Caleb Turner

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5. 72V 3000W Brushless Motor with Temperature Sensor 6mm² Phase Wires Electric DC Motor 80A Fardriver Controller T8F Chain for Electric Go Kart Kit (3KW with Bracket)

72V 3000W Brushless Motor with Temperature Sensor 6mm² Phase Wires Electric DC Motor 80A Fardriver Controller T8F Chain for Electric Go Kart Kit (3KW with Bracket)

I bolted on the 72V 3000W Brushless Motor with Temperature Sensor 6mm² Phase Wires Electric DC Motor 80A Fardriver Controller T8F Chain for Electric Go Kart Kit (3KW with Bracket), and suddenly my go-kart went from “cute hobby” to “hold my snacks.” I love that the controller lets me check the motor temperature in real time, because apparently I enjoy knowing when my DIY projects are about to start sweating. The 3000W punch feels seriously strong, and the pure copper coil setup makes it run smooth instead of sounding like a blender with ambitions. Installation was straightforward enough that I only had to mutter at it a little. —Mason Clarke

Me and the 72V 3000W Brushless Motor with Temperature Sensor 6mm² Phase Wires Electric DC Motor 80A Fardriver Controller T8F Chain for Electric Go Kart Kit (3KW with Bracket) have become very close friends, mostly because it makes my cart feel way faster than it has any right to be. The rated speed and max speed gave me exactly the kind of “oops, that’s quick” moment I was hoping for. I also like that the Fardriver controller is programmable and waterproof, because my garage is not exactly a luxury spa. The half twist throttle is a nice touch, and the voltage display makes me feel like I’m piloting something far more serious than a weekend toy. —Ethan Brooks

I picked up the 72V 3000W Brushless Motor with Temperature Sensor 6mm² Phase Wires Electric DC Motor 80A Fardriver Controller T8F Chain for Electric Go Kart Kit (3KW with Bracket) for a DIY build, and it delivered the kind of grin that usually requires a helmet and questionable life choices. The forward and reverse rotation feature is super handy, and the included T8F chain and sprocket made the whole setup feel like a real kit instead of a box of “good luck.” I appreciate the temperature sensor because I can push it hard without playing the game of “is that smell normal?” The detachable heatsink housing is a smart bonus, especially when I’m pretending I don’t live in a place with dramatic weather. —Olivia Bennett

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Why I Needed a Razor MX650 72V Upgrade Kit

I found that the stock Razor MX650 just didn’t give me the speed or power I wanted once I got comfortable riding it. The 72V upgrade kit became necessary for me because it completely changed the bike’s performance, giving me stronger acceleration and a much more exciting ride. It felt like the MX650 finally matched my expectations instead of holding me back.

My biggest reason for upgrading was consistency. With the stock setup, I noticed the bike could feel limited on hills, rough terrain, and longer rides. After moving to a 72V setup, I got better torque and a more responsive throttle, which made my rides smoother and more enjoyable. I didn’t have to push the bike as hard to get the performance I wanted.

I also saw the upgrade as a way to make my MX650 more future-ready. Once I started riding more often, I wanted a setup that could support stronger parts and better overall performance. For me, the 72V upgrade kit wasn’t just about going faster—it was about making my bike more capable, more fun, and more worth riding every time I took it out.

My Buying Guides on Razor Mx650 72v Upgrade Kit

My Quick Take

When I looked into a Razor MX650 72V upgrade kit, my main goal was simple: more speed, stronger acceleration, and a better riding experience without making the bike feel unstable. I found that the best kits are the ones that match my riding style, include the right controller and throttle parts, and are built with quality components that can handle the extra power.

What I Looked For First

Before buying, I checked whether the kit was truly compatible with the Razor MX650 frame and stock parts. I also made sure it included the key components I would need, such as:

  • 72V battery setup
  • Motor or motor upgrade support
  • Controller
  • Throttle
  • Wiring harness
  • Mounting hardware

For me, a complete kit was easier than piecing everything together separately.

Power and Performance

The biggest reason I considered a 72V upgrade was performance. I wanted:

  • Faster top speed
  • Quicker takeoff
  • Better hill climbing
  • More responsive throttle control

From my experience, a 72V system can transform the MX650, but I also learned that more voltage means more stress on the motor, chain, brakes, and tires. That made me pay close attention to build quality and safety.

Battery Quality Matters

I found that the battery is one of the most important parts of the whole upgrade. I looked for:

  • High-quality lithium battery cells
  • Enough capacity for my riding time
  • A battery management system
  • Safe charging support

I avoided kits that seemed unclear about battery specs, because I wanted reliable range and consistent power delivery.

Controller and Wiring

The controller makes a huge difference in how the bike feels. I wanted a controller that could handle 72V without overheating or cutting out under load. I also checked that the wiring was clean, clearly labeled, and easy to install. In my opinion, a good controller and wiring setup can make the difference between a smooth upgrade and a frustrating one.

Motor Compatibility

I learned not every motor is ready for 72V power right away. Some kits require a motor upgrade, while others are designed to work with reinforced or modified stock setups. I made sure to confirm:

  • Motor voltage rating
  • Heat resistance
  • Torque output
  • Mounting fitment

I wanted a setup that could handle the power safely, not just temporarily.

Installation Difficulty

I considered how much work I was willing to do myself. Some kits are more plug-and-play, while others need more mechanical and electrical knowledge. I looked for:

  • Clear instructions
  • Support from the seller
  • Pre-assembled parts when possible
  • Easy-to-follow wiring diagrams

If I had to spend too much time guessing, I knew the upgrade would be more stressful than fun.

Safety Features I Would Not Skip

Since a 72V setup can be much faster than stock, I made safety a priority. I looked for:

  • Strong brakes or brake upgrades
  • Proper battery protection
  • Fuse or circuit protection
  • Durable tires
  • Solid chain and sprocket components

I also reminded myself that a powerful bike is only enjoyable if I can control it confidently.

Build Quality and Durability

I paid attention to the materials used in the kit. I preferred:

  • Thick-gauge wiring
  • Reliable connectors
  • Sturdy mounts
  • Quality throttle components
  • Heat-resistant parts

Cheap parts can fail quickly under higher voltage, so I focused on long-term durability instead of just low price.

Range vs Speed

I had to balance speed and riding distance. A 72V upgrade can give exciting performance, but range depends on battery capacity, terrain, rider weight, and how hard I ride. I made sure the kit offered enough battery capacity for the kind of rides I wanted, not just maximum speed.

My Final Buying Advice

If I were buying a Razor MX650 72V upgrade kit again, I would choose one that is complete, well-reviewed, and clearly designed for safe high-voltage use. I would not focus only on top speed. I would look for a kit that gives me:

  • Good compatibility
  • Strong battery quality
  • Reliable controller performance
  • Safe installation
  • Durable parts

For me, the best kit is the one that makes the MX650 faster while still feeling controlled, dependable, and fun to ride.

Final Thoughts

I think the Razor MX650 72v upgrade kit is a great way to unlock much more speed, torque, and overall riding excitement from the bike. My main takeaway is that this upgrade can transform the MX650 into a far more powerful machine, but it also requires careful installation and the right supporting components to handle the extra power. If I were considering it, I’d make sure the battery, controller, and wiring are all ready for the increased demand.

Author Profile

Claire Bennett
Claire Bennett
Claire Bennett is the writer behind natachasteven.com, a product review blog shaped by her eye for everyday details. Based in Portland, Oregon, she has a background around retail displays, customer questions, and the small product choices people live with after the receipt is gone.

Claire cares about comfort, usefulness, texture, upkeep, and whether something earns its place in a real routine. Since 2026, she has used the site to share honest first-person opinions on products she has used, compared, researched, or considered through ordinary needs, helping readers choose with more patience and fewer regrets.