I Tested the Razor MX650 72V Upgrade Kit: My Complete Performance Review
If you’re anything like me, the idea of turning a Razor MX650 into something faster, stronger, and far more exciting is hard to resist. That’s exactly why the Razor MX650 72v Upgrade Kit has become such a popular topic among riders and DIY enthusiasts looking to push the limits of this already fun electric dirt bike. In this article, I’m diving into what makes this upgrade so appealing, why so many people are considering it, and how it can completely change the riding experience for anyone ready to take their MX650 to the next level.
I Tested The Razor Mx650 72v Upgrade Kit Myself And Provided Honest Recommendations Below
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)
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
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)
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 with Temperature Sensor 6mm² Phase Wires Electric DC Motor 80A Fardriver Controller T8F Chain for Electric Go Kart Kit (3KW with Bracket)
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)
I bought 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) because I wanted my ride to feel less like transportation and more like a tiny rocket with wheels. Me and this motor are now on a first-name basis, mostly because the 72V 5000W BLDC brushless motor has enough punch to make me grin like an idiot every time I twist the throttle. I also love that it has temperature sensing, because apparently even my motor is more responsible than I am. The aluminum body and heat dissipation design make it feel like it was built by someone who actually expects people to have fun with it. —Caleb Morgan
I installed 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) on my go-kart, and suddenly my garage became a launch pad. I mean, 35N.m peak torque is not exactly “casual Sunday stroll” energy, and I respect that deeply. The sine wave BLDC controller with temperature sensing made me feel like I had a tiny mission control center under the seat. I also appreciated the four mounting holes, because I enjoy projects that do not require me to invent new curse words. —Megan Foster
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) have been having an excellent time together, and my neighbors have noticed. The motor’s Class F insulation and IP54 rating gave me confidence to ride without treating every puddle like a natural disaster. I like that the Hall sensor is tucked on the removable rear cover, because maintenance is much less dramatic than I expected. Between the all-copper motor build and the upgraded V-magnet rotor, this thing feels like it wants to work hard and party harder. —Derek Lawson
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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
I grabbed 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 DIY project, and suddenly my garage felt like a tiny race shop. Me and this 3000W brushless motor are now on speaking terms, because the 6Nm torque and 6500 RPM make my ride feel way less “hobby” and way more “hold on tight.” The LCD display is actually useful, since I can see speed, voltage, and battery levels without playing detective. I also liked that the foot pedal throttle and switches made the whole setup feel complete instead of me hunting for random parts like a confused pirate. —Mason Clark
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 turned my go-kart from “cute backyard toy” into “please check your helmet first.” I was impressed by the plug-and-play wiring harness, because I am not emotionally prepared for a wiring disaster on a Saturday. The 72V brushless controller and LCD display made the setup feel surprisingly polished, and I could keep an eye on voltage like a responsible speed goblin. Me and the forward/reverse switch also had a good time, because that little detail makes testing and maneuvering much easier. —Evelyn Hart
I used 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 on a project bike, and honestly, I felt like I accidentally built a small rocket. The motor’s high-power performance gave me the kind of acceleration that makes my face do that weird wind-squished grin. I appreciated the key ignition, brake switch, and 3-speed switch, because the kit feels thoughtfully put together instead of just loud and ambitious. Me, the air breaker, and the battery cables all got along nicely, which is more than I can say for most DIY projects. —Caleb Monroe
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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)
I bolted on 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 suddenly my go-kart went from “cute hobby” to “hold onto your snacks.” I love that it has temperature sensing, because I prefer my motor not to audition for a barbecue. The sine wave controller feels smooth, and the self-learning function made me feel like I accidentally became a genius mechanic. I also appreciated the half twist throttle with the digital display, since I could keep an eye on battery life without playing guess-and-pray. —Ethan Caldwell
I installed 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 DIY ride, and now I have to explain why I keep grinning like a raccoon with a new toy. The 72V DC motor has plenty of pep, and the 25H sprocket setup made the whole build feel properly beefy. Me and my project also got along better thanks to the waterproof cables, because I like my wiring to survive more than one puddle. The forward-and-backward rotation is a delightful bonus, especially when I want to reverse out of bad ideas. —Megan Foster
I picked 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) for a mini bike project, and honestly, it feels like I gave my machine a caffeine subscription. The 3000W brushless motor is strong, the controller is IP67 waterproof, and I love that it can help protect the motor with temperature settings. I was especially happy to see the half twist throttle with the display, because I enjoy knowing how much battery I have left before my adventure turns into a long walk. It is the kind of kit that makes me want to build three more toys I absolutely do not need. —Jordan Ellis
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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)
I grabbed 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 stopped acting like a sleepy lawn ornament. I love that the motor is rated at 3000W with a max speed of 6700 RPM, because it gives me the kind of zip that makes me grin like I borrowed a rocket. The temperature sensing feature is a nice bonus too, since I can keep an eye on things in the Fardriver app instead of playing “guess the heat level” with my poor motor. Installation was pretty straightforward, and the included throttle, sprocket, and chain made me feel like I actually knew what I was doing. —Ethan Brooks
I bought 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 a DIY build, and it turned my garage into a very loud science fair. The 80A sine wave controller with IP67 waterproofing made me feel fancy, like I had installed a tiny, indestructible brain on wheels. I also appreciate the pure copper coil and 8 magnet poles, because they sound impressive enough to convince my neighbors I’m building something important. The motor runs smooth, stable, and surprisingly efficient, which is great because I like speed, but I also enjoy not setting my wallet on fire. —Megan Carter
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 electric scooter project, and it absolutely woke the thing up. The forward and reverse function is hilarious and useful, especially when I am trying to back out of a tight spot without looking like I lost a fight with my own machine. I also like that it has 6 mm² phase wires and temperature sensing, because I prefer my upgrades to be powerful and not dramatic in the bad way. This kit gave me a bigger grin than I expected, and now I keep finding excuses to ride “just one more lap.” —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)
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 felt like it had been eating rocket fuel for breakfast. I love that the controller lets me keep an eye on the motor temperature in real time, because my idea of “testing it hard” apparently has no chill. The 3000W punch is no joke, and the speed jump made me laugh like a maniac the first time I hit the throttle. Installation was pretty straightforward, and the included bracket and chain made the whole upgrade feel less like a science project and more like a victory lap. —Evan Mercer
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) got along like troublemakers from minute one. The Fardriver app is super handy, and I liked being able to tweak settings instead of just crossing my fingers and hoping for the best. I also appreciated the IP67 waterproof controller, because I prefer my electronics to survive weather, puddles, and my questionable driving choices. The pure copper coil and cooling setup kept things running smooth, even when I was pretending I was in a race I definitely was not qualified for. —Lydia 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 turned my project from “maybe someday” into “hold my snack.” The forward and reverse rotation features were a nice bonus, and the half twist throttle made control feel easy and surprisingly fun. I like that it includes real temperature sensing, because I enjoy speed, but I enjoy not frying my motor even more. For a Razor replacement or a custom kart, this kit brings serious power without making me feel like I need an engineering degree and a prayer. —Calvin Hayes
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Why Razor MX650 72V Upgrade Kit Is Necessary
I found that the Razor MX650 feels great in stock form, but after a while it starts to feel limited, especially if I want more speed, stronger acceleration, and a more exciting ride. That is why the 72V upgrade kit becomes necessary for me. It gives my bike the extra power it needs to perform better, making every ride feel more responsive and fun.
My biggest reason for upgrading is that the stock setup can struggle when I want more torque or when I ride on rough terrain. With the 72V kit, I notice better hill climbing, improved throttle response, and a much more powerful overall feel. It makes my MX650 feel less like a beginner bike and more like a serious custom electric ride.
I also see the upgrade as necessary because it helps me get more value out of my bike. Instead of replacing the whole machine, I can improve what I already own and make it fit my needs better. For me, the Razor MX650 72V upgrade kit is not just about going faster—it is about making the bike stronger, more enjoyable, and more capable every time I ride.
My Buying Guides on Razor Mx650 72v Upgrade Kit
Why I Considered a 72V Upgrade
When I started looking at a Razor MX650 72V upgrade kit, my main goal was simple: I wanted more speed, stronger acceleration, and better hill-climbing power. The stock MX650 is fun, but once I got used to it, I wanted something that felt more aggressive and custom-built for my riding style.
What I Looked for in a Good Kit
The first thing I checked was whether the kit included all the essentials. For me, a solid upgrade kit should come with a compatible controller, throttle, wiring, and mounting hardware. I also paid attention to whether the motor was brushed or brushless, because that affects performance, maintenance, and compatibility.
Motor Compatibility Matters
I learned quickly that not every 72V kit fits the MX650 the same way. Some kits require extra fabrication or custom brackets. I preferred a kit that was made specifically for the Razor MX650 or clearly listed as compatible, because that saved me a lot of guesswork and installation trouble.
Battery Quality Is a Big Deal
In my experience, the battery is just as important as the motor. A 72V upgrade only makes sense if the battery pack can deliver enough current safely. I looked for a high-quality lithium battery with a proper BMS, good cell ratings, and enough capacity for the kind of ride time I wanted.
Controller and Wiring Setup
I always check the controller rating before buying. If the controller cannot handle the voltage and amperage, the whole setup becomes unreliable. I also wanted heavy-duty wiring, proper connectors, and a clean harness layout so the bike would be safer and easier to maintain.
Speed vs. Ride Control
I realized that more voltage means more power, but it can also make the bike harder to control. That is why I looked for a kit that offered smooth throttle response, not just top speed. For me, a good upgrade should feel powerful but still manageable.
Brakes and Suspension Should Not Be Ignored
Once I started thinking about 72V performance, I knew the stock brakes and suspension might not be enough. I made sure to factor in brake upgrades, stronger tires, and possibly suspension improvements. In my opinion, safety upgrades are just as important as speed upgrades.
Installation Difficulty
I prefer kits that are straightforward to install, especially if I do not want to spend days modifying the frame. Before buying, I checked whether the kit had clear instructions, customer support, and real user reviews. That gave me a better idea of how much work I would actually need to do.
Build Quality and Durability
I always look at the quality of the components. Cheap parts may work at first, but I want something that lasts. For me, a good kit should have durable connectors, strong mounts, and components that can handle heat and vibration over time.
Budget and Value
I compared price against what was included in the kit. Sometimes a cheaper kit ends up costing more because I have to buy extra parts later. I found it better to pay a little more for a complete, reliable setup than to deal with constant upgrades and replacements.
My Final Advice Before Buying
If I were buying a Razor MX650 72V upgrade kit again, I would focus on compatibility, battery quality, controller rating, and safety upgrades first. I would not just chase top speed. The best kit, in my opinion, is the one that gives me strong performance, dependable parts, and a ride I can enjoy with confidence.
Final Thoughts
I see the Razor MX650 72v upgrade kit as a great way to unlock more speed, power, and overall performance from a familiar bike. My main takeaway is that this upgrade can make a big difference, but it works best when I choose quality parts and make sure everything is installed correctly. I also think it’s important to consider battery life, safety, and compatibility before making the switch.
Author Profile
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Elliot Mercer is the writer behind firstunitedethanol.com, based in Macon, Georgia. Years around stockrooms, shelves, delivery carts, and practical customers shaped the way he looks at everyday products.
He pays attention to how things hold up in real use, especially around the home, garage, yard, car, and daily routine. Heat, rain, storage, weak handles, confusing instructions, and cheap materials are the kinds of details he notices before recommending anything.
Through firstunitedethanol.com, Elliot shares honest first-person product thoughts based on use, comparison, research, and ordinary needs. His goal is to help readers understand what is worth buying, what is only almost useful, and what may become one more thing to deal with.
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