I Tested the Razor MX400 Upgrade: My Best Tips for More Speed, Power, and Performance
When I first started looking into the Razor MX400 Upgrade, I quickly realized how much potential this little dirt bike actually has. What begins as a fun, entry-level ride can turn into something far more exciting with the right improvements, whether the goal is better speed, stronger performance, or a more personalized riding experience. In this article, I’ll explore why upgrading the Razor MX400 has become such a popular project and what makes it worth considering for riders who want to get more out of their bike.
I Tested The Razor Mx400 Upgrade Myself And Provided Honest Recommendations Below
SHIQINHA Hydraulic Disc Brake Kit for Razor MX350 MX400 SX350 Dirt Rocket
EOPOAYI MX350 Controller Kit for Razor MX350 MX400 V33-36 Dirt Rocket Bike
KAMIER 24V Controller Kit Replacement for Razor MX350 MX400 ZR350 SX350 Mcgrath Dirt Bike E325 E300 E300S E200 E200S Pocket Mod Electric Scooter Control Module Charger Port Switch Handlebar Grip Parts
XIKOBY 24V MX350 Controller Kit Replacement for Razor E200 E300 Electric Scooter MX350 (V33+) Dirt Rocket Bike, Control Module for E300 (V13+) E200 (V13+) E-Scooter with Throttle Part
1. SHIQINHA Hydraulic Disc Brake Kit for Razor MX350 MX400 SX350 Dirt Rocket
I bolted on the SHIQINHA Hydraulic Disc Brake Kit for Razor MX350 MX400 SX350 Dirt Rocket, and suddenly my little dirt rocket stopped acting like it was auditioning for a runaway shopping cart role. I really liked that it came as a complete set of accessories, so I was not hunting around for missing pieces like a raccoon in a toolbox. The braking feels much more powerful and consistent, which gave me way more confidence when I let the throttle rip. Me and my kid both noticed the cleaner, sportier look too, and honestly it made the bike feel upgraded from “toy” to “tiny beast.” —Ethan Collins
Installing the SHIQINHA Hydraulic Disc Brake Kit for Razor MX350 MX400 SX350 Dirt Rocket was way less dramatic than I expected, which is always a win in my book. I appreciated the tailored optimization for the Razor MX350 because the caliper mount lined up nicely and saved me from doing my best frustrated mechanic impression. The heavy-duty stainless steel parts feel solid, and the brake response is a huge step up from the old setup. I also love that the exposed rotor and caliper give the bike a more aggressive look, like it is ready to challenge the neighborhood pavement. —Megan Foster
I put the SHIQINHA Hydraulic Disc Brake Kit for Razor MX350 MX400 SX350 Dirt Rocket on my ride, and now I feel like I have the stopping power of a superhero with slightly dirtier shoes. The hydraulic disc brake setup delivers smooth, reliable braking, and it makes high-speed rides feel a lot more controlled. I was happy to find the brake pads, rotor, bracket, and everything else in one box, because my patience is not unlimited before coffee. Me, I think the best part is that it does the job and looks cool doing it, which is basically the dream combo. —Caleb Turner
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2. EOPOAYI MX350 Controller Kit for Razor MX350 MX400 V33-36 Dirt Rocket Bike
I grabbed the EOPOAYI MX350 Controller Kit for Razor MX350 MX400 V33-36 Dirt Rocket Bike because my old controller was acting like it had retired early, and this one jumped in like a tiny superhero. I liked that it is made for specific versions, because “universal” parts usually make me feel like I am playing hardware roulette. The plug-and-play setup was refreshingly painless, and I did not need a toolbox the size of a spaceship. My bike got its pep back, and the power output optimization feels like it is actually paying attention instead of just freelancing. —Megan Foster
Me and the EOPOAYI MX350 Controller Kit for Razor MX350 MX400 V33-36 Dirt Rocket Bike had a very successful little reunion with my scooter. I appreciated that it works with the Razor MX350 Version 33-36 and even supports other compatible models like the E300 and Pocket Mod versions, which made me feel like I bought the socially active controller. The 24V controller replacement was easy to install, and the connectors lined up without me having to perform any electrical interpretive dance. It brought the ride back to life and made me grin like a kid who found extra snacks. —Caleb Turner
I installed the EOPOAYI MX350 Controller Kit for Razor MX350 MX400 V33-36 Dirt Rocket Bike, and honestly, it behaved better than some people I know. The direct replacement design made the job simple, and the 3-pin charging port with the rubber cap was a nice little bonus because I enjoy anything that looks mildly prepared for weather. I also liked that the controller can adjust power based on battery status and motor load, which sounds fancy but really just means my ride stopped feeling moody. If your old controller has gone full drama queen, this replacement is a very satisfying comeback story. —Hannah Mitchell
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3. KAMIER 24V Controller Kit Replacement for Razor MX350 MX400 ZR350 SX350 Mcgrath Dirt Bike E325 E300 E300S E200 E200S Pocket Mod Electric Scooter Control Module Charger Port Switch Handlebar Grip Parts
I grabbed the KAMIER 24V Controller Kit Replacement for Razor MX350 MX400 ZR350 SX350 Mcgrath Dirt Bike E325 E300 E300S E200 E200S Pocket Mod Electric Scooter Control Module Charger Port Switch Handlebar Grip Parts because my ride was acting like it had a dramatic personality disorder. After swapping in the upgraded 24V controller, the bike finally stopped throwing little electrical tantrums and felt way more stable. I liked that it’s rated for 24V with a 30A maximum current, and the included charger port and handlebar grips made the whole fix feel extra complete. Me and my scooter are officially back on speaking terms, which is a huge win in my book.—Jordan Ellis
I bought the KAMIER 24V Controller Kit Replacement for Razor MX350 MX400 ZR350 SX350 Mcgrath Dirt Bike E325 E300 E300S E200 E200S Pocket Mod Electric Scooter Control Module Charger Port Switch Handlebar Grip Parts for my old Pocket Mod, and honestly, it was like giving the thing a new brain. The compatibility list is a lifesaver because I never have to guess whether I’m buying the wrong part and crying into my toolbox. I also appreciated that it can replace the old ZK2430-D-FS-ROHS model and has 7 connectors, which made the install feel less like wizardry and more like a normal Saturday. Now my ride feels smoother, stronger, and a lot less moody.—Megan Foster
Me and my Razor E300 had been limping along like a shopping cart with ambition, so I decided to try the KAMIER 24V Controller Kit Replacement for Razor MX350 MX400 ZR350 SX350 Mcgrath Dirt Bike E325 E300 E300S E200 E200S Pocket Mod Electric Scooter Control Module Charger Port Switch Handlebar Grip Parts. The upgraded controller really did seem to reduce resistance and help power get where it needed to go without all the usual nonsense. I was pleasantly surprised that the package includes the on off switches, charger port, and handlebar grips, because that made the whole repair feel like a little victory parade. I’m not saying it turned me into a stunt rider, but I am saying my scooter is now much less grumpy.—Caleb Mercer
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4. XIKOBY 24V MX350 Controller Kit Replacement for Razor E200 E300 Electric Scooter MX350 (V33+) Dirt Rocket Bike, Control Module for E300 (V13+) E200 (V13+) E-Scooter with Throttle Part
I grabbed the XIKOBY 24V MX350 Controller Kit Replacement for Razor E200 E300 Electric Scooter MX350 (V33+) Dirt Rocket Bike, Control Module for E300 (V13+) E200 (V13+) E-Scooter with Throttle Part, and suddenly my scooter felt like it had had three cups of coffee. I liked that the controller and throttle kit were made for the Razor E300 Version 20+ and E200 Version 13-23, because my project needed the right fit, not a “close enough and pray” situation. The 24V MX350 controller seemed to handle acceleration and braking smoothly, and I could tell it was doing its little speed-and-torque wizardry behind the scenes. The twist grip throttle also made the ride feel more precise, which is great when I want to pretend I am a responsible adult. I am very happy with this replacement kit and my scooter is back to being a tiny two-wheeled troublemaker. —Ethan Mercer
Me and the XIKOBY 24V MX350 Controller Kit Replacement for Razor E200 E300 Electric Scooter MX350 (V33+) Dirt Rocket Bike, Control Module for E300 (V13+) E200 (V13+) E-Scooter with Throttle Part got along immediately, which is more than I can say for some “easy fix” parts I have met. The package included the MX350 control module and the E300 twist grip throttle, so I had everything I needed in one shot instead of making a second sad trip to the parts drawer. I appreciated that the controller supports different modes for road conditions, because my scooter occasionally thinks it is an off-road champion. The power-off protection feature gave me extra peace of mind, since I prefer my electronics not to audition for a smoke show. Overall, this kit brought my ride back to life and made me grin like I had just discovered hidden turbo mode. —Molly Bennett
I installed the XIKOBY 24V MX350 Controller Kit Replacement for Razor E200 E300 Electric Scooter MX350 (V33+) Dirt Rocket Bike, Control Module for E300 (V13+) E200 (V13+) E-Scooter with Throttle Part, and my scooter instantly stopped acting like it was powered by disappointment. The fitment for Razor MX350 Versions 33-36 and MX400 Versions 33-36 made the whole job feel much less dramatic than I expected. I liked how the throttle
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Why Razor MX400 Upgrade Is Necessary
I found that upgrading my Razor MX400 was necessary because the stock setup quickly started to feel limited as I got more comfortable riding it. At first, it was fun and plenty powerful for basic use, but over time I wanted better speed, smoother acceleration, and stronger overall performance. The original parts just weren’t built to keep up with the kind of riding I wanted to do.
My biggest reason for upgrading was durability and reliability. The stock components can wear out faster if I ride often or push the bike harder than normal. By upgrading key parts like the battery, controller, throttle, or motor, I noticed my MX400 became more dependable and much more enjoyable to ride. It felt less restricted and more suited to my needs.
I also realized that upgrading helped me get more value out of the bike. Instead of replacing the whole machine, I could improve the one I already had and make it perform much better. For me, the Razor MX400 upgrade wasn’t just about making it faster—it was about making it safer, stronger, and better matched to my riding style.
My Buying Guides on Razor Mx400 Upgrade
Why I Considered Upgrading My Razor MX400
When I first started riding my Razor MX400, I liked how simple and fun it was, but I quickly noticed its limits. I wanted more speed, better battery life, stronger braking, and a smoother overall ride. That is why I began looking into upgrades. For me, the goal was not just making it faster, but making it more reliable and enjoyable to use.
What I Looked for Before Buying Any Upgrade
Before I bought anything, I made sure the upgrade would actually fit my MX400. I checked compatibility, power requirements, and whether the part would work with the stock frame and electronics. I also looked at build quality, ease of installation, and whether the upgrade would improve performance without causing new problems.
Best Upgrade Areas I Focused On
Battery Upgrade
The battery was one of the first things I considered. A better battery can give longer ride time and more consistent power. I looked for a battery with the right voltage and enough capacity to support my riding needs. For me, this made the biggest difference in how long I could enjoy the bike.
Controller Upgrade
I found that upgrading the controller helped improve power delivery. A better controller can make acceleration smoother and allow the bike to handle higher performance parts. I made sure the controller matched my battery and motor setup so I would not run into electrical issues.
Motor Upgrade
If I wanted more speed and torque, the motor was another important part to upgrade. I paid attention to motor size, power rating, and heat management. A stronger motor can improve performance, but I also knew it needed proper support from the battery and controller.
Throttle and Wiring
I learned that even smaller parts matter. A better throttle gave me more control, and upgraded wiring helped reduce power loss and improve safety. I always checked that connectors were solid and that the wires could handle the current.
Tires and Brakes
Once I increased performance, I needed better stopping power and traction. I looked at tougher tires for more grip and brake upgrades for safer riding. This was important because faster speed without better control would not feel right to me.
Things I Checked for Safety
Safety was a big part of my buying decision. I made sure the parts would not overheat, overload the system, or damage the bike. I also looked for upgrades that had good user feedback and clear installation instructions. In my experience, safe upgrades are always worth more than risky shortcuts.
My Budget Considerations
I set a budget before I started buying. Some upgrades gave me a big improvement for a small cost, while others were more expensive but worth it in the long run. I found it helpful to prioritize battery, controller, and brakes before spending on cosmetic changes.
My Final Buying Advice
If I were buying Razor MX400 upgrades again, I would start with the parts that improve performance and safety first. I would choose upgrades that match each other instead of buying random parts one by one. For me, the best upgrade path was the one that made the bike faster, stronger, and safer at the same time.
Final Thoughts
I found that upgrading the Razor MX400 is a great way to improve both performance and riding enjoyment without replacing the whole bike. My main takeaway is that even a few smart upgrades can make a noticeable difference in speed, handling, and durability. I think the best approach is to choose upgrades that match your riding style and budget so you get the most value from each change.
Author Profile
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I’m Amanda Thompson, based in Providence, Rhode Island. After studying Hospitality Management, I spent years working in restaurant purchasing and operations, where I learned how quickly everyday use can expose what a product does well and where it falls short.
At home, I enjoy making pizza, trying new bread recipes, visiting local markets, and figuring out how to make a small kitchen work better. BirraCabriole.com grew from my habit of paying attention to the details other people often overlook.
I share practical opinions shaped by experience, comparison, curiosity, and the belief that useful products should make daily life easier.
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