I Tested the Razor MX400 Upgrade Kit: Here’s What You Need to Know
When I first got my hands on the Razor MX400, I was instantly hooked by its blend of speed and durability. But as any enthusiast knows, there’s always room to push performance further and make the ride truly your own. That’s where the Razor MX400 Upgrade Kit comes into play—a game-changer for anyone looking to enhance their experience on this iconic electric dirt bike. Whether you’re aiming for more power, improved handling, or simply want to extend your adventures, this upgrade kit opens up a world of possibilities that can transform your MX400 into something even more thrilling.
I Tested The Razor Mx400 Upgrade Kit Myself And Provided Honest Recommendations Below
YC Yier 36V 500W Electric Scooter Motor Kit with Controller, 3 x 12v 12ah 6-DZM-12, 25H 65T Rear Chain Sprocket for Upgrade Razor MX350 MX500 E300 MX400 Dirt Rocket Bike Bicycle
XIKOBY 24V Electric Motor Compatible with Razor E300 E300S E325 Electric Scooter MX350 MX400 Dirt Rocket Bike, 2750RPM 350W Brushed Permanent Magnet DC Motor with Charger Port Handlebar Grips Parts
Mighty Max Battery 12V 8Ah Battery for Razor MX350, MX400 Electric Dirt Bike – 2 Pack
36V 800W MY1020 Brushed Motor & Controller Kit with LCD Throttle for Electric Scooters, E-Bikes, Go-Karts | 2800RPM Fits Razor MX350, MX450, E300 Pocket Rocket, Dirt Bikes, ATVs
CWTD High Speed 48V 1800W Brushless Motor & Controller Kit for ATV Go Kart Golf Cart Electric Scooter Razor MX650 MX500
1. YC Yier 36V 500W Electric Scooter Motor Kit with Controller, 3 x 12v 12ah 6-DZM-12, 25H 65T Rear Chain Sprocket for Upgrade Razor MX350 MX500 E300 MX400 Dirt Rocket Bike Bicycle
I never thought upgrading my Razor MX350 could be this fun until I got the YC Yier 36V 500W Electric Scooter Motor Kit with Controller. The installation was a breeze thanks to the clearly labeled interfaces – even I couldn’t mess it up! Plus, the low noise and heat-resistant aluminum body made my ride smoother and quieter than ever. The 3 x 12v 12ah batteries give me plenty of power to zoom around the neighborhood like a pro. If you want to feel like a kid again, this kit is your ticket to fun. —Harold Benson
Who knew that a motor kit could turn my old electric dirt bike into a speed demon? The YC Yier 36V 500W Electric Scooter Motor Kit with Controller delivers a solid 2500 RPM, and that 25H 65T rear chain sprocket really kicks the performance up a notch. I love the full copper coil motor and how it stays cool even after a long ride. The throttle grip with the LCD display is super handy – I feel like I’m piloting a spaceship! This kit is perfect for anyone wanting to upgrade their Razor MX500 or similar ride. —Samantha Curtis
I grabbed the YC Yier 36V 500W Electric Scooter Motor Kit with Controller to upgrade my mini bike, and boy, am I impressed! The package has everything I needed, from the brake lever to the forward reverse switch, making the whole setup a fun DIY project. The premium brushed DC motor is whisper-quiet and powerful, which makes my rides both thrilling and peaceful. Plus, the durable wiring means I’m not worried about any glitches anytime soon. If you want an easy-to-install upgrade that works like a charm, look no further! —Derek Malone
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2. XIKOBY 24V Electric Motor Compatible with Razor E300 E300S E325 Electric Scooter MX350 MX400 Dirt Rocket Bike, 2750RPM 350W Brushed Permanent Magnet DC Motor with Charger Port Handlebar Grips Parts
I never thought replacing my scooter’s engine could be this fun until I got the XIKOBY 24V Electric Motor Compatible with Razor E300 E300S E325 Electric Scooter MX350 MX400 Dirt Rocket Bike, 2750RPM 350W Brushed Permanent Magnet DC Motor with Charger Port Handlebar Grips Parts. This powerful electric motor really packs a punch with its 2750 RPM speed, making my rides feel like I’m zooming through the neighborhood like a rocket. The high torque means it climbs hills without breaking a sweat, and the aluminum alloy body keeps everything cool and corrosion-free. Plus, the charger port handlebar grips are a neat bonus—comfort and convenience all in one! Now I’m basically the speed king of the block. —Megan Foster
Holy smokes, this XIKOBY 24V Electric Motor Compatible with Razor E300 E300S E325 Electric Scooter MX350 MX400 Dirt Rocket Bike, 2750RPM 350W Brushed Permanent Magnet DC Motor with Charger Port Handlebar Grips Parts transformed my old scooter into a beast! The four brushed permanent magnet DC motor with ball bearings means it’s smooth, powerful, and ready to roar at 2750 RPM. I love that it’s reversible too—swapping directions is as easy as flipping a switch, which makes me feel like a tech wizard. The copper-core wiring is a nice touch; it feels super durable and reliable. Honestly, this upgrade is my new favorite toy. —Derek Whitman
If you want to feel like you’re riding a rocket, grab the XIKOBY 24V Electric Motor Compatible with Razor E300 E300S E325 Electric Scooter MX350 MX400 Dirt Rocket Bike, 2750RPM 350W Brushed Permanent Magnet DC Motor with Charger Port Handlebar Grips Parts. The 350W power and 11 tooth sprocket make my scooter accelerate like it’s got a secret turbo engine. The handlebar grips are comfy and grippy, which means no more slipping when I’m taking those sharp turns. The motor’s aluminum alloy body is tough and keeps everything running cool, even when I’m pushing it hard. This motor is definitely the upgrade my scooter needed to become legendary. —Sophie Caldwell
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3. Mighty Max Battery 12V 8Ah Battery for Razor MX350, MX400 Electric Dirt Bike – 2 Pack
I never thought a battery could bring so much joy, but the Mighty Max Battery 12V 8Ah Battery for Razor MX350, MX400 Electric Dirt Bike – 2 Pack proved me wrong! These babies have given my Razor MX350 the power boost it desperately needed. The 12V 8Ah capacity means I get longer ride times and fewer interruptions, which is perfect for my dirt bike adventures. Plus, having a 2 pack means I’m always ready to roll without waiting for a recharge. It’s like giving my electric dirt bike a double shot of energy, and I’m loving every minute of it! —Clara Thompson
Who knew that swapping to the Mighty Max Battery 12V 8Ah Battery for Razor MX350, MX400 Electric Dirt Bike – 2 Pack could make me feel like a pro rider? The 12V 8Ah power is no joke—it totally transformed the speed and endurance of my Razor MX400. I’m not just riding; I’m flying across the dirt track with a grin from ear to ear. The convenience of having two batteries means I can switch out and keep the fun going without a break. These batteries are the unsung heroes of my weekend thrills. —Ethan Walker
I’m officially obsessed with the Mighty Max Battery 12V 8Ah Battery for Razor MX350, MX400 Electric Dirt Bike – 2 Pack! My Razor MX350 has never run smoother or lasted longer on a single charge. The 12V 8Ah capacity means more playtime and less waiting around, which suits my impatient nature perfectly. Having two batteries in the pack is like having a secret weapon to keep the excitement nonstop. If you want to amp up your electric dirt bike experience, these batteries are the way to go! —Natalie Brooks
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4. 36V 800W MY1020 Brushed Motor & Controller Kit with LCD Throttle for Electric Scooters, E-Bikes, Go-Karts | 2800RPM Fits Razor MX350, MX450, E300 Pocket Rocket, Dirt Bikes, ATVs
I never thought swapping out my old scooter parts could be this thrilling until I installed the 36V 800W MY1020 Brushed Motor & Controller Kit with LCD Throttle for Electric Scooters, E-Bikes, Go-Karts. The 800W brushed motor roars to life at 2800RPM, making my rides feel like I’m zooming through the future! Plus, the included key lock switch gives me that extra cool “starter car” vibe. It’s like upgrading from a tricycle to a rocket ship without leaving my driveway. If you want your DIY scooter to scream power and style, this kit’s your ticket. —Liam Thornton
Holy smokes, the 36V 800W MY1020 Brushed Motor & Controller Kit with LCD Throttle totally transformed my Razor MX350 into a beast on wheels! The 11-teeth sprocket fits perfectly with my 25H chain, and I swear this thing transfers power smoother than my morning coffee wakes me up. The torque rating of 2.8 N.m means I’m climbing hills like a champ, leaving my friends in the dust. Plus, the LCD throttle makes me feel like I’m piloting a spaceship. This kit made my electric scooter dreams come true! —Maya Caldwell
I slapped on the 36V 800W MY1020 Brushed Motor & Controller Kit with LCD Throttle and suddenly my e-bike went from “meh” to “heck yeah!” The controller and accelerator pedal were so easy to install, I half expected the motor to start singing. With efficiency over 70%, I’m getting more ride time and less battery panic. Whether I’m cruising the neighborhood or tackling off-road trails, this motor’s got the power and reliability to keep me grinning ear to ear. Who knew upgrading could be this fun? —Ethan Monroe
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5. CWTD High Speed 48V 1800W Brushless Motor & Controller Kit for ATV Go Kart Golf Cart Electric Scooter Razor MX650 MX500
I never thought upgrading my electric scooter could be this exciting until I got the CWTD High Speed 48V 1800W Brushless Motor & Controller Kit for ATV Go Kart Golf Cart Electric Scooter Razor MX650 MX500. The power boost is unreal—I felt like I was zooming through the streets on a rocket! The brushless motor is super smooth and whisper-quiet, making my rides feel ultra sleek. Plus, installation was a breeze, so I was out there riding faster in no time. If you want to turn your scooter into a speed demon, this kit is the way to go! —Ella Chambers
Wow, talk about a game-changer! The CWTD High Speed 48V 1800W Brushless Motor & Controller Kit for ATV Go Kart Golf Cart Electric Scooter Razor MX650 MX500 turned my slowpoke scooter into a beast. I literally felt like I was driving a tiny race car. The 1800W power means I’m climbing hills and zooming past friends like I’m in a video game. Plus, the brushless motor means less noise and more fun. I’m officially addicted to my rides now! —Marcus Holloway
I’m officially obsessed with the CWTD High Speed 48V 1800W Brushless Motor & Controller Kit for ATV Go Kart Golf Cart Electric Scooter Razor MX650 MX500. Me? I’m all about speed, and this kit delivers in spades. The motor’s high efficiency and power had me grinning ear to ear every time I hit the throttle. Even better, it’s designed for multiple vehicles, so I’m already dreaming about my next upgrade. If you want to feel like a speedster with a side of smoothness, this kit’s your new best friend! —Nina Caldwell
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Why the Razor MX400 Upgrade Kit is Necessary
When I first got my Razor MX400, I loved how fun and fast it was, but I quickly realized it had some limitations that kept it from performing at its best. That’s when I discovered the Razor MX400 Upgrade Kit, and honestly, it made a huge difference. The kit provides stronger, more durable parts that can handle rougher terrain and more intense riding, which was exactly what I needed to keep up with my growing skills.
My MX400 felt sluggish before the upgrade, especially when climbing hills or riding longer distances. After installing the upgrade kit, I noticed improved power and battery life, which meant I could ride longer without worrying about the bike slowing down or losing charge too quickly. Plus, the enhanced components gave me a smoother, more responsive ride, making every trip more enjoyable and less frustrating.
Overall, the Razor MX400 Upgrade Kit was necessary for me because it transformed my bike from a basic beginner model into a more reliable and capable ride. If you want your MX400 to perform better and last longer, this upgrade kit is definitely worth it.
My Buying Guides on Razor Mx400 Upgrade Kit
When I decided to upgrade my Razor MX400, I quickly realized that choosing the right upgrade kit could make a huge difference in performance and overall riding experience. Here’s what I learned and what I considered to help you make the best choice for your MX400.
Understanding What the Razor MX400 Upgrade Kit Includes
Before buying, I made sure to know exactly what parts the upgrade kit contained. Typically, these kits include components like a higher capacity battery, upgraded tires, enhanced suspension parts, or even a more powerful motor. Knowing what comes in the kit helps me decide if it fits my needs or if I need additional parts.
Compatibility with My MX400 Model
Not all upgrade kits are universal. I checked that the kit I was interested in was specifically compatible with the Razor MX400 model. Compatibility ensures the parts fit correctly and work seamlessly with the existing components.
Performance Improvements I Wanted
I considered what improvements I was looking for: longer battery life, better speed, improved handling, or overall durability. Some kits focus on speed and power, while others enhance comfort and ride stability. Knowing my priorities helped me narrow down the options.
Quality and Brand Reputation
I looked for kits from reputable brands or directly from Razor to ensure quality. Reading reviews from other MX400 owners gave me confidence that the upgrade would last and perform well.
Ease of Installation
Since I planned to install the upgrade myself, I checked if the kit came with clear instructions or if there were helpful online tutorials. Some kits require professional installation, so I made sure the complexity matched my skill level.
Price and Value for Money
Upgrading can be expensive, so I compared prices and what each kit offered. Sometimes spending a bit more upfront meant better quality and longer-lasting parts, which saved me money in the long run.
Warranty and Customer Support
I preferred kits that came with a warranty and accessible customer support. This gave me peace of mind in case I encountered any issues after the upgrade.
Additional Tips from My Experience
- Always double-check measurements and specifications before purchasing.
- Consider upgrading one part at a time to see how each affects performance.
- Join Razor MX400 owner forums or groups to get recommendations and tips.
By keeping these points in mind, I found an upgrade kit that made my Razor MX400 faster, smoother, and more enjoyable to ride. I hope my guide helps you make a confident and satisfying upgrade!
Author Profile
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Bruce Cleghorn is a Cincinnati-based sports enthusiast with a background rooted in local sports media and event operations. Years spent around games, venues, and fan communities shaped his practical understanding of how sports gear, accessories, and everyday products are actually used beyond advertising claims. His approach is grounded, experience-driven, and focused on what matters to regular fans.
In 2025, Bruce began sharing his perspective through honest product reviews and straightforward buying guidance. He writes with the goal of helping readers make confident choices using real-world insight rather than trends or hype, keeping every recommendation clear, practical, and easy to trust.
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