Most buyers wrongly assume any part labeled for the MX650 will work without further modification. I have compared these kits by analyzing common user feedback and hardware compatibility to help you avoid a costly mismatch. My goal is to guide you toward the right mechanical upgrade for your specific needs. Read on for my ranked list of the best dirt bike enhancements available today.
| Best For | Product | Name | Score | |
|---|---|---|---|---|
| Standard Factory Replacement |  |
XIKOBY MX500 Controller and Throttle Kit for Razor MX650 SX500 Dirt Bike | 9.8/10 | View on Amazon |
| Rough Terrain Handling |  |
Front Suspension Upgrade 2.0 Fits Razor MX650 MX500 SX500 | 9.3/10 | View on Amazon |
| Custom Frame Geometry |  |
AUTOVIC Swing Arm Extension Kit 4''-5'' Widen for Razor MX650 SX500 | 8.8/10 | View on Amazon |
| Maximum Power Output |  |
Electric Brushless DC Motor Kit,48V 2000W Motor,33A Controller,LCD Throttle | 8.2/10 | View on Amazon |
1. XIKOBY MX500 Controller and Throttle Kit for Razor MX650 SX500 Dirt Bike
This kit earns its place because it offers the most reliable factory-standard performance for those needing a simple repair. It provides a straightforward path to getting your bike back on the trail without complicated wiring or custom fabrication.
In my view, this is the safest choice for a daily rider who just needs their bike to function as intended. It lacks the flash of high-wattage systems, but it delivers consistent throttle response and dependable operation.
Users frequently report that this kit resolves common intermittent power issues.
The installation process is widely considered beginner-friendly by most owners.
Buyers appreciate the lack of complex setup requirements for this specific unit.
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2. Front Suspension Upgrade 2.0 Fits Razor MX650 MX500 SX500
This kit is built for the aggressive rider who spends more time on rough terrain than on flat pavement. It stiffens the front end significantly to handle jumps and uneven ground that would bottom out the stock setup.
I find that adding this suspension is the most effective way to improve handling, as it keeps the front wheel planted through corners. Just be aware that the added rigidity might feel harsh if you only ride on smooth driveways.
Feedback indicates this upgrade noticeably improves control during technical riding.
Owners often suggest using a heavier fork oil to get the most out of these components.
The build quality is generally seen as a solid step up from factory hardware.
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3. AUTOVIC Swing Arm Extension Kit 4''-5'' Widen for Razor MX650 SX500
The most striking feature of this kit is its ability to physically lengthen the bike, which shifts the center of gravity for better high-speed stability. By adding four to five inches of length, it creates a much more planted feel that resembles a larger, full-sized motorcycle.
I believe this is a smart choice if you are building a custom project or need more space for a larger battery tray. Keep in mind that longer frames require more careful chain tensioning to prevent frequent slips.
Buyers frequently mention that this extension allows for larger rear tire clearance.
The extended wheelbase is commonly praised for adding stability at higher speeds.
Some users recommend additional bracing for those who push the bike to its limits.
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4. Electric Brushless DC Motor Kit,48V 2000W Motor,33A Controller,LCD Throttle
Buyers often complain that this motor is difficult to fit without modifying the original mounting bracket, but the payoff is an undeniable surge in speed. This kit is the only real option for those chasing maximum power output and aggressive acceleration.
I rank this as my top choice because it fundamentally changes how the machine performs. You must be prepared to replace your stock wiring and possibly your battery to prevent the system from drawing too much current and causing a shutdown.
Users consistently praise the massive torque gains compared to the stock motor.
The inclusion of an LCD display is a popular feature for monitoring real-time voltage.
Many owners highlight that this kit requires a serious upgrade to the electrical system.
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Choosing Between Them
If you want to transform your bike, my top recommendation is the 2000W Brushless Motor Kit, which provides the most significant performance increase for those who prioritize speed. For riders focused on trail control, the Front Suspension Upgrade is the smartest path, while those building custom frames will prefer the Swing Arm Extension. If you simply need to restore your bike to factory health, the XIKOBY Controller Kit remains the most reliable utility choice.
Keep in mind that high-wattage components are demanding. You should plan on installing upgraded batteries and heavy-duty wiring to support such power, as standard parts often suffer from premature power sag under the load of a 2000W system. Always double-check your mounting space before committing to major drivetrain changes.
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