Most people assume that upgrading a Razor dirt bike requires expensive motor swaps, but a few affordable mechanical tweaks often yield better results. After digging into the buyer data for these two kits, I have formed a clear view on which modifications actually move the needle. You might be surprised by how much raw performance can be extracted from simple components. Let’s see which setup takes the crown in this honest comparison.
1. XIKOBY MX500 Controller and Throttle Kit for Razor MX650 SX500 Dirt Bike | MX650 Controller for RSF650 Dirt Rocket Electric, 36V Control Module & Twist Throttle Handlebar Grips for Dirt Quad 500 ATV
This kit earns its spot because it provides a complete electrical refresh for bikes suffering from sluggish acceleration or dead throttles. It acts as the brain of your machine, ensuring that the 36V power delivery is consistent and responsive when you twist the grip.
I find this to be a logical choice if your original electronics have failed or if you want a reliable baseline for a standard build. However, note that this is a direct replacement rather than a performance tuner, so it will not magically turn your bike into a professional racer.
Buyers frequently mention that this kit is a straightforward fix for unresponsive throttles.
The inclusion of the grip set is a common point of praise for those performing general maintenance.
Some users highlight that clear wiring knowledge is essential to avoid installation errors.
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2. MX650 Dirtbike Chain and Sprocket Upgrade Kit for Razor MX500 SX500 RSF650 | #35 Chain Sprocket 65 Teeth with Chain 108 Links Kit Fits Razor MX650 MX500 SX500 RSF650 Electric Dirt Bike and MY1020 motor
This kit is tailored for the rider who prioritizes immediate torque and aggressive off-road climbing over high top-end speeds. By moving to a 65-tooth sprocket, you effectively shorten the gear ratio, which gives the motor a significant mechanical advantage when starting from a standstill or tackling steep inclines.
In my view, this is the most effective way to change how the bike feels under your seat without touching the motor itself. The trade-off is a lower top speed, which is a fair price to pay if you prefer snappy acceleration on tight trails.
Enthusiasts frequently note that the 65-tooth configuration provides a noticeable boost in hill-climbing power.
The inclusion of a 108-link chain is consistently cited as a convenient, all-in-one solution for drivetrain swaps.
Many users point out that the build quality of the sprocket teeth holds up well under heavy load.
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Choosing Between Them
If you want to revitalize your ride, I recommend the MX650 Chain and Sprocket Upgrade Kit as the superior choice for most owners. This setup is perfect for the rider who wants punchy acceleration and better trail performance, whereas the XIKOBY Controller Kit serves primarily as a reliable fix for those needing to replace damaged electrical components.
I believe the mechanical advantage provided by the gearing change makes it the better investment for most casual riders. Please remember that upgrading your drivetrain for more power at the low end will often cost you a bit of top-end speed on flat ground.
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