48 Volt Razor MX350

I recently updated my son's Razor MX350 electric motorcycle. The bike was stolen last summer from my garage. Two months later we found the bike submerged in the creek behind our house. When we pulled it from the creek the bike was in very bad shape. All of the plastic had been ripped off and the electrical components were completely fried. I kept the remains in my garage until early spring and decided that it was time to bring this little bike back to life with some killer upgrades.
This is the bike stripped down to the factory frame. All the electric components were fried so destined for the trash.
I found some solid aluminum rod in my stock pile that the perfect diameter for some new cafe style handlebars.
I measured the width and chopped them down to size. Here is the bike with the new bars and a replacement motor that I salvaged from another junked Razor crotch rocket bike.
I installed a new 48v motor controller and 4 new 12v gel batteries. I connected the batteries in series to get the voltage up to 48 volts. Wow, what a difference in speed. The bench test proved to be about 3 times as fast as the original bike.
I found some scrap aluminum at the local recycling yard and purchased it for $5. What a deal! I drew out the shape for some fairings on paper first then transferred the shape to the aluminum sheets. Cut the aluminum with a handheld jigsaw and used a rubber mallet to shape them.
I added a new 48v electric motor. I had to make an adapter plate to mount the motor in the original motor mount holes. The new motor proved to have much greater torque compared to the original motor so I replaced the back sprocket with the smaller one that was on the old junk Razor crotch rocket. Next plan is to make a rear fender out of similar aluminum. Stay tuned, more images and video to come.
Razor MX350 48v MOD - Bench Test
Razor MX350 48v MOD - Speed Test

Discuss This Project: (4 Comments)

Comments

Hi I'm currently trying to do this same thing but I have questions. I already have my mx350 running 36volts with stock motor. Questions are can I run 48volts to the stock 350w motor? Also what 48v controller did u purchase and did you have to buy one that included a new throttle? I know that u can't use a 24v throttle in a 36v controller so thought I might need a new twist throttle with the new 48v controllers. If u could show me what parts you bought that be great. Also would u recommend getting a 48v 750 or 500watt instead of a 1000w motor so I don't have to change rear sprocket from to much torque from the 1000w like you did? Please email me cnyberg04@yahoo.com

Tinkering23, You can try to run 48v through the factory motor and controller but it will most likely burn it up. I'm currently running a 36v kit that I purchased through ebay. You can find it by searching "Scooter 36 volt 800 watt motor, controller and throttle kit-Complete" in ebay. This setup comes with motor, throttle and controller and will definitely run 48v. If your looking for a more powerful setup I would suggest purchasing this kit from Golden Motor. It will get you up to 30mph + running 48v. Very spunky little motor and controller. I would strongly suggest purchasing the Golden Motor 48v throttle that is compatible with this kit. They work great!

http://goldenmotor.com - Click on BLDC Motor and scroll down till you see the 1500W BLDC Motor and 2000W BLDC Controller. They also have throttles that will work with this setup. Either way you go, you will most likely have to change the sprockets to reach desired torque. It's worth a try with your current sprocket on the rear but the standard Razor front sprocket will not fit either of the two motors that I've suggested. I would suggest going with the smallest front sprocket that you can get for either of these since the RPM is so high. I'm currently running a 7 tooth sprocket on the front. If you want to see more pics and bikes like this you can checkout my Facebook group "Electric Motorcycle Builds". All of my small bikes are posted in that group and you can comment and ask more questions there. https://www.facebook.com/groups/684227311714643/

cool bike!
  • Tinkering23
    Hi I'm currently trying to do this same thing but I have questions. I already have my mx350 running 36volts with stock motor. Questions are can I run 48volts to the stock 350w motor? Also what 48v controller did u purchase and did you have to buy one that included a new throttle? I know that u can't use a 24v throttle in a 36v controller so thought I might need a new twist throttle with the new 48v controllers. If u could show me what parts you bought that be great. Also would u recommend getting a 48v 750 or 500watt instead of a 1000w motor so I don't have to change rear sprocket from to much torque from the 1000w like you did? Please email me cnyberg04@yahoo.com
  • admin
    Tinkering23, You can try to run 48v through the factory motor and controller but it will most likely burn it up. I'm currently running a 36v kit that I purchased through ebay. You can find it by searching "Scooter 36 volt 800 watt motor, controller and throttle kit-Complete" in ebay. This setup comes with motor, throttle and controller and will definitely run 48v. If your looking for a more powerful setup I would suggest purchasing this kit from Golden Motor. It will get you up to 30mph + running 48v. Very spunky little motor and controller. I would strongly suggest purchasing the Golden Motor 48v throttle that is compatible with this kit. They work great!
  • admin
    http://goldenmotor.com - Click on BLDC Motor and scroll down till you see the 1500W BLDC Motor and 2000W BLDC Controller. They also have throttles that will work with this setup. Either way you go, you will most likely have to change the sprockets to reach desired torque. It's worth a try with your current sprocket on the rear but the standard Razor front sprocket will not fit either of the two motors that I've suggested. I would suggest going with the smallest front sprocket that you can get for either of these since the RPM is so high. I'm currently running a 7 tooth sprocket on the front. If you want to see more pics and bikes like this you can checkout my Facebook group "Electric Motorcycle Builds". All of my small bikes are posted in that group and you can comment and ask more questions there. https://www.facebook.com/groups/684227311714643/
  • maddox
    cool bike!