Someone guide me in Speeding up a Blue Electric Razor Dirt Bike

3685 Views 22 Replies 8 Participants Last post by Atvrunner2, 28 d ago

Squidtoe

Discussion Starter · May 1, 2021

My 9 year old cousin has a Electric blue razor. He’s a maniac and wants it to go faster, I told him it’s possible with the right guidance. Can someone suggest parts and leave step-by-step instructions on how to upgrade it? I’d greatly appreciate it.

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Atvrunner2

· #2 · May 1, 2021

How fast does he want to go??
There is a currie 500w motor that bolts in, the back half my need to be clocked to get the wire out of any interference. But that would be the only modification. You probably gain 1 - 2 mph.
Or....
Buy a 36v controller and throttle for an MX500/MX650. Then fit a third battery in there. Easiest way is to flatten the sides of the battery tray and fit the three in sideways.
Put a fusable link (30amp fuse) in between each battery.
Thats it, better takeoff, and weight dependent, anywhere between 21 and 23mph. For pavement.
If want offroad, grass etc. Put a smaller sprocket on the motor. I believe it's 10 or 11 tooth, so drop it one which would be 9 or 10 tooth. You will lose a little top speed but have way more low-end power take you through the grass.

www.ebay.com

Razor MX500 & MX650 6-Pin Throttle and Controller Kit 722460266689 | eBay

Find many great new & used options and get the best deals for Razor MX500 & MX650 6-Pin Throttle and Controller Kit at the best online prices at eBay! Free shipping for many products!

www.ebay.com

And the biggest batteries, if you replace all 3, is the 12v 9ah batteries.
Otherwise one battery at whatever ah the other 2 you have are.

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dhughes214

· #3 · May 13, 2021

Theres a really good kit on ebay for people new to modding razors. I'll find it and post the link here. Basically its a throttle and 36v controller, but the guy wires all the correct plugs on for you. So all you do is unplug the old controller and throttle, and plug in the new ones. Super simple. Then all you gitta do is wire in an extra battery. But depending on how old the existing batteries are, you may just want to get 3 new ones.

dhughes214

· #4 · May 13, 2021

www.ebay.com

Razor 36v Mx350 Mx 400 SX RSF 36volt Overvolt Kit 24v to 36v Controller Kit E300 | eBay

Find many great new & used options and get the best deals for Razor 36v Mx350 Mx 400 SX RSF 36volt Overvolt Kit 24v to 36v Controller Kit E300 at the best online prices at eBay! Free shipping for many products!

www.ebay.com

dhughes214

· #5 · May 13, 2021

If you dont feel comfortable adding a battery, you can get these that are pre wired with the correct plug.

www.amazon.com

Amazon.com: AlveyTech 36 Volt Battery Pack for The Razor EcoSmart Metro (9 Ah, with Harness) : Sports & Outdoors

Amazon.com: AlveyTech 36 Volt Battery Pack for The Razor EcoSmart Metro (9 Ah, with Harness) : Sports & Outdoors

www.amazon.com

Atvrunner2

· #6 · May 14, 2021

4

Yeah for sure the fast scooters controllers are great. Plug and Play. A friend of mine wanted me to 36 volt his mini chopper. He went with the cheaper mx500/MX650 controller/throttle. I even used all the old wiring. Just moved one of the outside wires over and added a link in between the third battery and the second battery. Here's a few pics, it's almost done, the only problem is the battery covers are about an inch and a half further apart with the extra battery in there. Need to flatten the tray to get all three batteries in.

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Francis40

· #7 · May 18, 2021

Did the pocket bike upgrade pan out?

TheRadDad

· #8 · May 25, 2021

You can actually modify the stock speed controller for free in less than an hour and gain more torque and top speed. It's called a speed limiter bridge mod if I'm not mistaken and only requires basic hand tools.

Atvrunner2

· #9 · May 25, 2021

I believe I read that on here somewhere or a youtube video. Using a paperclip. But I believe the heat sinks are still small. I know Fast Scooters controllers have one extra heatsink and they're bigger. That was a video I watched of a guy who tore one apart and a stock one apart.

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Atvrunner2

· #10 · May 25, 2021

By the way, That chopper project ended up with a top speed of 21mph. That was with the mx500 controller/throttle and one extra battery.
Pretty scary on that little thing. I rode it before I give it back to my buddy. And two days later he blew the rear tire. Ran over stick. So then I had to replace the rear tube. I'll good now

Reactions: 1

TheRadDad

· #11 · May 25, 2021

Atvrunner2 said:
I believe I read that on here somewhere or a youtube video. Using a paperclip. But I believe the heat sinks are still small. I know Fast Scooters controllers have one extra heatsink and they're bigger. That was a video I watched of a guy who tore one apart and a stock one apart.

Exactly! You basically create an additional pathway for the electricity and free up resistance from the limiter allowing more juice to the motor. And while the stock speed controller does have a rather small heat sink I've done this mod on 3 different speed controllers now (2 razor e300s and my mx500) and I've yet to cook any of them... one is over 6 years old lol!

Reactions: 1

MrKitty

· #12 · May 25, 2021

TheRadDad said:
Exactly! You basically create an additional pathway for the electricity and free up resistance from the limiter allowing more juice to the motor. And while the stock speed controller does have a rather small heat sink I've done this mod on 3 different speed controllers now (2 razor e300s and my mx500) and I've yet to cook any of them... one is over 6 years old lol!

Can you take a picture of the board with the bypassed mosfet ???

Reactions: 1

TheRadDad

· #13 · May 25, 2021

MrKitty said:
Can you take a picture of the board with the bypassed mosfet ???

Absolutely! Give me a bit, just got the kids from school and gotta do dinner but I'll post some pics here probably in a couple hours

TheRadDad

· #14 · May 25, 2021

Here's one of my e300 speed controllers I modded. My finger is pointing to the bypass I installed. I gotta try and break the seal I made on the mx500 speed controller to show that one off lol

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Atvrunner2

· #15 · May 26, 2021

Yes exactly, I believe I did that on an e200 computer years ago because it wasn't working and after the mod it started to work.
Crazy stuff. I didn't do any testing afterwards other than it worked. You said you gain more torque which I know you'll feel, did you gain any mile per hour and how much? That mod and a lithium pack would probably be great for a budget build. Although that Chopper I did was only $85 to upgrade.

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TheRadDad

· #16 · May 26, 2021

Atvrunner2 said:
Yes exactly, I believe I did that on an e200 computer years ago because it wasn't working and after the mod it started to work.
Crazy stuff. I didn't do any testing afterwards other than it worked. You said you gain more torque which I know you'll feel, did you gain any mile per hour and how much? That mod and a lithium pack would probably be great for a budget build. Although that Chopper I did was only $85 to upgrade.

Yeah i gained a little more top end along with it, i wouldnt say it qualifies for a salt flat racer or anything but it was good for a couple miles per hour at least.

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TheRadDad

· #17 · May 28, 2021

My mx500 speed controller with speed limiter bypass mod

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lanzojoe184

· #18 · 1 mo ago

TheRadDad said:
Here's one of my e300 speed controllers I modded. My finger is pointing to the bypass I installed. I gotta try and break the seal I made on the mx500 speed controller to show that one off lol View attachment 160219

Can I use crazy. Glue since I don’t have access to a Sauter

Atvrunner2

· #19 · 1 mo ago

I would not use crazy glue.

MrKitty

· #20 · 1 mo ago

Glue is generally non-conductive.
You can get a soldering kit from the hardware store they are very inexpensive...

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