This is awesome thanks mate. I think I’ll 3D print a Makita mount for it. Hopefully that works. Really appreciate the tip! The original is just too slow and runs out too fast!
After watching this video, I did experiment with a variable power supply on my sons mx125. Basically 18V like this video is good, with no load did not pull much current(A), but I am sure with a 35-50lb kid will pull enough to possibly warm up the motor. 18V was the sweet spot for higher rpm anything below did not do much from stock speed. Yes I had stock control module and motor when doing this. I have not updated my sons bike yet, issue I see is no suspension can cause a kids back to get hurt if they go over bumps, so keeping it stock for now till I figure out how to build a suspension for rear.
Update: upgraded with a 18V battery. Night and day difference. All items are stock except for battery. I left the old one in place and put switches to switch between 12v and 18v as 18v Ah is much lower, dies faster, but it does go faster, more power to go up hills. Top speed was 14.6mph
Yea i found that the 18v 5ah lithium lasts mush longer than the stock gel battery. Motor can get warm to touch but have had no issues, ours is still going strong. As for suspension, I really don't think it's an issue, same as a bmx bike. But 18v definitely makes the bike a lot more fun for the kids.
Mate, 3D printed a Makita mount. And it hauls ass! Prob twice as fast as the 12v. Motor heated up after a good hours riding. But my 4 year old and his cousin loved it. Thanks 👍
That's awesome! Yea I think with the stock 12v battery the bike goes 12kmh, but 22kmh on 18v. Best thing is being able to change out the battery when it goes flat. Ours is still going strong on original motor
I've got a mx 500 36v ... i put 2, 20v to run 40v .... myself and my son weigh about 260 combined and just rode about 4 miles tonight together around town .....
I wired in my makita 18v after watching this but only got acouple of runs and it stopped working so now need to figure out what's gone wrong. Did go very well for the 2 runs we did get
Ours is still going strong, maybe check the connection between battery and charger? Did you check how much voltage the battery is putting out ? Maybe more than 18v
Just ordered the 20v dewalt adapter to do this. Does the bike do any better in grass? Ours cant make it through grass if their is any kind of incline. I figured this is worth a shot before trying a motor/controller upgrade.
Yea it has a bit more torque now and better on grass but still better on a hard surface though. Just a note, my 18v batteries are putting out 20v on a multimeter, might pay to check what the 20v batteries are actually putting out.
Hey, I put in a Milwaukee adapter for my 18v. Rides much faster on concrete! But when on grass under a tougher load (with my son) the built in circuit breaker keeps popping and turning the red switch off. Have you had this problem? If so, how do I change to a higher breaker switch without changing the voltage?
I tried this with my daughters mx125 but when you hit the throttle and let go of the throttle it doesn’t stop it just keeps going anyway to fix it I did it just like you did but the throttle stays full even when you let go
Hey mate I just did this upgrade the same way you did, but I used a adapter from Amazon. Is the bike still running without issues? Do the ryobi battery's have low voltage protection? Does the mx125 run the batteries so flat that it damages the battery? Thanks in advance, my young fulla is over the moon with his new bike set up.
Hello bro , I wanted to ask that is it the stock speed of the bike in the beginning of the video or after you have upgraded it , also is it safe to upgrade and pls tell me which battery should be bought to upgrade it's speed
Hi, that's the speed after conversion. They only go about 12kmh usually. I just used my 18v drill batteries. Wouldn't matter what brand but I wouldn't go over 18v.
Reused the harness, basically just detached the old battery at the terminals, then attached the ends of the wires that were on the battery to the contacts in the USB charger for the new battery.
Hi, if you look on the ryobi battery, on the terminals there is a + and - Take note of which side contacts in the USB charger. Take the USB apart and solder you battery leads directly to the contacts.
@@bill_chris first, take the old 12v battery out of the bike. CUT off the wires, or melt the solder off the battery terminals so you now have just the plug with the 2 wires coming out. This is what you will solder onto the USB charger. Now, Look into the hole where the ryobi battery fits into the usb charger, you will see silver metal contact points that match up to the silver contacts on the battery. We want to solder our wires that you got off the old battery onto the back of these contacts. Now take the screws out of the USB charger and open it in half. Now you can access the contacts. Solder one wire onto each contact. Make sure you get them around the right way, look on the battery to see which is + and -. Don't worry about all the other little wires and circuits, they don't matter, all we want is the plug off the old battery to be wired onto the main contacts in the USB charger. File or drill a little hole in the join of the 2 halves so when you put it back together, your wires can come out without getting pinched. You should end up with the USB charger with the 2 wires sticking out of it and the plug still on the end. Plug the wires back into the bike. Put ryobi battery into the charger. Test if it works, then secure the charger in place.
