MX650 mods? - Page 101 - Pocket Bike Forum - Mini Bikes
 5Likes
Reply
 
LinkBack Thread Tools
Junior Member
 
Join Date: May 2020
Posts: 1
Re: MX650 mods?

Quote:
Originally Posted by miker71 View Post
Filitup,

Ok, based on your private messages to me, you would rather not cut and weld, so the 1200w motor is out.. *I don't blame you - it was quite a job, and if it were not for a good friend of mine to do the brunt of the fabrication(with his spare scrap metal, MIG welder, and grinders/cutters) I don't think I would have bothered..

With this decided, you are going to want to go with the 750w/36v motor, and pump 48v to it - for max power..
Unless you want the yellow mx650, save yourself $100, or more, and buy the MX500, because you are going to replace the motor in either one, anyway..
Chris at TNC Scooters is great for all the parts you will need(~about $170 total in upgrades):
~$20 Extra 12v/12ah battery.
~$40 100a/48v controller
~$38 48v battery charger
~$65 750w/36v motor(*Swaps right in w/no modifications)

*Ok, How fast can you go with this setup? My Son(65lbs) saw 31mph max, using a 15 tooth front sprocket(not stock)/80 tooth rear(stock)=5.33:1 ratio. When we tried any larger front sprockets(to lower the gear ratio) it wouldn't go any faster. Probably because we exceeded the capability of the motor(Horse Power). *I weigh 175lbs and I maxed out between 26-28mph, so you would probably see ~28mph if you weigh ~135lbs...
*Now here is the deal. You have to decide how you are going to use the bike. If you want top speed, you will have to ride on flat hard surfaces all the time, because if you run a 80t/15t=5.33:1 ratio on dirt, jumps or hills, it will feel sluggish, and you may end up frying the motor.
*I tried the top speed thing for fun, but if you want to go in the dirt/jumps small hills(like my son rides) I would suggest a higher ratio.
Before we upgraded to the 1200w/48v motor, we had the 750w/36v in his bike. We tried a 8t front sprocket(80t/8t=10:1) and the thing popped wheelies, had killer acceleration, and had top speed as fast as a stock mx500/36v, 17mph - but believe me, it was way better than a super slow lame stock 17mph mx500 !!! We ride on this dirt course(see my vids), and my son had such acceleration, he left his buddies stock mx500's in the dust!
*Now, the stock gear setup is 80t/11t. This is a fairly good combination for the best of both. It went ~24mph top speed, and had better acceleration than stock mx500's.. *But, if you are going to ride on hilly/dirt courses where you never get near the 24mph top speed, you will have to monitor you 750w motor.. It can overheat.. *Remember, you are pumping 48v 50-100a to a 36w motor.. (*But, we never saw the motor get hot, no matter how my son rode it - when we had 9t or 8t front gears...)
*Now, lets get to my photos. They are of my son's MX1200. He rides this just like a 70-90cc dirt bike. Jumps it like heck, spins dirt out of the corners, ect... It's allot of fun, and you can pretty much get the same out of a 750w upgrade. *About the only difference is, you need to pay attention to the 750w motor. It will be getting the same power as my son's, but it is smaller, and can get warm/hot. If you take care of it, it will be fine.

*When you buy the MX Dirt Rocket, and the upgrade parts, - let aproldan and I know(by posting here) and we will help you through the upgrade process. When you are ready to start, I can send photo’s of where I put what(Extra battery,48v controller, ect) and step you through the process.

- miker71
I have a mx65o, the yellow paint lol, and i am going to modify it using your steps. Is there anything you can tell me about how to get stared? My email is [email protected] and I would love if you gave me help.
MGinn is offline  
Sponsored Links
Advertisement
 
verified
 
Join Date: Apr 2020
Posts: 1
New here and new to the scene. Here's a couple mx650s I have been rebuilding and modding for my kids ( and myself) 😁. 48v 1800 watt brushless mophorn motor and controller I picked up online. I'm using mighty Max 15ah while I'm waiting for the upp 48v 20ah li-ion batteries to get here. The 4 sla batteries get about 15min hard ride time at best. With me riding at 225lbs I can hit 27-28 pretty quickly..lol. I painted and clear coated both as well as overlayed both seats. Added extra padding to the green one. For my own benefit. Haha. These are my first builds.. once I get the lithium batteries in I'll be able to make them look lots cleaner and stream lined. Any advice or comments are more than welcome..
Attached Images
File Type: jpg IMG_20200501_135847152_1588651302931.jpg (497.5 KB, 11 views)
File Type: jpg IMG_20200501_135915130_1588651343586.jpg (513.4 KB, 9 views)
File Type: jpg IMG_20200501_135837447_1588651385639.jpg (488.1 KB, 9 views)
File Type: jpg IMG_20200501_135937409_1588651489786.jpg (493.2 KB, 10 views)
Patrick Anderson is offline  
verified
 
Join Date: May 2020
Posts: 3
Re: MX650 mods?

Hi everyone.

I'm new to this world and am looking to prolong the battery life of my son's MX650 without doing any modifications. I'm not sure if this is possible but the bike is plenty fast enough but even new batteries go dead after about 20 minutes because it is mainly ridden on grass and hills. Is there a lithium ion option that I can purchase and keep everything else the same to give me the longest possible run time? Thank you for all your help.

I'm not sure if this would work but saw this online.

https://www.btrpower.com/collections...0w-1500w-motor

Thank you again for all your help.

Also I noticed that when I am charging his bike the light is constantly red even after a day of charging. When I unplug it then plug it back in the light stays green. Is that a faulty charger?
kevinpak79 is offline  
Sponsored Links
Advertisement
 
verified
 
Join Date: Nov 2019
Posts: 8
I think it’s your battery’s . I no you said there new. What kind of batterys did you get ? How many AH ? My kid rides for a good couple hrs on hers. Only upgrades are a 450w motor and a 450 w variable speed controller and throttle. And charger always green when completed charging .
Russellbugg007 is offline  
verified
 
Join Date: Nov 2019
Posts: 8
Also that’s a nice li battery. I think it will be huge tho, might not fit. And will make the bike heavy for the little ones .
Russellbugg007 is offline  
PBP SENIOR MEMBER
 
silverbullitt7's Avatar
 
Join Date: Apr 2017
Posts: 326
Quote:
Originally Posted by MGinn View Post
Quote:
Originally Posted by miker71 View Post
Filitup,

Ok, based on your private messages to me, you would rather not cut and weld, so the 1200w motor is out.. *I don't blame you - it was quite a job, and if it were not for a good friend of mine to do the brunt of the fabrication(with his spare scrap metal, MIG welder, and grinders/cutters) I don't think I would have bothered..

With this decided, you are going to want to go with the 750w/36v motor, and pump 48v to it - for max power..
Unless you want the yellow mx650, save yourself $100, or more, and buy the MX500, because you are going to replace the motor in either one, anyway..
Chris at TNC Scooters is great for all the parts you will need(~about $170 total in upgrades):
~$20 Extra 12v/12ah battery.
~$40 100a/48v controller
~$38 48v battery charger
~$65 750w/36v motor(*Swaps right in w/no modifications)

*Ok, How fast can you go with this setup? My Son(65lbs) saw 31mph max, using a 15 tooth front sprocket(not stock)/80 tooth rear(stock)=5.33:1 ratio. When we tried any larger front sprockets(to lower the gear ratio) it wouldn't go any faster. Probably because we exceeded the capability of the motor(Horse Power). *I weigh 175lbs and I maxed out between 26-28mph, so you would probably see ~28mph if you weigh ~135lbs...
*Now here is the deal. You have to decide how you are going to use the bike. If you want top speed, you will have to ride on flat hard surfaces all the time, because if you run a 80t/15t=5.33:1 ratio on dirt, jumps or hills, it will feel sluggish, and you may end up frying the motor.
*I tried the top speed thing for fun, but if you want to go in the dirt/jumps small hills(like my son rides) I would suggest a higher ratio.
Before we upgraded to the 1200w/48v motor, we had the 750w/36v in his bike. We tried a 8t front sprocket(80t/8t=10:1) and the thing popped wheelies, had killer acceleration, and had top speed as fast as a stock mx500/36v, 17mph - but believe me, it was way better than a super slow lame stock 17mph mx500 !!! We ride on this dirt course(see my vids), and my son had such acceleration, he left his buddies stock mx500's in the dust!
*Now, the stock gear setup is 80t/11t. This is a fairly good combination for the best of both. It went ~24mph top speed, and had better acceleration than stock mx500's.. *But, if you are going to ride on hilly/dirt courses where you never get near the 24mph top speed, you will have to monitor you 750w motor.. It can overheat.. *Remember, you are pumping 48v 50-100a to a 36w motor.. (*But, we never saw the motor get hot, no matter how my son rode it - when we had 9t or 8t front gears...)
*Now, lets get to my photos. They are of my son's MX1200. He rides this just like a 70-90cc dirt bike. Jumps it like heck, spins dirt out of the corners, ect... It's allot of fun, and you can pretty much get the same out of a 750w upgrade. *About the only difference is, you need to pay attention to the 750w motor. It will be getting the same power as my son's, but it is smaller, and can get warm/hot. If you take care of it, it will be fine.

*When you buy the MX Dirt Rocket, and the upgrade parts, - let aproldan and I know(by posting here) and we will help you through the upgrade process. When you are ready to start, I can send photo’s of where I put what(Extra battery,48v controller, ect) and step you through the process.

- miker71
I have a mx65o, the yellow paint lol, and i am going to modify it using your steps. Is there anything you can tell me about how to get stared? My email is [email protected] and I would love if you gave me help.
It really depends on how much you want to spend. You could go really cheap then just start swapping gears but you exchange torque for top speed and vice versa. You can do like the next guy and do an 1800 watt brushless and hit 27 mph but you're going to get 15 minutes of runtime on SLA batteries and spent or $300 plus a good lithium battery. Topping out at 500 -600 bucks easy. Or go the economical way and put a 24 volt 500w Motor in. You don't have to do anything else. Or do a 36 volt 750w motor and put 48 volts to it which would require a new computer and throttle plus motor and forth battery. Stuff starts adding up quick
silverbullitt7 is offline  
PBP SENIOR MEMBER
 
silverbullitt7's Avatar
 
Join Date: Apr 2017
Posts: 326
Quote:
Originally Posted by kevinpak79 View Post
Hi everyone.

I'm new to this world and am looking to prolong the battery life of my son's MX650 without doing any modifications. I'm not sure if this is possible but the bike is plenty fast enough but even new batteries go dead after about 20 minutes because it is mainly ridden on grass and hills. Is there a lithium ion option that I can purchase and keep everything else the same to give me the longest possible run time? Thank you for all your help.

I'm not sure if this would work but saw this online.

https://www.btrpower.com/collections...0w-1500w-motor

Thank you again for all your help.

Also I noticed that when I am charging his bike the light is constantly red even after a day of charging. When I unplug it then plug it back in the light stays green. Is that a faulty charger?
I have tried five different smart Chargers, ranging from a $20 12 volt charger 2 $60 36 volt Chargers. They all suck. Sealed lead acid batteries work but I've never had them at full Voltage which is 14.7 volts per battery. They've always been a 14 each. That lithium pack should work, you might have to modify it to fit in there. Lithium is definitely the way to go. I have not quite gotten there yet considering I have 8 razor products
silverbullitt7 is offline  
PBP SENIOR MEMBER
 
silverbullitt7's Avatar
 
Join Date: Apr 2017
Posts: 326
Also, those razor Chargers some of them are green all the time, some of them are red all the time. For my mx500 and MX650, my charger does red for about 5 or 6 hours and then goes green. And with 195 lb not going full throttle all the time I can get 30 minutes of ride time with 12 amp hour batteries. My kid at 75 lb can go Full Throttle for 30 or 40 minutes. Weight definitely has a factor and so does throttle control, Full Throttle or half throttle. That is about all you're really going to get, if somebody rides for hours it's because they're not riding Full Throttle and weigh 30 lb. Sealed lead acid batteries will get no more than 45 minutes at Full Throttle with even the lightest person
silverbullitt7 is offline  
verified
 
Join Date: May 2020
Posts: 3
Re: MX650 mods?

Thank you for the replies. I got 3 Duracell Ultra 12V 14AH AGM SLA Batteries from Batteries Plus. Today I timed him riding the bike around in our grass back yard and with a full charge he was able to ride it for 35 minutes.

Are there any other batteries you guys would recommend that would fit well and work without doing any modifications? How much longer ride time can you get from a lithium ion battery? Are there any cons to putting one in besides cost?
kevinpak79 is offline  
PBP SENIOR MEMBER
 
silverbullitt7's Avatar
 
Join Date: Apr 2017
Posts: 326
Quote:
Originally Posted by kevinpak79 View Post
Thank you for the replies. I got 3 Duracell Ultra 12V 14AH AGM SLA Batteries from Batteries Plus. Today I timed him riding the bike around in our grass back yard and with a full charge he was able to ride it for 35 minutes.

Are there any other batteries you guys would recommend that would fit well and work without doing any modifications? How much longer ride time can you get from a lithium ion battery? Are there any cons to putting one in besides cost?
The best way to go would be a Lithium-Ion but build your own pack. I believe it was earlier in this thread a guy did that. I will hopefully build one for my mx500 this summer. I have 12 volt 12 amp hour in my mx500 right now what is stock and if I ride half throttle I can score 45 minutes out of it sometimes more. And that is with some hills but it is all Street. I have a mini chopper that has been overvolted to 36v with 12 volt 15 amp our batteries. But I usually beat on that thing and it only has a 250 watt motor and at Full Throttle I am lucky to do 25 minutes at 23 mph. But every time I charge them I test the batteries afterwards and they are no higher than 14 volts. Max charge is 14.7 / battery. These Chargers do not get these batteries fully charged. I have tried many 12v "smart chargers" and charged the batteries individually and still only got 14 volts. A couple times I've used car chargers and got 14.5 but you really have to watch what you're doing.
silverbullitt7 is offline  
Super Moderator
 
MrKitty's Avatar
 
Join Date: Mar 2014
Age: 39
Posts: 2,079
Garage
The funny thing is this thread has all of the information he is asking about !!!!
And more!!! I don't get it why don't people read then post ...

Faster then a speeding E Revo
MrKitty is offline  
PBP SENIOR MEMBER
 
silverbullitt7's Avatar
 
Join Date: Apr 2017
Posts: 326
Quote:
Originally Posted by MrKitty View Post
The funny thing is this thread has all of the information he is asking about !!!!
And more!!! I don't get it why don't people read then post ...
Yep, it is a pretty long thread as well
silverbullitt7 is offline  
verified
 
Join Date: May 2020
Posts: 3
Re: MX650 mods?

Mr Kitty,

I'm sorry my questions seem redundant. I did read through the posts but didn't come across specific batteries people were using and where to purchase them or how to install it and etc. I am no engineer and just trying to get my son some extra time on something he likes to do. I've been to other outlets and they have all pointed me to come here to ask any questions if I have any doubts. I think that maybe as a moderator of a forum you should encourage new members to ask questions and be eager to share your knowledge.
kevinpak79 is offline  
PBP SENIOR MEMBER
 
silverbullitt7's Avatar
 
Join Date: Apr 2017
Posts: 326
Earlier in the thread, right around page 180 are the links and a lot of the battery talk.....

https://vruzend.com/product/vruzend_basic_kit/

https://www.18650batterystore.com/Pr...SUNG-25R-18650

http://www.walmart.com/ip/Bussmann-D...-Amp/843144279

Last edited by silverbullitt7; 1 Week Ago at 08:38 AM.
silverbullitt7 is offline  
Super Moderator
 
MrKitty's Avatar
 
Join Date: Mar 2014
Age: 39
Posts: 2,079
Garage
Don't forget a BMS ( battery monitor system ) without that the battery pack can go super nova like those crappy hoverboards and a charger capable of charging Li-Ion

If you use the stock motor and speed control don't forget to give the bike a break after 20 minutes for the motor and speed control to cool down

Faster then a speeding E Revo
MrKitty is offline  
PBP SENIOR MEMBER
 
silverbullitt7's Avatar
 
Join Date: Apr 2017
Posts: 326
Quote:
Originally Posted by MrKitty View Post
Don't forget a BMS ( battery monitor system ) without that the battery pack can go super nova like those crappy hoverboards and a charger capable of charging Li-Ion

If you use the stock motor and speed control don't forget to give the bike a break after 20 minutes for the motor and speed control to cool down
Everybody should do that. I guarantee you when I get a lithium pack I will not have a BMS. I will just monitor them. I have RC cars with lipos and I have no monitors whatsoever, I just checked them all the time. But everybody should really have one. I do think that that was also in that same page
silverbullitt7 is offline  
Super Moderator
 
MrKitty's Avatar
 
Join Date: Mar 2014
Age: 39
Posts: 2,079
Garage
Yea but you know how modern batteries work I have li po packs to powering all my RC cars and drones some of it has LVC some things don't but on a drone I would rather puff a pack then lose it...

If you get children and even adults involved it's just a matter of time before somebody runs the battery until the thing won't move anymore and you know as well as I do when that happens that's when things start going bad!!!

Especially if they're trying to charge off of a trash Chinese charger with no fail-safes or no screen to tell you that hay things are going to go bad here!

A battery monitor system (BMS) solves all these problems

also one more thing to know with BMS's and stuff like that I always say make sure you double what you need so if you need 35 amps get a 65 amp BMS...

Faster then a speeding E Revo

Last edited by MrKitty; 1 Week Ago at 11:30 PM.
MrKitty is offline  
PBP SENIOR MEMBER
 
silverbullitt7's Avatar
 
Join Date: Apr 2017
Posts: 326
Quote:
Originally Posted by MrKitty View Post
Yea but you know how modern batteries work I have li po packs to powering all my RC cars and drones some of it has LVC some things don't but on a drone I would rather puff a pack then lose it...

If you get children and even adults involved it's just a matter of time before somebody runs the battery until the thing won't move anymore and you know as well as I do when that happens that's when things start going bad!!!

Especially if they're trying to charge off of a trash Chinese charger with no fail-safes or no screen to tell you that hay things are going to go bad here!

A battery monitor system (BMS) solves all these problems

also one more thing to know with BMS's and stuff like that I always say make sure you double what you need so if you need 35 amps get a 65 amp BMS...

People should for sure. I have four lipos for three RC cars and I do not have the BMS. I have a half decent crap charger and have had no problems. Actually today I just ran a 2s way too low and I was able to save it by throwing it right on the charger. Dropped from 3.5v per cell to 2.5v all in a matter of minutes.
silverbullitt7 is offline  
Super Moderator
 
MrKitty's Avatar
 
Join Date: Mar 2014
Age: 39
Posts: 2,079
Garage
My E Revo has LVC my funny car has it to I don't have it in my boat some of my drones will just return to home when the battery gets low but the raceing drone lol sometimes it will puff a pack here and there especially when it's laying upside down in a field while I'm looking for it for 3 hours you know how it goes!

Faster then a speeding E Revo
MrKitty is offline  
Junior Member
 
Join Date: May 2020
Posts: 1
Re: MX650 mods?

[QUOTE=needspeedjoe;583036] hey I am converting my MX 500 like your and I put the 9 inch shock on but didn’t lift the bike as much as yours! How did you get yours to be that high?
Micarr is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Pocket Bike Forum - Mini Bikes forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may not post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome