Pocket Bike Forum - Mini Bikes - Reply to Topic
Thread: MX650 mods? Reply to Thread
Title:
Message:
Trackback:
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:
 

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










  Additional Options
Miscellaneous Options

  Topic Review (Newest First)
1 Week Ago 04:05 PM
MrKitty Keep up the good work electric vehicles are the future...
1 Week Ago 09:41 PM
Johnneh I tried this and nothing special happened. And my freewheel is locked
2 Weeks Ago 08:31 PM
CAM2
Re: MX650 mods?

Quote:
Originally Posted by Johnneh View Post
i rode 3.5 ah out of it today, and it just started to stutter. I think the cold has a lot to with with it because of the voltage sag... the controller has its own low voltage cutoff and it was able to sag to 41 volts before i felt it cut off, but it normally starts taking away power at 43 volts...

i uploaded a new 0 to top speed video by the way, here it is: https://youtu.be/WqmrVJ8_FxY
I had to sit up as far front in the seat as i could so the bike wouldn't throw me off again
Sounds to me it maybe a problem with a FET if its a crystalline type controller....When these FETs blow, they take out the gate drivers and drive current limiting resistors inside the controller...

Turn the power off and if you don't have a freewheel try pushing the bike forwards and backwards on the ground and see if the motor jerks and gives a reaction when the power switch is in the OFF position...If it does you have an open circuit to one of the magnets and your motor is in a downward spiral unless disassembled and fixed or your controller needs replacing/repair......

Good Luck
2 Weeks Ago 07:47 PM
Johnneh
Re: MX650 mods?

i rode 3.5 ah out of it today, and it just started to stutter. I think the cold has a lot to with with it because of the voltage sag... the controller has its own low voltage cutoff and it was able to sag to 41 volts before i felt it cut off, but it normally starts taking away power at 43 volts...

i uploaded a new 0 to top speed video by the way, here it is:
I had to sit up as far front in the seat as i could so the bike wouldn't throw me off again
2 Weeks Ago 07:41 PM
MrKitty Right on sounds like that was it
2 Weeks Ago 07:20 PM
Johnneh I rode it 6 miles today and used 3 amp hours... and it's fantastic!! My voltage is currently 50 volts.. it still stutters when I launch with the brake, but only for half a second. And when I let it sit for a while it didnt stutter at all (Still poppin wheelies 🤣 )

It holds the voltage a lot better now..


This might all be because it was almost 60F... I dont know for sure though.. I'll experiment more on Wednesday when its colder

Oh! And it's faster as well, I was going 27 for like the entire time I was riding (normally my top speed dropped down the 24 - 26 after 1 ah)
2 Weeks Ago 03:11 PM
MrKitty 38 volts is where damage starts happening
2 Weeks Ago 02:34 PM
Johnneh Done! I didnt have to do anything with the negative because it wasn't connected to the bms
2 Weeks Ago 01:27 PM
Johnneh How low do you think I can go? I know I have to stop at 42 volts, but if I accidentally go to 39 or 40 volts, how bad would it be?
2 Weeks Ago 01:24 PM
MrKitty Yup just take it and hook it right to the positive and negitive buss to the power meter to the speed control then be aware of your voltages on your own don't forget to keep an eye on it
2 Weeks Ago 11:55 AM
Johnneh So if i connect another wire inline where i pointed the arrow it will bypass the BMS right? And not ruin anything


That's an old picture by the way
3 Weeks Ago 11:11 PM
MrKitty Just hook up your positive and negative before it instead of after it
3 Weeks Ago 10:30 PM
Johnneh I think tommorow I'm going to bypass it...

Could you explain to me how to bypass it?
3 Weeks Ago 10:25 PM
MrKitty I think so as well ( BMS is over heating and cutting out early ) it really should have a 60 amp BMS

You should be able to use 8 ah out of that pack
3 Weeks Ago 10:10 PM
Johnneh I used up 4.366 amp hours today

I charged it up and the charger put in 4.565 amp hours...

I seriously think my BMS is the cause of the stuttering... I think maybe the voltage sags a little more because of the cold, and the BMS overreacts amd starts taking away my amps to keep the voltage up. (It will literally stutter while I'm full throttle and the meter reads 47 volts.)
3 Weeks Ago 01:14 AM
MrKitty Way to go it looks good now you will have the numbers
3 Weeks Ago 08:42 PM
Johnneh Got it all hooked up...

I didn't have a chance to ride it today, but I will try my best to tommorow
3 Weeks Ago 03:06 PM
MrKitty XT60 plugs are the way to go I use them on everything you can make an adapter.
3 Weeks Ago 02:11 PM
Johnneh I've been thinking about that. I would have to modify my charger though, to be able to switch between xt60 and the normal barrel connector... I have an idea in mind...


If it works well I'll buy another meter and attach it to my charger.
3 Weeks Ago 01:35 PM
MrKitty Ok well it's full give her another run and see what happens...

There has got to be some kind of charging meter you can hook inline and see how maney AH you putting in maybe you can hook your battery meter to the charger so you know how mutch your putting in...
This thread has more than 20 replies. Click here to review the whole thread.

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

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