MX650 mods? - Page 87 - Pocket Bike Forum - Mini Bikes
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Just hit 500 miles on my bike! But I'm starting to think it's time to get a new motor. And I really want it to be brushless... I've been looking around for them but haven't found much. I want maximum amout of power but I also don't want to sacrifice the speed I already have. I want a ton of torque. Right now, if I gun the throttle I get 6mph, 10 mph, 12, 14 ,16... (speedometer updates every 1 second) ect... my goal is to see double that or more. My main problem is I don't want to run 48 volts... I have never seen a 36 volt brushless motor before... and if I buy a 48 volt brushless motor and controller I will have two problems... first, I believe the motor will loose watts at lower voltage right? And second most of the controllers I see have low voltage cutoff at 41 volts... is there anyway i can disable that? And yes I am still on a budget... I would like to spend less than $150 and no more than $200. Would 1800 watt motor be powerful enough (at least to easily pop a wheelie)? By the way here are the pics I forgot to send of the fans... the last photo is when I gunned the throttle... it took 7 seconds just to get to 20 mph... is that short or is that long? I dunno lol.
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you put more miles on it then i put on my street cruiser lol dam way to go!!!

the biggest motor that you can run on sealed lead acid is 1000watts and thats really pushing it i mean really really pushing it...

they all have low voltage cut off because basically li-po or li-ion is required ( i have heard of people useing battery banks out of broken hoverboards)

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I like the idea of using battery banks from hoverboards... that's definitely something I'll think about... and what type of lipo batterys would I need? And are the chargers expensive?
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to exspeisve i paid 300$ for 2 MaxAmp batterys for my ERevo then there is the charger.

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Then maybe I should go with the hoverboard battery. A 36 volt one... that way I already have the charger (I already have a 36 volt hoverboard)

Last edited by Johnneh; 1 Week Ago at 09:08 PM.
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From what I'm seeing lead acid batterys can send our a ton of watts in short bursts... to be honest that's all I need... if I gun the throttle at 0, it should pull 1800 watts until I get up to speed right... but is it bad for the batterys?

https://www.quora.com/How-much-power...ttery-send-out
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it will melt the tops of the batterys where the leads go inside and the voltage sag will make it LVC (low voltage cut off)

the out put is 8 amps eatch battery...

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That is disappointing... and from what I am seeing is that hoverboard batterys only come in 4 AH... that's definitely not enough capacity compared to the 15 ah per battery I have right now... plus I will have to worry about overcharging the battery.
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this li ion pack will handle 1000watts comes with charger<img src="https://www.pocketbikeplanet.com/images/smilies/smile.gif" border="0" alt="" title="Smile" class="inlineimg" />

if you keep poking around you can find something

its like my RC Monster truck to run 2000watts your going to need 2 of them but look at the plus side thats 24AH &#x1f642; so you will have about the same run time you have now but 2kw about 3 times the power
https://www.ebay.com/i/273969814985?...26pg%3D2385738

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If I do pay $300 batterys... I'm at least going to wait until the ones I have now go bad
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i agree you might as well use up what you have you can upgrade to a 800 watt setup (over volt it ) and still use the SLA bank you have the 800 will just squeez in no modifications required

https://www.amazon.com/L-faster-Elec.../dp/B07BNGQ9JP

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Great! But arnt I already running over 800 watts with my overvolted 500 watt motor?
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Re: MX650 mods?

I upgraded the front suspension .. see video at
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awsome someone did it &#x1f642;

thanks for the awsome video as well.

i was looking at my downhill mt bike a few months back thinking man these marzocchi forks whould fit...

but like your saying you need forks where the head tube has not been cut...

you have to have the through axle type so a pit bike wheel will work...

its a very exspeisve mod and i advise anyone thinking about it to price out the parts befor thinking to mutch about it.

tip any time you buy mt bike forks get a few seal kits as well they go obsolete fast then you cant get parts once this hapends your exspeisve forks become trash becaus of a few 50cent o rings

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Last edited by MrKitty; 10 Hours Ago at 10:25 AM.
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feals like 800 watts... but a 800 watt motor over volted feals like 1000 watts...

the plus side is the 800 will fit where the 1000watt motor you have to grind a notch weakening the bike unless you weld in reinforcements or mount the motor upside down effecting ground clearance.

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Last edited by MrKitty; 10 Hours Ago at 10:14 AM.
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Re: MX650 mods?

Quote:
Originally Posted by MrKitty View Post
you have to have the through axle type so a pit bike wheel will work...
The wheel is actually a custom-built 16 inch double-walled BMX rim with a through-axle mountain bike hub. You could use any wheel and fork setup as long as it is a 1 1/8" straight tube on the fork. You just want the fork, handlebars, wheel, and brake to all be compatible with each other. To do that, you are going to end up replacing all of those and ditching what is on your MX650. I went with the smaller custom wheel to keep the overall height lower. It's actually the stock tire.

[QUOTE=MrKitty;903319]tip any time you buy mt bike forks get a few seal kits as well they go obsolete fast then you cant get parts once this hapends your exspeisve forks become trash becaus of a few 50cent o rings[QUOTE]

Good point, thanks.

[QUOTE=MrKitty;903319]its a very exspeisve mod and i advise anyone thinking about it to price out the parts befor thinking to mutch about it.[QUOTE]

Yes very expensive, if I were looking at cost alone I was probably in it ~$2000 with the original bike, lithium battery, 1800watt kit, suspension upgrades, other misc. Just the fork upgrade you are probably $700-800 to do it right, but you could do it for a bit less. A Sur-Ron I think you can get for a little over $3000, and that is much more of a machine than this. But, building these is what I do for fun. We have a dirt track close to our house and it is a blast. These will go about 2 hours on a charge ripping around a dirt track. No noise to annoy neighbors. With this suspension upgrade I can do a little more jumping.

Attached picture of the track on the previous bike.
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