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The saga continues.... I swapped in a 48V - 1000W Motor rated at 26.7a and it is slow. Runs smooth and stayed cool but not what I expected. I was thinking of adding another battery and going to 60v to see if that will make it zing :). Any ideas?
 

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You have to be conscious of throttle when you're running an over volted system every time you go past 75% throttle your killing it. Just like adding a turbo or nitrous to a stock engine yeah it's fun but every time you use it it's killing it.

It's always best to upgrade the motor and speed control at the same time then adjust the gearing to rider weight you can go up to 1000 watts on the stock batteries any more than a thousand watts and the batteries will start melting and we'll have to be upgraded to lithium ion or lithium polymer and a charger to match whatever you go with
 

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You have to be conscious of throttle when you're running an over volted system every time you go past 75% throttle your killing it. Just like adding a turbo or nitrous to a stock engine yeah it's fun but every time you use it it's killing it.

It's always best to upgrade the motor and speed control at the same time then adjust the gearing to rider weight you can go up to 1000 watts on the stock batteries any more than a thousand watts and the batteries will start melting and we'll have to be upgraded to lithium ion or lithium polymer and a charger to match whatever you go with
I get it.. If I had good launch and poor top end or vice versa I would look at gearing however it is slow on both.. I went ahead and added the 5th battery and its slightly quicker. My only guess at this point is to swap out the controller. I verified that I am getting 60v at the motor but I don't have a way to measure amps.
 

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I get it.. If I had good launch and poor top end or vice versa I would look at gearing however it is slow on both.. I went ahead and added the 5th battery and its slightly quicker. My only guess at this point is to swap out the controller. I verified that I am getting 60v at the motor but I don't have a way to measure amps.
That's a tough call could have a bad brush or bad winding in the motor or those controllers use a stacked parallel mosfet design so it is possible for a couple of mosfets to die in those controllers and it will still work but will not deliver the amps.

If you hook the motor up directly to the battery pack with the chain off and the motor seems to run okay without varying speed up and down I would point my finger at the controller...
 

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The saga continues.... I swapped in a 48V - 1000W Motor rated at 26.7a and it is slow. Runs smooth and stayed cool but not what I expected. I was thinking of adding another battery and going to 60v to see if that will make it zing :). Any ideas?
With the 48v.1000w setup, how fast is it? Flat ground GPS. My guess is 22-23mph. Take off 'should' be better.
Overvolting adds power quick at the expense of longevity.
I am just curious, i have overvolted lots of 24v to 36v (always the mx500/MX650 controller) and an MX500 by installing a 24v 500w motor.
I have heard lots of people going 48v on the stock MX500 w motors and tge stock MX650 motors. One guy claimed, 30-32mph but I can't remember if he regeared it. But it had gas dirtbike rims spoked to the original hubs. 10in rear and 12in front. I couldnt verify that speed, but that was his story.
 

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With the 48v.1000w setup, how fast is it? Flat ground GPS. My guess is 22-23mph. Take off 'should' be better.
Overvolting adds power quick at the expense of longevity.
I am just curious, i have overvolted lots of 24v to 36v (always the mx500/MX650 controller) and an MX500 by installing a 24v 500w motor.
I have heard lots of people going 48v on the stock MX500 w motors and tge stock MX650 motors. One guy claimed, 30-32mph but I can't remember if he regeared it. But it had gas dirtbike rims spoked to the original hubs. 10in rear and 12in front. I couldnt verify that speed, but that was his story.
He was running li ion they can easily deliver all the amps
 

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JDMX500 is running li ion??
The 48v 500w guy with the dirt bike wheels that I met was running lead acid. All four. I just never rode it to verify the top speed. I saw the dirt bikes. They were really cool, especially the red rims with street tires, I was thinking he might have been hittin 25-26.
 

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I was thinking of a different person I'm talking about the guy that likes to put downhill mountain bike forks on them

It takes 1800 watts to get them up to 35mph
 

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I was thinking of a different person I'm talking about the guy that likes to put downhill mountain bike forks on them

It takes 1800 watts to get them up to 35mph
@MrKitty you were right. One of the brushes was stuck open on the new motor. Its better than before but still on par with my 48v 650. I know the extra battery adds a few pounds but the additional volts should make up for it. I verified I am getting just over 60v at the motor. I am thinking to swap out the SLA batteries for Li ion. Any recommendations I should be looking out for or expectations from them?

@Atvrunner2 I have not done a speed test on it yet only because it does not seem to be running at its optimal performance. This is the 3rd 650 I mod to 48v and it is just a bit slower.
 

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That's crazy that this is your third one and it's slower, it just goes to show that sometimes you never know. Even the gas pocket bikes, you could have three of the exact same engines and they will all three run different.
Glad you found a problem that you can fix. Some people say not to use those cheap blue ones on eBay, other people have used them and they are totally fine.
I'm up in the air with those, a few times I bought lithium packs off of a website, 36 volt 10 amp hour with charger for about 165 shipped. Either way if you spend $100 on 15 amp SLA's for 150 with charger for one of those cheap eBay blue ones that are safe 14 amp hour, I think you're fine, because the sla's will only last a few years and I'm sure you'll get more out of the lithium cheap Pack, but even if not I think it's still worth it because they do run longer and are lighter.
My lead acids were 26.6 lb and the one lithium pack was 3.3 lb
I will try to dig up the website if you would like it
 

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That's crazy that this is your third one and it's slower, it just goes to show that sometimes you never know. Even the gas pocket bikes, you could have three of the exact same engines and they will all three run different.
Glad you found a problem that you can fix. Some people say not to use those cheap blue ones on eBay, other people have used them and they are totally fine.
I'm up in the air with those, a few times I bought lithium packs off of a website, 36 volt 10 amp hour with charger for about 165 shipped. Either way if you spend $100 on 15 amp SLA's for 150 with charger for one of those cheap eBay blue ones that are safe 14 amp hour, I think you're fine, because the sla's will only last a few years and I'm sure you'll get more out of the lithium cheap Pack, but even if not I think it's still worth it because they do run longer and are lighter.
My lead acids were 26.6 lb and the one lithium pack was 3.3 lb
I will try to dig up the website if you would like it
Thanks for the response. That's a nice weight savings, i'll keep watch for it. Should I be worried about the reduced amps between the SLA's and the Lithium packs?
 

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You can use those cheap ones as long as you understand the risk and know that most of the time they catch on fire while they are charging or in use

Understand that the cells are the same thing that are used in all those hoverboards that were recalled in the US!!!


You always think it won't happen to you until it happens I walked in and stopped the charger just in time!!!
 

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The lithium as far as I know, can be less and still perform the same as SLA. Mine have been ok so far.
And ALWAYS be around your charging lithium packs, no matter lithium- ion, lipo, or LiFeo4.
I have only left sla's charge overnight and out of sight but still sketchy.
 
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