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Yes find out what your controller can handle but hopefully it's the bigger motor. I have a stock mx500 and a stock MX650 oh, they're the exact same bike other than the motors. You can tell by the seat of your pants and by side by side comparison that the 650 has a little bit more torque and it definitely has about one to two miles an hour more top speed. So if you're going from a 650 to an 800 you still might be disappointed. I would get the Thousand if your controller can handle it. But doing the 9 tooth will give you more of the Accel that you're looking for to start. And because you over volt it already yes you will have a decent top speed
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Re: MX650 mods?

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Originally Posted by silverbullitt7 View Post
Yes find out what your controller can handle but hopefully it's the bigger motor. I have a stock mx500 and a stock MX650 oh, they're the exact same bike other than the motors. You can tell by the seat of your pants and by side by side comparison that the 650 has a little bit more torque and it definitely has about one to two miles an hour more top speed. So if you're going from a 650 to an 800 you still might be disappointed. I would get the Thousand if your controller can handle it. But doing the 9 tooth will give you more of the Accel that you're looking for to start. And because you over volt it already yes you will have a decent top speed
Thanks! I found out my controller can handle a 48v 1000w motor but the seller urged me to stick with overvolting a 36v 1000w motor. The thing is, I cannot seem to see them as frequently as the 48v 1000w motors. The 48v motors are much cheaper as well. Would changing the front sprocket as well as the motor to a 48v 1000w be the same as overvolting a 36v 1000w without a front sprocket change?

Thanks!

P.s. I did see a 36v 1000w motor for $75 but it is in used condition. Buying used worries me.
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They know a 36 volt 1K will realistically only pull about 800 watts at 48 volts...

Get the biggest motor that thing can possibly handle use a small pinion so you don't bog down the electric motor.

Don't forget to buy one of those car audio amplifier installation kits while you're at Walmart and start upgrading all the wiring....

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Hi,

I bought a 2000w brushless motor (https://s.click.aliexpress.com/e/b6NPXu6U) it seems like a nice motor, pulls pretty good. I have 2 issues.

1. Batteries die very fast like 5-10 min run time on brand new 15ah batteries.

2. The gearing is to high, I want to make it have more torgue, but I am having trouble finding a t8f sprocket with 4 holes. Any suggestions? If I cant find one could I get a 3 hole and drill new holes? If I was off a tiny amount would it be noticeable at these speeds?

I'm wondering if the different sprocket will help with battery issue, even full charged, if I hit the throttle the batteries charge drops to 1 bar on throttle display.
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http://www.rebelgears.com can make you a sprocket any tooth count you want.

if your off even a little it will make a tight spot in the chain and it will keep snaping or comeing off or both.

sealed lead acid batterys wont cut it after 1200watts they just dont have enough power density you will need to upgrade i would look into lipo or li-ion options this is the exspeisive part of a big motor swap not onley do you have to buy the bats but you need a way to charge them safely as well.

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Last edited by MrKitty; 06-14-2019 at 12:31 PM.
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Ok thanks. I figured out part of my problem, I had wired my charging plug wrong so my charger wasn't charging the batteries.

I also found a sprocket at electricscooterparts.com I was able to order a 74 tooth, I also went down one tooth on the front, I'm hoping it will give a ton of torque and still go 30ish mph

I had looked at lipos bit in 48v they are pricey! I dis get a lipo 36v for my sons new bike (mx350 with suspension, upgrading from mx350 no suspension with SLA batteries
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i would use a good charger and charg them individually gang charging with those junk chargers will make your battery bank go unbalanced very quickly

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Re: MX650 mods?

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i would use a good charger and charg them individually gang charging with those junk chargers will make your battery bank go unbalanced very quickly



Would I need to charge them individually every time or just once a month or something?

Or

Is there a decent charger that can charge them all at once?

Last edited by sniper695; 06-17-2019 at 07:23 AM.
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the negative side battery will always discharge more than the positive side battery I would say after every four or five charges charg them individually to rebalance the battery bank if you don't the positive side battery will start getting overcharged and the negative side will get under charged this is why people's batteries don't last very long... it's also the reason why one battery always goes bad before the other ones. Good Chargers will have a balance feature built into them like the ones for golf carts of course this involves installing a pigtail on each battery AKA a balance port the way it works is the charger rapid charges the bank until one of the batteries is completely full then it individually checks each battery and tops each one off

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Re: MX650 mods?

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the negative side battery will always discharge more than the positive side battery I would say after every four or five charges charg them individually to rebalance the battery bank if you don't the positive side battery will start getting overcharged and the negative side will get under charged this is why people's batteries don't last very long... it's also the reason why one battery always goes bad before the other ones. Good Chargers will have a balance feature built into them like the ones for golf carts of course this involves installing a pigtail on each battery AKA a balance port the way it works is the charger rapid charges the bank until one of the batteries is completely full then it individually checks each battery and tops each one off
That is WAY over kill and unnecessary. Just charge them normally Like Razor recommends and they will last years. Literally. Mine always have. And I've had 20 or more different type Razor products. NEVER had a problem with batteries.
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yes but your not pulling 3x more power out of the bank over stock he is running a 2k watt motor

if you want to balance your battery bank on a budget you can run 4 Harbor Freight float Chargers over night then when you wake up in the morning all four batteries will be topped off and ready to go...

Keep your batteries on the float Chargers while your bike is not in use to preserve the batteries.

Don't be lazy take good care of your battery bank and it will last a long time.

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Re: MX650 mods?

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Originally Posted by MrKitty View Post
yes but your not pulling 3x more power out of the bank over stock he is running a 2k watt motor

if you want to balance your battery bank on a budget you can run 4 Harbor Freight float Chargers over night then when you wake up in the morning all four batteries will be topped off and ready to go...

Keep your batteries on the float Chargers while your bike is not in use to preserve the batteries.

Don't be lazy take good care of your battery bank and it will last a long time.
I agree with the part about taking care of your batteries and with that involves the correct and right type of charger that can de-sulphite the battery when needed.............

Simply doing a proper charge wont always produce perfect results with SLA batteries especially if load draw heats the last battery up and messes with the internal ecosyetem going on behind the safety valve.............

Once a safety valve burps some of the disturbed environment out of the case it becomes slightly different from the rest of the batteries....

Thats why its also good practice to note and rotate the batteries often too........

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Last edited by CAM2; 06-19-2019 at 11:14 AM.
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people keep asking how can i properly charg all 4 batterys at once and keep my bank balenced its simple with the right charger this charger allso de sulphates as CAM2 stated so the onley thing you have to do is number and rotate your bats allso a very important thing as CAM2 stated

these chargers allso test the batterys as well and will let you know if you have a battery go bad unlike those china gang chargers where if a battery goes bad it just over charges and cooks the remaining good ones (not a big deal becuse if one battery goes bad they should all be replaced at the same time anyway) (but the remaining good ones could be repurposed for other projects)

https://www.batteriesplus.com/produc...BoCMMUQAvD_BwE

AutoZone sells these chargers as well if your on a budget you can get a single charger and charge them one at a time...

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Last edited by MrKitty; 06-19-2019 at 12:06 PM.
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I finally bought new 15 ah battery and they last so long! (At least compared to my old broken batterys) but I ran into a problem.. the motor gets extremely hot after about 6 miles of hard use. Is there any way that I can keep the motor cool and not have to take very long breaks just to wait for the motor to cool off?
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get some computer fans tap off 12 volts and wire them to a switch remember to check the motors temp every so often with a temp gun or you can just do the finger test you can get the temp gun at Wal-Mart

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What do you mean by "tap off 12 volts" and will the fans use enough power for a noticable drop in range?
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you just need to find where you have 12 volts to wire up some fans i whould put one blowing across the speed control and maybe 2 on the motor if you can fit two computer fans are extremely efficient they wont effect run time well unless you forget to turn them off and they run for lile 2 weeks

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Cool! So should I go for something like this? Or do I need more rpm? And how would I control the fans? If I attach them to one of the batterys will they turn off when I turn the bike off?
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Cool! So should I go for something like this? Or do I need more rpm? And how would I control the fans? If I attach them to one of the batterys will they turn off when I turn the bike off?
https://www.ebay.com/p/Case-Fans-12v...put/2214745666
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Last edited by Johnneh; 06-28-2019 at 08:49 PM.
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120mm is big you want 80mm ones just get them out of old junk computers
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