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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?
I hate to bust your bubble, but needspeedjoe hasn't had a post in 2 years. I hope he answers for you but he probably won't. How high are you looking to get the bike? I run the stock shock and I'm 185 lb. I like it, not everybody does I understand that. Let us know a little more information , maybe we can help you. I've had Buddies who put 9 10 11 and 12 inch shocks on them, they rode very back and high. They just didn't ride as well. Are you bottoming out, and that is why you're looking for something taller?
 

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MX650 Rear Tire Change and Fresh Look! Tips for replacing the Razor MX650 or MX500 rear tire, which is a royal pain. I'm also painting the back rim and adding some spoke protectors for a fresh look.

 

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MX650 Rear Tire Change and Fresh Look! Tips for replacing the Razor MX650 or MX500 rear tire, which is a royal pain. I'm also painting the back rim and adding some spoke protectors for a fresh look.

The front one is easy for sure, 10-15 minutes at the most. That rear one took me about an hour including removal and install. I contemplated swapping out my whole rear wheel next time but they are pretty pricey, I might just go for the hour and swearing again. Ha
 

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I'm so happy that I found these forums, before this, I was asking anyone and everyone about mx650 mods but still bit the bullet and bought one.... 48v 2000w and definitely in the 30mph club. Now I'm moding the forks like in the other forum w/ upgraded springs and spacers for more ride height, then the lights and brake lights are next along w/ turn signals and everything else but I'm pretty sure I'm addicted because now I'm jumping from 48v 2000w to 60v 3000w w/ the 3 speed controller and switches.... Probably be adding an anti theft alarm and separate electric system for the lights and stuff so I can charge my phone and camera gear while riding around and towing my son in his bike trailer. I can put up some pics but I'm still in the process of getting some stuff welded and repaired and I don't like the green color on the frame.... Most likely over winter I'll be repainting it w/ a red on black w/ white theme because it matches my BMX bike.
 

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I've been coming here for a few things since I'm building 2 MX for my kids. Ones complete the other almost is. Blue one is just a hopped up 36v and a different controller. Paint and plastic batteries and bars/grips and shock.

The other is 48v 15ah 1800w brushless. With custom downhill forks and 160mm front and rear disc with MTB calipers. Rear shock, and other stuff. Still waiting on direct mount 31.8 bar mount and handlebars and it'll be finally finished!
Thanks took a few ideas from a couple people here and on YouTube.
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Good job they look awesome I like the one with the downhill Mt bike forks killer job on the mod!!!
 

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Fix Stuck Razor MX650 Forks!! Disassemble, fix, lube, and reassemble stuck Razor MX650 or MX500 forks. If your forks are binding and won't move any more, this video will most likely get them moving again. I also show all of the internals and parts of the forks and how they work.

 

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Install a 48v 30Ah Lithium battery in your Razor MX650!! It's a tight fit, but will fit in your MX650 or MX500. I estimate this will give you 3-4 hours of constant hard riding run time with the 1800watt 48v upgrade. Please like and subscribe.

 

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Done! I didnt have to do anything with the negative because it wasn't connected to the bms
Hey FINALLY had the money to upgrade my mx500. I took the stock throttle and computer and motor off and put on a shelf for backup. I bought a fast scooters 36 volt controller and throttle with key and voltage readout. Then I put a 24 volt 500 watt motor in.
On the stock 12 volt 12 amp hour batteries which are a year-and-a-half old and are not in the best shape, I went 23 mph everywhere with a slight downhill at 25. Runs great. I have a lithium pack that I need to install.
 

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So I've had a couple MX500's converted over to a 48v brushless setup for a couple years now running on lead acid batteries. I highly recommend the brushless setup if anyone is thinking about converting, it was fun even on the lead acid setup.

I finally splurged and bought 84 of the new Panasonic 21700 40T cells to make two 52v battery packs. They are supposed to be one of the best lithium cells released the last couple years with a 35a discharge rating per cell. My brother has a nice 3D printer so I had him print up some 4 cell 21700 NESE modules. I have some pics of them split up but all 14 fit perfect in the bottom tray. I'm just waiting for the hardware to finish the modules to arrive from Europe so it could take a few weeks.

Here's an old pic before the brushless setup.
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Nice!! If I ever decide to go brushless I'll definitely go with a 1800 or 2000 Watt. Right now I am quite content with my 24 volt 500w. As with most people run time is most important. Got to get my lithium pack installed.
 

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So I've had a couple MX500's converted over to a 48v brushless setup for a couple years now running on lead acid batteries. I highly recommend the brushless setup if anyone is thinking about converting, it was fun even on the lead acid setup.

I finally splurged and bought 84 of the new Panasonic 21700 40T cells to make two 52v battery packs. They are supposed to be one of the best lithium cells released the last couple years with a 35a discharge rating per cell. My brother has a nice 3D printer so I had him print up some 4 cell 21700 NESE modules. I have some pics of them split up but all 14 fit perfect in the bottom tray. I'm just waiting for the hardware to finish the modules to arrive from Europe so it could take a few weeks.

Here's an old pic before the brushless setup.
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Wondering what your suspension mods are. Looks like a 750lb rear spring. Care to share a brand name or link? Also have you modified the front springs?
 

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I haven't done anything to the forks yet. The rear is a DNM DV-22AR mountain bike shock in the 200mm size. I think it's the longest length you can go before the bike starts looking ridiculous.


It does come with a 750lb spring but it is way too stiff. I contacted DNM and they sell springs down to 350lbs. The springs are cheap at only $10 bucks but they want an additional $50 for shipping to the US. They said they got no US dealers for the springs. I think maybe between a 450-550lb spring would work best but I didn't wanna spend the money to experiment.
 

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I ride with the stock rear shock. But I am only 190 on a heavy day. Been good. Fronts to suck. I am looking at a 50cc pit bike whole front fork with hydraulic brake and wheel setup. I guess the people that use the bicycle setups have a better idea, lighter is always better. But we will see. For me first step is past... already 36v overvolted 24v 500w motor, cruising at 23-25mph. Now lithium pack. Next new wheel bearings and true in the wheels.
 

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I've had the pack built for a couple months and it's been running great. I built it using Samsung 21700 40T cells with N.E.S.E. modules that you don't have to solder. They work great and I highly recommend them if you guys want to built battery packs without having to solder tabs together. Here's a link to his site:


He's got the modules available to 3D print yourself or you can can purchase from him. My brother has a good 3D printer so I just had him print the modules for me. Here's some pics of the battery build process. I used 14 of the 4 cell modules to make a 52v pack. This is what the modules looked like opened up. You just insert the batteries inside and they are pressure fit.



Here's the pack arranged with the BMS wires attached.


I used a XT90 anti-spark for the main connection with a XT60 for the charge cable. I connect the XT60 charge cable is connected to the stock XLR charge port.


Here's how everything is mounted.


The pack fits perfectly in the bottom tray, I used a cheap dollar store cutting board as extra insulation on the top of the pack. I was even able to use the stock battery bracket but with longer screws. I mounted the controller diagonally in the tray with a rubber reusable zip-tie.






Everything fits inside the stock case perfectly.




The pack fully charged is 58.8 volts and I top out at ~27mph according to GPS. This is all with stock gearing. I've been on the stock chain for a few years on the 48v lead acid setup and I've had no issues. So far it's been fine on the 52v lithium setup.
 
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