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I added some new foot pegs and lowered them by 2 inches. This makes it much more suitable for my large body frame.

Between this and the handle bar risers, I can even stand on the pegs while riding and not be hunched over.

Costs about $15.00 from parts purchased at Home Depot.
Do you have a link or name for the metal extender you got at Home depot? Did it come with the foot beg bar and all? Do the original foot-pegs screw into that new extender or no?
 

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Below is video I made to help other upgrade there Razor MX650, MX500 or SX500 to go 35 mph for $300. I feel this is best value build out there and having 3 speed throttle allow control for different riders and conditions. You can build bigger and better but it will cost $500+.

 

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Not sure it hasn't been posted here (can't find any way to search a specific thread) but an easy way to get an extra ~2.5" seat height on MX500/650 is to install the shock for an SX500.
I'm currently running it on the upper mounting holes and it supports my 230lbs nicely, could move to lower mounting hole for a bit higher seat and slightly less firm ride for lighter riders.
Got mine from Razor in about a week: SX500 Shock Absorber - Razor
Now working on raising the forks an inch or two to get back some of the front rake, but perfectly rideable as is.
159737


159738


SX500 vs MX500 shock
159739
 

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What's your poison? Mine is 40:1
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Huh, never tried that one. Tried many gas pitbike ones, almost always go back to stock. I like the ride better but I am under 200. I really want to try crf50 pitbike clone front forks. I know pleanty have done the mountain bike forks.
 

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If the labels are to be believed the SX500 has a softer spring than MX500/650, 550 vs 650lb/in but I suspect the mounting hole location high or low has at least as large an affect on deflection with rider. Not that it's that complicated, just too lazy to do the force balance equation lol
For $15 it's hard to beat, especially since if you don't seriously upgrade the front forks putting on just a better quality rear one doesn't make a lot of sense.
 

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What kind of controller is it? We're going to need some more pictures and definitely the model. Some of us have messed with the bigger controllers, some have not.
 

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Can you recommend a 48V motor that doesn’t require any frame modifications? Anything that is bolt in ready?

Filitup,

Ok, based on your private messages to me, you would rather not cut and weld, so the 1200w motor is out.. *I don't blame you - it was quite a job, and if it were not for a good friend of mine to do the brunt of the fabrication(with his spare scrap metal, MIG welder, and grinders/cutters) I don't think I would have bothered..

With this decided, you are going to want to go with the 750w/36v motor, and pump 48v to it - for max power..
Unless you want the yellow mx650, save yourself $100, or more, and buy the MX500, because you are going to replace the motor in either one, anyway..
Chris at TNC Scooters is great for all the parts you will need(~about $170 total in upgrades):
~$20 Extra 12v/12ah battery.
~$40 100a/48v controller
~$38 48v battery charger
~$65 750w/36v motor(*Swaps right in w/no modifications)

*Ok, How fast can you go with this setup? My Son(65lbs) saw 31mph max, using a 15 tooth front sprocket(not stock)/80 tooth rear(stock)=5.33:1 ratio. When we tried any larger front sprockets(to lower the gear ratio) it wouldn't go any faster. Probably because we exceeded the capability of the motor(Horse Power). *I weigh 175lbs and I maxed out between 26-28mph, so you would probably see ~28mph if you weigh ~135lbs...
*Now here is the deal. You have to decide how you are going to use the bike. If you want top speed, you will have to ride on flat hard surfaces all the time, because if you run a 80t/15t=5.33:1 ratio on dirt, jumps or hills, it will feel sluggish, and you may end up frying the motor.
*I tried the top speed thing for fun, but if you want to go in the dirt/jumps small hills(like my son rides) I would suggest a higher ratio.
Before we upgraded to the 1200w/48v motor, we had the 750w/36v in his bike. We tried a 8t front sprocket(80t/8t=10:1) and the thing popped wheelies, had killer acceleration, and had top speed as fast as a stock mx500/36v, 17mph - but believe me, it was way better than a super slow lame stock 17mph mx500 !!! We ride on this dirt course(see my vids), and my son had such acceleration, he left his buddies stock mx500's in the dust!
*Now, the stock gear setup is 80t/11t. This is a fairly good combination for the best of both. It went ~24mph top speed, and had better acceleration than stock mx500's.. *But, if you are going to ride on hilly/dirt courses where you never get near the 24mph top speed, you will have to monitor you 750w motor.. It can overheat.. *Remember, you are pumping 48v 50-100a to a 36w motor.. (*But, we never saw the motor get hot, no matter how my son rode it - when we had 9t or 8t front gears...)
*Now, lets get to my photos. They are of my son's MX1200. He rides this just like a 70-90cc dirt bike. Jumps it like heck, spins dirt out of the corners, ect... It's allot of fun, and you can pretty much get the same out of a 750w upgrade. *About the only difference is, you need to pay attention to the 750w motor. It will be getting the same power as my son's, but it is smaller, and can get warm/hot. If you take care of it, it will be fine.

*When you buy the MX Dirt Rocket, and the upgrade parts, - let aproldan and I know(by posting here) and we will help you through the upgrade process. When you are ready to start, I can send photo’s of where I put what(Extra battery,48v controller, ect) and step you through the process.

- miker71
 

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Can you recommend a 48V motor that doesn’t require any frame modifications? Anything that is bolt in ready?
Any particular reason you want a 48v motor?
A 36v 800w motor bolts in, you can run a 48v 1000w controller, and lithium battery and have fun. Or follow theraddad on here, he modified the stock 36v controller and is running the 36v/800w motor and 48v lithium pack. Saves you $70-$100 for the 48v controller setup. The only 48 volt Motors that I know that fit are less than 800 watts. I heard the 1800 watt brushless setup almost bolts in.
 

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Already upgraded to 48 v system, looking to upgrade the motor now.
Any particular reason you want a 48v motor?
A 36v 800w motor bolts in, you can run a 48v 1000w controller, and lithium battery and have fun. Or follow theraddad on here, he modified the stock 36v controller and is running the 36v/800w motor and 48v lithium pack. Saves you $70-$100 for the 48v controller setup. The only 48 volt Motors that I know that fit are less than 800 watts. I heard the 1800 watt brushless setup almost bolts in.
 

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48 volt motor is a tad longer. But should fit, do some due diligence, they give you measurements on that website
 

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If
I would run the 36 volt 800 watt motor on it no. You get more RPMs which equal top speed. And it's Bolton. Electricscooterparts.com has motors. But I need motors that have the 1020 case. Here is a pic.
If I'm mistaken there are 48v brushed motor controllers and that's the type he owns then yeah I 100% agree with the 36v 800w motor swap. I love my 36v 800w motor on 48v, thing rips wheelies with my 185lbs on it! The only thing to be wary of is they WILL get HOT! Mine is running the 11/80t combo and after 15 minutes of flatland full throttle riding you cant put your hand on the motor longer than 2 seconds so I'd highly recommend either swapping in a 9t front or 89t rear (stock sprocket size of the pocket mod scooters, you'll have to lengthen the chain about 5 links for that) to help decrease work load on the motor and help combat heat.

As far as 48v brushless motors go (in case you have a brushless controller) the most common I see are 1800w and 2000w which appear to be a direct bolt in replacement from what I gather so long as you acquire the face mount style without the mounting bracket. If you acquire the base mount style of ANY my1020 motor you will have to cut the base mount off to fit the motor into the swing arm. Almost all of the motors have bolt heads exposed instead of recessed like the oem motors do and that's a problem. You can remedy this by drilling out recesses in the cap of the new motor and using the Allen head style bolts off your original motor and if you pick up an 800w motor with a base plate you can swap cases with the stock motor as the base on those are a bit of a pain to remove since they're steel... the brushless motor cases are aluminum so cutting the base off is a breeze.

do not buy the 36v or 48v brushed 1000w motor! IT DOES NOT FIT! they are too long and will require substantial modifications to the swing arm to make it fit...
 

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The only thing to be wary of is they WILL get HOT!

Is that with you on it, or one of the kids? The reason I ask, I won't be riding and my daughter is under 100 lbs running basically flat ground.
 

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Less weight will definitely have a longer run time before it gets hot. Good rule of thumb, 15min then cool down.
If.full throttle the whole time, 10min run or less before cool down.
 

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It will fit you have to grind off the mounting bracket and the case bolts just a little bit.
 

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It will fit you have to grind off the mounting bracket and the case bolts just a little bit.
The 1000w brushed motor???
I have one out of a monster moto 1000. But I also newly own a monster moto 1000. MINT condition. Ill put up pics soon. Totally forgot about it. Very comfortable ride.
 
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