stock the bike has a 9t pinion, so you 9-18= 9tooth diff
you will need 7links of chain, you subtarct 2 links from the 9 you needed for the two chain masters you will have to use.
it is simple, but I worn you, you will fry somthing with that gear set up unless your pushing almost 2hp to make the speed that that gear ratio is intended on : mid 30's
if you ask me your wasting money, keep the MX as an off road bike. If you want onroad speed, then buy a pocket bike
I want my MX650 to be onroad and offroad type of bike, but i still want it to go fast, but not loose torque. Does anyone have any good suggestions? I don't want to do any cutting or welding though. Maybe a smaller front like a 15 maybe?? or a 65 rear??? I am really quiet the noob, so I don't really know a lot about electric dirt bikes. I have been researching for a while though. Give me a suggestion on what would make me go fast! that would be great
1 more question. Everyone says that a blue motor is better than a black one, because I found a blue 750 watt 36V motor for 35.00$ brand new. I was wondering, is it actually better to go with a blue one???
Sorry for the silence. I've been away on assignment. With regards to your bike plans, there are plenty of conversions posted in these forums. I know it's painstaking, but you can learn quite a bit from reading through them.
Adding an extra battery and the 48v controller should be easy enough. You may have to use the end cap of your original motor if you plan to buy the 36v 750-watt motor to make things work. But I think it's not too difficult to do either.
I am plenty happy with my bike which has a 900-watt motor, 14-tooth sprocket and running at 60v. Granted, I discovered that my motor controller was actually a rare YK42-6 model, which is rated at 48-60v. I've been trying to find another one, but that's akin to a bigfoot sighting.. So my current target is modifying the YK42-4 (rated at 48v) to handle more voltage. People have done it with a few mods but it's off topic and definitely bit more involved.
Anyway..With all that, I can run consistantly at 28mph on the street until the batteries are drained. I get plenty of torque off the line. Riding up hills or in tall grass heat things up a bit, so I limit my run time there. Overall, this is a comfortable setup for me.
I think you might want to try a 24v 500-watt motor. If you run this motor at 48v with the stock sprocket, you'd be surprised at the results. I think it's the cheapest/easiest way to get more reliable performance. All can be had from TNC scooters.
BTW, if you're referring to the blue motor on Ebay, check the shipping charge. I think it's something like $50..
I am trying to have my MX650 go as fast as possible without draining the torque and I was curious if you thought that the 24V 500 motor and that setup was better, performace wise, compared to the 750 watt 36V. Also, how did you fit 60V of battery in there??? Did you have to do any fabrications???
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You said that the 24v 500 watt was the cheapest/easiest way, but I don't that have THAT much of a limit, since the upgrade will be a b-day present from my folks. So, easiest may come into consideration, but I want top performance. If you guys could give me the BEST mod choice that doesn't include a fabricating (but possibe modding, that doesn't include fabricating) that would be GREAT!
One more thing Killaj,
How did you find all of your parts??? If you know where ANY of the parts are of the setup you did, I want a setup just like yours! lol
I started out just like you (gosh, now I sound like a grandpa!!). Found myself with a MX-350 that I bought on sale at Toys-R-Us as a joke after I rode it around in the store and nearly got kicked out. That bike comes stock with a 350-watt motor and 24v in batteries. I just poked around on the internet and found the TNC Scooters website a couple of years ago. I ordered a 48v controller and two extra batteries. That bike, running with a 350-watt motor@ 48v was a blast! I think top speed was around 20mph, certainly not a torque monster by any stretch of the imagination, but it moved out pretty well. My girlfriend liked it much more than I did. I'm 200 lbs and she's maybe 115 lbs.
I bought a house next to a park and we began riding the bike at night in there with no problems. After taking turns, the obvious logic was to buy another one. That's when I found this website.
After buying a MX-500 in November, I read all the posts I could find here. AndyS posted a link about an advertised 900-watt motor on Ebay and I picked it up. Just keep your eyes open and do Google searches often (lol!).
Okay, now on to your project.. I think AndyS has one of the cleanest conversions I've seen out here, with his voltage meter installed. That's a good template to start with for cleanliness and attention to detail. As far as expenses.. It's one thing to buy a bunch of parts, quite another to actually get the performance you want.
That little MX-350, with a 350-watt 24v motor being pushed to 48v ran faster than my MX-500 with a 500-watt 36v motor being pushed to 48v. Why?? Beacuse most of these permanent magnet motors are specified to run at 2500-2650 rpm at their rated voltages. When you increase the voltage applied to these motors, they run faster. I know, it sounds simple enough. But a 500-watt motor designed to turn at 2500 rpm, 24v will run faster than a 500-watt motor designed to turn at 2500 rpm, 36v when both are used in a 48v application. Granted, the 36v version will withstand more load at the higher voltage so there is a trade-off. If you stick with the stock gearing, you shouldn't notice any difference unless you really try to climb a mountain or run at heavy loads.
Take it in steps and you will appreciate the differences you apply. I would try to do the 48v controller/battery upgrade first. Ride it around for awhile and see how it feels. Then you can get an idea of what type of motor (if necessary) would suit your needs next.
If you're a crazy sicko (like me) then you can try to stuff some 4 HP monster in there with expensive LiFePo batteries. I'm gathering stuff for that project and will post more on it when I am done reading up on more things to do. The worst thing you could do is go out and buy a bunch of stuff without understanding how to install/or apply it. If you're lucky..you will wind up with a bike that runs part of the time but always requires you to work on it. Nobody likes that.
Not only will you triple the range of the bike, you loose about 20 pounds in the process. I also picked up some performance from the weight loss and also because the packs run a few volts higher than the Lead acid 4 battery set up. And do make fun of the duct tape!
I am running this on a modified lashout electric scooter with a 1000 watt brushless motor that can hit over 30 MPH and climb a 20% grade, and it has not cut out on me. My range went from 7 miles to 20, and I can ride most of that distance at full voltage power!
I have not tried to fit the pack to the MX500 yet, but it should go in there with a little fooling. It is only about 6X4X14 inches. Comes with it own smart charger. Delivery time from China was only about 1 week. Maximum continuous output is about 40 amps, with peak amps about 60, so anyone running a monster motor should check there amp draw with a meter before getting one.
I recently purchased 2 MX650's and I am turning them into 48 Volt systems! I already added the 1 extra 12 Volt battery to both of them and gained good immediate power but after driving both of them for a day or two, I think I ruined my stock 36 Volt control modules? Now they have almost no power even though all the batteries are fully charged! So I am planning on replacing them with the YK42-4 control modules! I was very excited to hear that I could buy the next size electric motor 750 Watt 36 Volt motor that will be a super easy bolt on with no cutting or drilling! BUT then I heard other people saying that they purchased this larger motor 750 Watt 36 Volt motor and it did not fit! The exact distance I need to fit the electric motor perfectly between my swingarm is 5 1/4". But I heard a few times in these different threads that the bigger 750 Watt 36 Volt motor is actually 5 1/2", that would be a 1/4" to large to fit in my MX 650! Now I am torn if I should take the risk buying the larger engines! Is there anybody that could tell me the exact deminsions of the larger electric motor 750 Watt 36 Volt???
Is there really that much of a power gain from the stock 650 Watt 36 Volt electric motor compared to the larger 750 Watt 36 Volt electric engine? Only 100 Watts more, is it worth the extra money???
How am I able to tell what is to hot for the electric motor to be running at? Is there a specific temperature to try to stay under??? Or is there a rule of thumb technique? I live in southern Florida so it is always very hot out!
Anybody that reads and responds to my questions I would really really much appreciate it!!!
the 750 watt motor will fit, but you have to swap the end plate with the one from the stock motor. When you do this, you have to play with the spring loaded brushes to get the thing back together again, which I personally found tricky. I don't think you will gain much going from the 650 to 750 watt motors. At 48 volts, the 650 basically becomes a 867 watt motor, and the 750, a 1000 watt. I hope you can get a good controller-the quality varies from unit to unit on the cheap ones available.
just switch the controller to a 48v/50amp and leave the motor only... to answer your question on when is too hot too hot,,, well easy you won't be able to keep your hand on it and the other thing is you will smell the coating frying... now back to the motor... tncscooter sells the 48v/50amp controller so just replace that and run the stock motor.. this way if you beat the hell out of it and you frie the stock one then you'll know what not to do with the new motor... but as mentioned you will have to swap out the end caps(if you do get the 750)... you need the blue motor not the black one, black motor has a different size end cap..... good luck.....
BTW: where in fl. you live??? i'm in tampa
I recently purchased 2 MX650's and I am turning them into 48 Volt systems! I already added the 1 extra 12 Volt battery to both of them and gained good immediate power but after driving both of them for a day or two, I think I ruined my stock 36 Volt control modules? Now they have almost no power even though all the batteries are fully charged! So I am planning on replacing them with the YK42-4 control modules! I was very excited to hear that I could buy the next size electric motor 750 Watt 36 Volt motor that will be a super easy bolt on with no cutting or drilling! BUT then I heard other people saying that they purchased this larger motor 750 Watt 36 Volt motor and it did not fit! The exact distance I need to fit the electric motor perfectly between my swingarm is 5 1/4". But I heard a few times in these different threads that the bigger 750 Watt 36 Volt motor is actually 5 1/2", that would be a 1/4" to large to fit in my MX 650! Now I am torn if I should take the risk buying the larger engines! Is there anybody that could tell me the exact deminsions of the larger electric motor 750 Watt 36 Volt???
Is there really that much of a power gain from the stock 650 Watt 36 Volt electric motor compared to the larger 750 Watt 36 Volt electric engine? Only 100 Watts more, is it worth the extra money???
How am I able to tell what is to hot for the electric motor to be running at? Is there a specific temperature to try to stay under??? Or is there a rule of thumb technique? I live in southern Florida so it is always very hot out!
Anybody that reads and responds to my questions I would really really much appreciate it!!!
Thanks for your time,
Travis
Travis,
aproldan is right, go with the TNC 50a/48v controller instead of the 100a one. The 100anp one will cause engine stumble, i.e. – “tah, tah, tah” when you go full throttle. This is because the 100a controller pulls more amps from the stock batteries, than they can deliver. The 750w blue motor will fit, once you change the cap. *The cap without the shaft(the one where the wire leeds go in)have the spring loaded brushes. You will have to move the spring clips back, and set them on the rear of the brushes case, so they won’t push the brushes into the motor shaft when you reinstall the cap. Install the cap all the way, except about 1/8 on an inch. Then, using a tiny flat screwdriver, reach in and flick each spring back onto the rear of each brush. This will make the brushes seat to the motor shaft. Hot: I don’t think you will have too much of a problem with the 750w motor getting too hot, as long as you are riding on mainly flat surfaces. Those motors usually only melt when you gun the throttle all the time, or ride hills with the throttle pegged.
You will have to move the spring clips back, and set them on the rear of the brushes case, so they won’t push the brushes into the motor shaft when you reinstall the cap. Install the cap all the way, except about 1/8 on an inch. Then, using a tiny flat screwdriver, reach in and flick each spring back onto the rear of each brush. This will make the brushes seat to the motor shaft.
-miker71
follow mikes instruction... but to make it easier when you pull the spring back it will stay on the brush casing(barely but will sit on it) then once you put the cap on (til it completely closes) give it a good smack, just like you see the doctors do to a new born baby bottom... once you do that the springs fall right back into place then just bolt the screws down... remember to mark your cap and motor body so you know where your timing was set at.....but i would just run the 650 til it dies since it is still a brand new motor... no sense in wasting good money .....
First off I really wanted to thank everyone for your responses, tips and suggestions!!! Greatly appreciated!!!
I ended up ordering 2 48 Volt YK42-4's for both of my new MX650's and received them today 4/4/2008 with the 48 Volt chargers! I hooked up the wiring for my new 48 Volt control modules and got to the last part hooking up the twist throttle. I tried very hard how to figure out how to connect my stock 5 wire twist throttle to my new control module that only had 3 wires, very confusing and frustrating when it doesn't give you a clear diagram of how to do it!!! The new 48 volt control module has 3 wires for the twist throttle colors red, black and green. My stock twist throttle on my MX 650's have five wires colors red, orange, green and 2 black wires! I tried and tried so hard moving the wires around to make the new control module and my stock twist throttle to work and I think I ended up ruining my brand new control module!!!!! If anyone has any idea on how I can connect the 3 wires off my new control module to my stock 5 wire twist throttle and make it work propperly I would love to give you a hug because now I am down in the dumps with two new bikes, new 48 volt control modules , 48 volt chargers and the extra batteries and all the time I have spent and I still can't drive either of them!!!!! Now I will probably have to order another module and start all the wiring over again for a second try! Please Help! I will have to have it spelled out to me like you would to a pre schooler so I don't mess it up again!
Do you think My YK42-4 Modules are to strong for my stock 36 volt 650 watt motor with my 48 volt battery setup???
If I did purchase that upgraded 36 volt 750 watt motor, does it come with a sprocket already attached to it? And if it does, am I able to use it on my bike without having to change it? would it work with my stock chain and with my stock rear sprocket too?
Sorry for all the questions, I just do everything my self and I make a lot of costly mistakes! So all of your help is very very appreciated!!!
You were saying that the 48 volt 100A controller would make my 48 volt motor stumble at full throttle on my MX 650's even though my battery setup is 48 volts? I'm sorry but I just received 2 of 48 volt 100A controllers today! Do you think If I added another battery to my already 48 volt system and still kept it 48 volts just to make a larger battery capacity would help? Or do you have any suggestions now that I have already purchased 2 of them where I would be able to still use them but not make my motor stumble at full throttle? Any ways I can utilize my already purchased control modules without having any problems?
Was wondering if anyone new if they make 48 volt electric motors that would be able to fit into my two MX 650's? Any website? Or price range?
I was also wondering where I would be able to get two longer rear shocks for my MX 650's so I can raise the ride height on my bikes? I would ideally like the after market shocks to be about two inches longer but be able to bolt right in without any cutting, welding and drilling. A lot of mountain bikes are the exact same length not any longer.
Was wondering if anyone new if they make 48 volt electric motors that would be able to fit into my two MX 650's? Any website? Or price range?
I was also wondering where I would be able to get two longer rear shocks for my MX 650's so I can raise the ride height on my bikes? I would ideally like the after market shocks to be about two inches longer but be able to bolt right in without any cutting, welding and drilling. A lot of mountain bikes are the exact same length not any longer.
