MX650 mods? - Page 3 - Pocket Bike Forum - Mini Bikes
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Re: MX650 mods?

miker71, thank you for your help in this post. I now have a 20mph(uphill) / 23mph(downhill) mx650.

I am running the set up you suggested in this thread.
My mods are: 48V, YK42-4 controller, 3 wire throttle, automotive fusable link with 50amp fuse, 12 gauge wire, a 10t front sprocket ( that I modified to fit) from surpluscenter, 60 amp toggle switch, 48V charger, charger receptacle port, and modified stock battery cover.

I was able to do most of the mods myself based off this thread. Thanks again.
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Re: MX650 mods?

Quote:
Originally Posted by miker71 View Post
Jesse,

For Speed, see answers to sprocket change questions:
https://www.pocketbikeplanet.com/118-...00-please.html

-miker71

Jesse,

I'm not sure what happened to this link(post#39) when I posted it, but it seems one cannot click on it to go directly to it..

*So, if anyone wants to check out discussions about MX sprocket changes for speed/torque, just scroll through the forum list, and look for the one called "question about mx500... please answer".
*Read the posts for info.


-miker71
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Re: MX650 mods?

Quote:
Originally Posted by tera View Post
miker71, thank you for your help in this post. I now have a 20mph(uphill) / 23mph(downhill) mx650.

I am running the set up you suggested in this thread.
My mods are: 48V, YK42-4 controller, 3 wire throttle, automotive fusable link with 50amp fuse, 12 gauge wire, a 10t front sprocket ( that I modified to fit) from surpluscenter, 60 amp toggle switch, 48V charger, charger receptacle port, and modified stock battery cover.

I was able to do most of the mods myself based off this thread. Thanks again.
Tera,

That's Great! Glad to have been of assistance, you are every welcome!
How about uploading a picture to your "aviator" picture profile, so that everyone can see your mx650 when they read you posts?

-miker71
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Re: MX650 mods?

Quote:
Originally Posted by trueawoodstar1
thanks for your help but i was wondering where to buy the 50 amp fuse and the 12 gauge wire?

trueawoodstar1,

For the fuse, I used a "fusible-link".
For the 12 Gauge wire, I used automotive wire.
*You should be able to get these at any automotive parts store.

Cheers,
-miker71
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Re: MX650 mods?

thanks, would 10 or 14 gauge wire work?
and i put together my mx500 about a week ago and after taking off the battery cover am pretty confused..
so first of all, the 48 volt system would with the 500 watt motor right?
and before i buy all the mod stuff, is it difficult to do the entire set-up?
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Re: MX650 mods?

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Originally Posted by trueawoodstar1 View Post
thanks, would 10 or 14 gauge wire work?
and i put together my mx500 about a week ago and after taking off the battery cover am pretty confused..
so first of all, the 48 volt system would with the 500 watt motor right?
and before i buy all the mod stuff, is it difficult to do the entire set-up?

trueawoodstar,

*The first MX500 I upgraded, I used 10g and it was a bear to work with. When I upgraded my son's friends MX500, we used 12g and it was much easier to work with. I haven't had any problems with the 12g wire. The motor wires are 12g, so I figured it would be ok.

*The 48v system will work with the 500w motor. But, because the motor is less powerful to start with, you will see less gain at 48v. Plus, the 500w motor will get hot faster than a 750w or 1200w motor.

*Although the upgrade to 48w is not all that difficult, it is not for the light hearted either. It takes time and commitment to see it through. All the info you need to do the upgrade is basically already in this post, but you do have to have a basic understanding of electronics to hook it up.

*The easiest upgrade for most is the 48v/750w motor combination. To go to the 1200w motor, involves modification of the rear swing arm.

-miker71
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Re: MX650 mods?

Thanks for the help, but im planning on riding it on hard flat surfaces would the 48 volt go 24 mph with the stock gears and would the new charger plug right in to the old charger port?
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Re: MX650 mods?

If you're planning on hard, flat surfaces and want to achieve 24 MPH, I have a motor for sale in the classified section that will get you there without any other changes. You can maintain your stock controller, charger, batteries, etc., etc. I ran the motor a couple times in my MX500 but for my weight (185) it lacked low end torque for off-road riding. On a paved surface the bike was clocked at 24 MPH with a GPS unit. It moves out.

Anyway, if you're interested email me at jpayer37 AT gmail.com. I'm asking $35 for the motor - shipping included.

See the ad here:

https://www.pocketbikeplanet.com/169-...-24v-500w.html
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Re: MX650 mods?

Hi Mike, first,Thank You for your patience and dedication to helping others, I learned alot reading this thread and it has helped with my project which is a mongoose CX450 modified with a high end mountainbike front end and rear shock for real hydrolic suspension and hydrolic front disc brake, this is more of an adult sized bike, ( i'll put up some pics later) I am now in the procces of upgrading the motor, controller and drive sytem ,I would like to know if the 90 t currie sprocket is for 25H chain?
Denise
http://hometown.aol.com/denisesewa/DenisesPage.html
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Re: MX650 mods?

Well I found the answer and ordered the sprocket, Thanks anyway.
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Re: MX650 mods?

so, do you really need the new 48v controller or can you just add the exta batt??
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Re: MX650 mods?

you can run 48volts into the stock controller but the voltage shut off will be overridden with the higher voltage,*you may fry your cells from over discharge*
But if you pay attention to the feel of the bike and get it back on charge when she feels lumpy with power.....

!!!!!you will need a 48volt charger!!!!!
 
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Re: MX650 mods?

http://cgi.ebay.com/BRAND-NEW-900-WA...QQcmdZViewItem


this is a great motor to use in the Razor MX500. Same size as the 750 watt TNC sells, (5 1/2 inch long with same mounting system holes) so you do not have to cut and weld, but rated at 900 watt 36 volts. We use one on a scooter with 48 volts , and it puts out over 1600 watt peaks. My 250 pound friend goes over 20 MPH with that motor. It is also tunable-you can advance the timing for more top end, or retard it to get more torque.

See this article on tuning-same set up as the 800 watt the older rad2go came with.

http://www.sdscooters.com/SDSTuneElecTimingAdv.html

The only issue is it comes with an 8mm chain size sprocket and has an over-sized dual D bore on the shaft. To run it on a 25mm chain system, you need to get the 10mm dual D bore sprocket 11 tooth from TNC, and file it out to fit on the motor shaft.

I have an MX 500 coming for my son (and me !) that I am going to run 48 volt with this motor. I'll post some images later when I get the scooter and convert it.
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Re: MX650 mods?

well, got my MX500, and as I posted on another thread, for some reason my bike has a super tight tolerance on the motor length, and even the 5 1/2 inch 750 watt motor recommended does not fit by 1/4 inch. My 900 is also long about 1/4 inch as well. I wonder if the MX650 original motor is 1/4 longer than the one that comes in the MX500. Can anyone confirm that the 650 Watt motor is 5 1/2 inches long and not 5 1/4 like the 500 watt? If this is the case, there is a reason to spend a few more bucks on the MX650 besides the yellow paint.

I went ahead and notched the frame about 1/2 inch and moved the left side bracket outward 3/8 inch or so. (not as radical as trying to fit the 6 inch long 1200 watt motor) Welded a reinforcement brace-it will be plenty strong. Thing should fly with the 800 -900 watt Rad2go motor in there, especially run a 48 volts where it becomes a high speed 1200 watt.

Also, I could not fit the extra battery as recommended in this thread either. The combined width of both 12ah batteries side to side was about 3/8 inch too long to fit between the frame members, with the old tray tabs bent all the way down. I figured out a way to fit it, but it meant the front battery is about 2 inches above the original box. I put a block of wood under it to support it, and had to trim the side housing to get it back together.

When I finish it up later this week, I'll try to post a few photos.

Andy
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Re: MX650 mods?

FYI,

There's a 24v 500w motor on ebay for $30 plus shipping ($12.85).. Supposed to be some sort of scratch-n-dent.

http://cgi.ebay.com/24VDC-500-Watt-E...QQcmdZViewItem
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Re: MX650 mods?

A quick update for my project..

I ended up doing the rear swing arm modification myself and installing the 900watt motor. I wanted to have someone weld the arm for me, since I have no welding experience but finding someone during the holiday season proved to be difficult.

I became impatient and after looking at the bike and then the motor for awhile, I decided to have a go! I cut the frame with a Dremel tool and then used some aluminum angle stock from Home Depot to serve as a support brace/mounting bracket. Rather than weld it, I drilled through the swing arm and bolted the angle bracket down to it.

It works pretty good! I will have to redo the bracket (not a problem since I purchased a 4ft section of it for $11) because the motor is not 100% parallel with the rear wheel axle. But that's a cosmetic fix as the bike is fully functional.. at 60v!! I am still using the YK42-4 (older version) with 5 12v 12ah batteries tucked away in there. As well, I am using a 14-tooth sprocket on the motor for more top speed.

After four runs over the weekend (all until the batteries seemed to loose juice), there are no heat issues on either the controller or the motor. The original 36v 500w motor that came with the bike would get very warm after half the run time at 60v. I ended up taking that motor apart and there were definite signs of carbon burning on the armature. **Note for anyone else out there crazy enough to try this: as andyS suggested, the 36v 500w motor will not hold up to 60v operation for very long.** At least not with my 200 lb. can on the bike

As for top speed, I'm not sure but it's pretty fast. I hear the wind whoosh past me as I ride now, where before I heard the motor and noisy chain tensioner over most anything else. I think it does over 30 mph, but I would like to confirm this before saying so. I had to remove the chain tensioner to use the larger 14-tooth sprocket, so I don't hear that any more. I LOVE the bike! It still has plenty of torque as well, the next thing I'm going to do is try to adjust the motor timing as Aproldan suggested. Actually, I did adjust it before I installed the motor in the bike with the motor clamped down on a bench vise while running a single 12v battery. There is indeed a large contrast in speed and torque when turned in either direction. For starters, I left it in the original configuration to see what the motor "felt" like.

Overall, this project took me about 6 hours to complete. Not too bad for a bike that no longer feels like a toy. As well, once confirmed I would like entry into the 30+ mph club please!

Last edited by killaj; 12-30-2007 at 11:39 PM.
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Re: MX650 mods?

that motor is a good one. I believe it is actually the same as the 800 watt motor that was used in the Rad2go White shark scooter-one of the most powerful stock motors ever put on a cheap scooter. What controller did you end up running-the 60 volt Xtreme??

My son loves his bike with the same motor and 48 volt set up and stock gearing. he can take off very quickly, goes 25 on the straight, 20 up fairly steep hills, and tears it up in the dirt. What amazes me is he can also go way over 10 miles on a charge at full power. The motor doesn't even get warm with him riding it. I have had to hop up my ride a bit more so I can still hang with him!! I just put a 48V 12AH LiFePO4 battery in my ride. Man, those things pack a wallop for their size and weight. 25 pounds lighter than 4 12V 12AH Lead acid batteries.
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Re: MX650 mods?

I just re-read your post and saw you were using the TNC 48 volt controller. I am also tempted to shorten the chain a bit and remove the noisy tensioner.

I am thinking of trying to install a slightly longer rear shock to get the seat a couple of inches higher and soften the ride a bit in the rear. A 7 inch eye to eye shock is 1 inch longer than stock, and will raise the back end up a few inches. I just found a nice mountain bike shock with a rebound adjuster in that size by RST.

Has anyone played with a longer pit bike front fork to jack the front end up a few inches? The front fork is a bit soft on our bike, and will bottom out, especially when I ride it. I also wondered if you can change the springs, and how you would do that. I saw various springs for sale at the pit bike sites, but have no idea on how to do it.
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Re: MX650 mods?

andyS: My Extreme 60v controller hasn't arrived yet. Neither has my newer model YK42-4 from TNC scooters that was to be replaced beacuse it was basically D.O.A. When they do arrive, I'll run the MX500 with the 60v controller, put the older and seemingly more robust YK42-4 controller in the MX350 and then run the newer model YK42-4 controller on the PR200. I've already started to put the 500w motor on that little guy. It should be a blast because i plan to run a 16-tooth sprocket on the motor!!

Let me know how the suspension upgrades go. I only ride on flat suraces for the most part, but I'm curious to see how it turns out. Regarding the removal of the tensioner, I think you'll find that you have to find the length you want and then put the chain over both sprockets with the motor unbolted (but supported from underneath). That way you can slide the motor forward and then bolt it down. Since I mounted it on an angle bracket that I later attached to the swing arm, I was able to move it back and forth until I found the desired tension and then bolt it down.

Last edited by killaj; 12-31-2007 at 11:20 AM.
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Re: MX650 mods?

Just purchased a radar gun from Bushnell and had my neighbor test me as I whooshed by.. 28mph! Darn it! I'm so close!!

I've been fooling around with the radar gun for a few hours and checked it versus both my cars and my neighbors vehicle as we dorve down our quiet little street. Seems pretty accurate when compared to the speedometer in each vehicle. As well, my GPS also measures velocity and I used it to compare and got 27mph.

Ok, I must ask Aproldan for advice now.. I wanna make the 30mph club. Any advice on what to change next to get there?
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