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Re: MX650 mods?

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Originally Posted by killaj View Post

Ok, I must ask Aproldan for advice now.. I wanna make the 30mph club. Any advice on what to change next to get there?
if your bike is for the road advance the timing just an 1/8 to a 1/4 " you'll hit 30mph BTW you need to get your speed on vid and post on here or youtube.... another way is down the rear sprocket to 65tooth (if it's already 65 then drop to a 55tooth) but then you need to shorten the chain so it may not be worth it if you only went to make a couple runs @ 30.....good luck and happy new year

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Re: MX650 mods?

We fooled with the timing today on a friend's scooter. It added a few MPH on the top end by advancing it about 1/4 inch. We had to re-drill a couple of mounting holes on the left side bracket, however,as they did not line up anymore after the adjustment.

I installed the RST rear shock and posted a few photos. It raised the back end up 2 inches, (its a 2 to 1 ratio, so a inch longer shock raises the back end up 2 inches) . This mountain bike shock is a a real shock with adjustable dampening. The stock "shock" had no dampening what so ever-zero. I ended up transferring the spring from the stock shock to the RST, as its spring was a bit too stiff. The ride is much nicer in the back now, and the bike sits better with the added seat height. Now I need to see about the front fork springs.
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Re: MX650 mods?

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Originally Posted by andyS View Post
We had to re-drill a couple of mounting holes on the left side bracket, however,as they did not line up anymore after the adjustment.
what you needed to do was rotate the main body of the motor not the end cap so there would have been no need to redrill new holes... oh never mind your using a different motor i see..... not stock.....

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Last edited by aproldan; 01-01-2008 at 01:11 AM.
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Re: MX650 mods?

Aproldan: you're right about this motor as well..referring to adjusting the timing on it. You would normally have to redrill new mounting holes if you rotate the end cap by itself. I marked the motor end cap, center case and front cap with a silver Sharpie marker as a start reference. When I advanced the timing, I took the motor apart and rotated the center section then re-installed the caps to it. You only have certain spaces between the magnets to use for the screws that hold the end cap. But it works without having to change how you mount the motor if you play around with it.

All that said, I barely gained a mph when I advanced the timing. So I'm still "putting along" at a measly 29mph after quite a bit of runway. The motor was much warmer this time around too.. I think I'm going to put the timing back to stock or even max torque, go back to the 11-tooth sprocket and run at 48v for an overall fun and reliable bike that should last for awhile.

As for the speed stuff, I'm going to look for a new project and start fresh. I'd like to use a frame from a mid-size gas bike and some serious power for a sure-fire 35+ mph all day if I wanted it. Part of the fun is goofing around with modifications. Once you learn from the experience, the performance envelope can be pushed further with more research.

Aproldan, again I seek your wisdom. Are there any 2000w motors out there of decent size that would be suitable for such a project? I know brushless motors are expensive, but have you found any that seem relatively close to being reasonable or is Etek the final answer when it comes to big HP electric stuff?
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Re: MX650 mods?

Quote:
Originally Posted by killaj View Post
I think I'm going to put the timing back to stock or even max torque, go back to the 11-tooth sprocket
Are there any 2000w motors out there of decent size that would be suitable for such a project? I know brushless motors are expensive, but have you found any that seem relatively close to being reasonable or is Etek the final answer when it comes to big HP electric stuff?
first you say your going back to 11 tooth sprocket.... what do you have on there right now....i thought you were using the stock sprockets....
as for motors there are plenty of 2000watt motors out there but the problem is not too many folks are willing to put out the kind of money they want you to pay for it.... but i think if you want to start from scratch etek may be the way to go... it's reliable strong and the price isn't bad for as many hp it can produce...

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Re: MX650 mods?

Sorry, reading back I realized that I've posted my setup in another thread. I'm currently using a 14-tooth sprocket. I wanted to see how fast I could go with the 900watt motor. I think I've found out. As well, I'd like something that goes fast (~35mph) all the time with no threat of over-heating or damaging any components.

The Etek motors are pretty nice. They have a pretty slick design with the brushes going parallel to the armature. The only drawback is that they are no longer produced and as well, they go through brushes pretty often (for daily continuous use in golf carts, apparently). As well.. in principle it's still a brushed motor and will have a lower overall efficiency than a brusless motor.

I saw this on Ebay, http://cgi.ebay.com/Mars-brushless-d...QQcmdZViewItem

For overall value, it seems comparable to the Etek. It all depends on the cost of a controller for it. Also, batteries are the next issue.. I know there has to be batteries with more output per lb. out there and also capable of higher discharge rates. Any suggestions there? I still have to search for a frame to put all this in as well, but at this stage (conceptual) it's fun to find out whats possible.
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Re: MX650 mods?

Hmm.. I think I just found my dream..

http://www.thunderstruck-ev.com/roadrunner.htm

Wow! I suppose a lot of research and fiddeling around has been done by the enginers at this company and they seem to lead towards the Etek motor as opposed to a brushless set-up. I have work to do..
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Re: MX650 mods?

That bike looks killer!

I'm curious about the MARS brushless as well. I would love to find someone who has run a MARS and ETEK and compare the performance.

I saw the SEVCON controller was around $400. I *think* I saw on one of the EV sites that you can get a complete MARS set up for a bike (motor, controller, twist throttle, connectors, cable, etc.) for $1100.
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Re: MX650 mods?

i watched a seminar on that motor and the controller... very impressive that motor... it can handle 100amp for 1 hour straight( not just for a few minutes)and they said the power is the same or better then the brush version with better efficiency... the sevcon is made for it (the best matchup for that motor) with regen braking... this all came from the guy who created the original etek motor... i had found that vid on youtube a while back.. kind of boring but informative....

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Re: MX650 mods?

Talk about expensive.. yikes!!

Speaking of the guy who created the original motor, here's some good reading on a project that was done to upgrade a lawnmower using the Etek motor. http://209.85.207.104/search?q=cache...lnk&cd=1&gl=us
Lots of good research done with regards to other motors for comparison and as well, some funny stuff. These guys were slamming the Etek motor with 48v, 21ah of juice with no controller!! I think I recall something to the effect of "...the front wheels of the mower jump in the air and to the right when power is applied.." Now that's what I call grass cuttin'!

As well, I found this website which was referenced off the above-mentioned research project http://www.robotmarketplace.com/store.html

Here they sell PERM motors. This one PMG 080(http://www.robotmarketplace.com/mark...tors_perm.html) seems somewhat reasonible to use for a nice ride that would do 35 mph all day with some decent torque. I think 3.95 HP @ 24v 6880 rpm is pretty awesome for a motor 5.9" in diameter and 3.5" long. $500 however, is not so awesome.

At least the motor would fit in the MX500 frame with little hassle. Furthermore, I think 2-12v 21ah batteries would fit (one on each tray) for some decent punch and runtime.
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Re: MX650 mods?

here are a couple motors I am thinking about, decent power, correct rpm and size and resonable price, the pmg 080 has such high rpm it would require a jackshaft to gear it down.
http://www.robotmarketplace.com/mark...otors_npc.html
http://www.robotmarketplace.com/mark...magmotors.html
and reasonable prices on high discharge batteries here
http://www.robotmarketplace.com/mark...batteries.html

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Re: MX650 mods?

BTW , its the NPC Black max that looks the best for my application.
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Re: MX650 mods?

Hmm.. I guess you're right about the PMG 080 Denise. I'd definitely have to regear to allow for 6k motor madness! That Black Max motor looks like a good candidate. I've been reading through almost every post on here and found where other's have thought about using it or where Aproldan used it to make a 47 mph go-cart, sweet!!

Also, when I look and the dates of some of these posts.. gosh, I feel like I'm so late to the party! And under-dressed for that matter! To think I was goofing around in Toys-R-Us about a year ago, looking to buy my neice and nephew some gifts when I started all this.

Ok, back to the task at hand.. Anyone know a good source for LiFePo battries?
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Re: MX650 mods?

where can i find an 8t sprocket for the 750w motor that is mentioned in this thread? i googled and checked tnc to no avail.
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Re: MX650 mods?

Hi, I'am try'ing to find two 750w motor's 36v or higher wattage with out having to fab my swingarm and the motor's that you guy's have mentioned are 5 1/2" and both of my mx500's motor's are 5 1/4". The other question I had is the 9t sprocket you spoke about from surplus is it this part # 1-2742-9-A ?
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Re: MX650 mods?

Does anyone know if I can put an 18 tooth Bore Sprocket for a #25 on a MX650 without modding?
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Re: MX650 mods?

Speed Demon,

I think your question of fitting an 18-tooth pinion without modifications actually warants more questions..

I am using a larger 900-watt motor (longer, but same diameter) with a 14-tooth sprocket. I had to remove the chain tensioner in order to use the stock #25 chain (which is barely long enough).

I don't think you can simply use a sprocket larger than say.. a 15-tooth. Anything larger would require you to change the motor mounting position or purchase a longer chain (or more links to add to your chain). Either way, I think that qualifies as a "modification".

Are you planning on using the stock motor and controller? If so, I do not think that it will have enough power to pull the bike without damaging the motor and/or controller.

I am assuming that you are planning on doing this to a MX-500/600, if I am wrong please give more info about your project.
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Re: MX650 mods?

I just got an awesome 48 volt 20 AH LIFEPO4 pack from ebay seller Ping Battery. I run it on a Lashout scooter with a 1000 watt Powepack brushless motor that does 30 MPH. The range went from 7 miles with lead acid batteries to 20,(not a misprint) and the power available is at full force for almost all of it the range. The pack is about 6X4X14 inches, but can be configured to fit your space needs. Weight is under 20 pounds. This transformed my Scooter from a fun neighborhood ride to a more serious means of transportation. Cost is about 50% what any other batteries of this quality were going for. I got it in about 1 week after purchasing it.

http://stores.ebay.com/PingBattery_W...Q3amesstQQtZkm
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Re: MX650 mods?

About motor options, I bet it wouldn't be too hard to fit the Currie style right hand side motors on the MX series bikes without having to hack up the frames. There is even a kit available to run twin motors. The 600 watt brushed Currie motor in the link delivers over 1000 watts when run with a 36 volt 40 amp controller.

http://www.cloudelectric.com/inc/sdetail/214

I run this powerpack motors set up on my Lashout, and it is very powerful

http://powerpackmotors.com/POWERPACK...photopage.html
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Thumbs up Re: MX650 mods?

Kill,

I am using an MX650

I am planning on using a 750 watt motor (unless I can find a 900 watt motor, which seems impossible)...

I am also getting a 50-100 amp controller off of tncscooters.com

And another battery

and if it's easy, the other front sprocket to make it go that much faster

also, changing the timing on the motor (if that is possible)

I don't know if all those parts will cooperate together, this being my first mod and I am going to need some help along the way

It would be great if you could give me an input, that would be great!
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