Mongoose/ Dyno CX24 200 Build

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EbikeAus   100 W

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Mongoose/ Dyno CX24 200 Build

Post by EbikeAus » Jul 06 2018 6:53am

Hey all,

I've been itching for a new build for some time and saw one of the Mongoose CX 24 200 come up for sale.
It seems that here in Australia they were rebranded as Dyno 24 200, although it appears to have the same frame as the CX 24 450 in the U.S. with rear suspension.

Will post pics soon.
The original tyres having plenty of tread, tells me it hasn't done a lot of work and is in good condition overall.

Being 5' 10 it is definitely a bit small in it's current state..but will most likely copy the other great looking builds like the recent small block build and add some decent forks and 24" front tyre, maybe a different seat and some bmx bars.

First up I'd like to try a 10s 36v 18650 pack on it. Do you guys think I will fry the motor straight away, will it even run, or should I upgrade the controller before even attempting it?

Thanks in advance :)
Last edited by EbikeAus on Aug 03 2018 10:00pm, edited 2 times in total.
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Hillhater   100 GW

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Re: Another Mongoose CX Build

Post by Hillhater » Jul 06 2018 9:13pm

Every 24v bike i have tried , has run no problems, and much better, on a 36v pack .
..( try one on those Aprilias you have too !)
This forum owes its existence to Justin of ebikes.ca

EbikeAus   100 W

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Re: Another Mongoose CX Build

Post by EbikeAus » Jul 07 2018 6:46am

Hillhater wrote:
Jul 06 2018 9:13pm
Every 24v bike i have tried , has run no problems, and much better, on a 36v pack .
..( try one on those Aprilias you have too !)
I'll give it a go. Pulled the battery case out today, looks like the 10s pack will fit in nicely.
Thanks
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EbikeAus   100 W

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Re: Another Mongoose CX Build

Post by EbikeAus » Jul 07 2018 8:46pm

Has anyone tried one of these kits?

https://rover.ebay.com/rover/0/0/0?mpre ... 2519100496

Or this one

https://rover.ebay.com/rover/0/0/0?mpre ... 2614876431

In particular the motor.
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EbikeAus   100 W

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Re: Another Mongoose CX Build

Post by EbikeAus » Jul 08 2018 4:41am

Here are some pics of how the 10s pack will fit. The only mod need is to grind down a little off the plastic reinforcements inside the box to allow the pack to fit snugly but not rub on anything hard.

Image

The pack is made of recycled Sony VTC6 cells 10s 4p.

Image

In the next pic you will see there are 2 x POS and 2 x NEG leads as there were 2 x SLA batts in the standard configuration for 24 volt.

Image
Last edited by EbikeAus on Jul 09 2018 5:31am, edited 1 time in total.
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EbikeAus   100 W

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Re: Another Mongoose CX Build

Post by EbikeAus » Jul 09 2018 2:54am

It appears the controller is limiting/ not allowing 36 volts :?

Looks like I'll have to either make a 24v lithium pack or upgrade to 36v controller.

Any advice welcome
Last edited by EbikeAus on Jul 26 2018 4:02am, edited 3 times in total.
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EbikeAus   100 W

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Re: Another Mongoose CX Build

Post by EbikeAus » Jul 09 2018 5:36am

Got it sorted
Last edited by EbikeAus on Jul 26 2018 4:01am, edited 2 times in total.
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Hillhater   100 GW

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Re: Another Mongoose CX Build

Post by Hillhater » Jul 09 2018 6:27am

Hmm, im not sure how exactly that wiring is connected but..
Can you connect the 10s pack direct to the controler input leads to eliminate all those other connections and switches,.
Also check that the bms in the 10s pack is not cutting the power when connected for some reason..
This forum owes its existence to Justin of ebikes.ca

EbikeAus   100 W

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Re: Another Mongoose CX Build

Post by EbikeAus » Jul 10 2018 2:58am

Hillhater wrote:
Jul 09 2018 6:27am
Hmm, im not sure how exactly that wiring is connected but..
Can you connect the 10s pack direct to the controler input leads to eliminate all those other connections and switches,.
Also check that the bms in the 10s pack is not cutting the power when connected for some reason..
Yes..I was clearly overthinking it :roll:
I ended up connecting the 10s directly to the controller via a 20 amp blade fuse and the on off switch on the battery box.
It's actually a decent setup the battery box, I reckon I can get 14s 4p in there when I settle on a new motor for it.

The motor does ok on 36 volt but that whining noise it makes would get old pretty quick, as would the hard little seat.
I'll probably get the seat reupholstered with more height and some more foam, or pick up a YZ125 seat as others have done.

I'm definitely getting new forks, front wheel and rear shock as the first few additions.

All in all I can see why others have tinkered with these, they seem like a solid little platform :D
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EbikeAus   100 W

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Re: Another Mongoose CX Build

Post by EbikeAus » Jul 20 2018 12:59am

I've ordered a set of these forks

ZOOM 620 DH 20" 24" 26" Disc Brake and V Brake DH Downhill Shoulders Mountain Bike Suspension Fork Travel 100mm
http://s.aliexpress.com/IzaYjYVz?fromSns=Copy

I'm not expecting anything amazing but should be a massive improvement on the dinky kids toy forks that are on there now.
I'm trying to keep this as a budget build for now.

I will add a 24" front wheel and improve front disc, thinking i'll stick with mech disc for now.

I plan to get a dirtbike seat, or reupholster the xisting to give more height and a bit of cushioning, the original feels like it's made from hardwood :roll:

36 volt lithium is a great upgrade so far, been enjoying riding with the kids. Apparently I'm the coolest Dad in the neighborhood :lol:
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BoisclairStainless   1 mW

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Re: Another Mongoose CX Build

Post by BoisclairStainless » Jul 20 2018 2:02am

Those Zoom forks look pretty good for the price. What's the total to your door?

EbikeAus   100 W

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Re: Another Mongoose CX Build

Post by EbikeAus » Jul 20 2018 4:50am

BoisclairStainless wrote:
Jul 20 2018 2:02am
Those Zoom forks look pretty good for the price. What's the total to your door?
I'm hoping they'll be ok.
$180 AUD to my door
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Hillhater   100 GW

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Re: Another Mongoose CX Build

Post by Hillhater » Jul 25 2018 5:16am

Have you tried riding it yet ?
That is way overgeared..
You need a much much bigger sprocket on the wheel hub.
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BoisclairStainless   1 mW

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Re: Another Mongoose CX Build

Post by BoisclairStainless » Jul 25 2018 9:05am

Yes, It rides great. I just take it slow on take off. Once it's up to 10-15mph, it speeds up to 30+ fantastic. I dont have a speedometer and haven't pinned it on a straightaway yet so Im not sure of top speed. I have a bigger sprocket for it but until I get a new rim and hub, this will have to do.

EbikeAus   100 W

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Re: Another Mongoose CX Build

Post by EbikeAus » Jul 25 2018 7:01pm

BoisclairStainless wrote:
Jul 25 2018 9:05am
Yes, It rides great. I just take it slow on take off. Once it's up to 10-15mph, it speeds up to 30+ fantastic. I dont have a speedometer and haven't pinned it on a straightaway yet so Im not sure of top speed. I have a bigger sprocket for it but until I get a new rim and hub, this will have to do.
Looks like it should go well 😃
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EbikeAus   100 W

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Re: Another Mongoose CX Build

Post by EbikeAus » Jul 25 2018 7:10pm

I decided to go next level with this build, at least for the drive train.

After seeing Raisedeyebrows build, I've ordered a small block and (mongoose conversion kit, my name for it) from Mike at Lightningrods :D

I plan to keep most other components to a smaller budget at this stage.

I have a couple of 14s5p battery packs I'm putting together.
One is Samsung 25R, the other LG HE2.

Thinking I'll limit current to 30 amps initially.

Any suggestions on a 12 fet 30 amp controller are welcome?

Thanks
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EbikeAus   100 W

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Re: Another Mongoose CX Build

Post by EbikeAus » Aug 02 2018 11:44pm

My Zoom forks arrived, have to say I'm happy :D Probably wouldn't single track or jump with them but for my use they are good.

Bike as it was when I bought it. As you can see from first and last photo the geometry has already improved with new forks :)

Image

New forks

Image

Image

Image

Image
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EbikeAus   100 W

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Re: Mongoose/ Dyno CX24 200 Build

Post by EbikeAus » Aug 07 2018 6:40am

Just ordered a 12 fet Lyen controller and cycle analyst to go with the small block motor.. :D
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EbikeAus   100 W

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Re: Mongoose/ Dyno CX24 200 Build

Post by EbikeAus » Sep 10 2018 4:02am

Hey guys

I bought a 2nd hand YZ125 seat, the original seat had to go, it was very hard and narrow.

So after some mods to the YZ seat it's sitting pretty good. Heaps more comfortable and gives another well needed inch or two height from the pedals...not that a lot of pedaling is planned for this little rocket, well maybe some faux pedaling 8)
I'll post a pic when it's completed with the cover back on :D

Image

Image

Image

Image

Image
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EbikeAus   100 W

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Re: Mongoose/ Dyno CX24 200 Build

Post by EbikeAus » Sep 11 2018 2:42am

skeetab5780 wrote:
Sep 10 2018 8:27am
Seat looks good! Nice work
Thanks mate!
It's definitely best mod I've done on this build so far
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Raisedeyebrows   1 kW

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Re: Mongoose/ Dyno CX24 200 Build

Post by Raisedeyebrows » Sep 12 2018 2:17pm

Seat looks like it's a great improvement, I'll be looking for something similar for mine. The forks you got look much sturdier that the originals too. I'll be watching to see your reaction once you get the motor installed and are riding it, my guess is you are going to get a big grin on your face. I have been riding mine a lot, with the new motor on there please do invest in a good full face helmet if you don't already have one.
Yuba Mundo w/BBSHD
Specialized Hard Rock w/9c clone, statoraid, hubsink
Trek Fuel 90 w/BBSHD
Above all run on 14s4p 52v li-ion
Ecobike folder 36v
Currie Flyer scooter 24v on 24ah of SLA

Every trip made with electric bike is one less car trip, saves money, no toxic fumes, less noise, less impact on roads.

EbikeAus   100 W

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Re: Mongoose/ Dyno CX24 200 Build

Post by EbikeAus » Sep 18 2018 6:28pm

Raisedeyebrows wrote:
Sep 12 2018 2:17pm
Seat looks like it's a great improvement, I'll be looking for something similar for mine. The forks you got look much sturdier that the originals too. I'll be watching to see your reaction once you get the motor installed and are riding it, my guess is you are going to get a big grin on your face. I have been riding mine a lot, with the new motor on there please do invest in a good full face helmet if you don't already have one.
Thanks, I'm very happy with how the seat turned out, I took a bit of a gamble buying the seat off ebay but it worked out well.

The zoom forks are nice and solid compared to the originals but like you I might get a nice set down the track.

Good call on the helmet 😎
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EbikeAus   100 W

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Re: Mongoose/ Dyno CX24 200 Build

Post by EbikeAus » Nov 23 2018 5:00pm

I'll be making a few vids of this build.
Here's the first installment

https://youtu.be/eIediyNsjhM
Last edited by EbikeAus on Nov 25 2018 7:09pm, edited 2 times in total.
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