KMX Cobra

Get real world experience and user feedback on the electric bicycle products.
Post Reply
User avatar
Ypedal   100 GW

100 GW
Posts: 12519
Joined: Dec 27 2006 12:55pm
Location: Moncton NB, Canada
Contact:

KMX Cobra

Post by Ypedal » Apr 05 2012 12:14pm

After starting this thread on March 6th
http://endless-sphere.com/forums/viewto ... =3&t=37487

I had pretty much made up my mind on the KMX from day 1 but still took some time to look at my options, after some discussion, i sent an email to a kmx dealer in Quebec and asked for a quote, even wrote my email in french to encourage a quick reply ( yeah.. i'm an impulse buyer ) ... a few days went by with no reply...

On march 16th, I got in contact with Recumpence, aka: Matt the RC guy ! , who happens to be a KMX dealer.. within minutes i had a reply to my PM.. and by march 19 funds $$$ were sent... :D

2 days ago, FedEx left a notice of delivery on my door ( go figure, 10 minutes after i left for work.. grrrrr ) .. but later that night :
Attachments
kmx1-fedex.JPG
kmx1-fedex.JPG (39.67 KiB) Viewed 6776 times
ES site status page:
http://www.ypedal.com/ES/ES.htm
----------------
http://www.ypedal.com

User avatar
Ypedal   100 GW

100 GW
Posts: 12519
Joined: Dec 27 2006 12:55pm
Location: Moncton NB, Canada
Contact:

Re: KMX Cobra

Post by Ypedal » Apr 05 2012 12:18pm

kmx2-home.JPG
kmx2-home.JPG (50.23 KiB) Viewed 6774 times
I was quite surprised at the size of the box, i was expecting something quite larger.... was afraid only part of the trike was in there.... :o
kmx3-box.JPG
kmx3-box.JPG (50.65 KiB) Viewed 6774 times
ES site status page:
http://www.ypedal.com/ES/ES.htm
----------------
http://www.ypedal.com

User avatar
Ypedal   100 GW

100 GW
Posts: 12519
Joined: Dec 27 2006 12:55pm
Location: Moncton NB, Canada
Contact:

Re: KMX Cobra

Post by Ypedal » Apr 05 2012 12:23pm

But, yep, it's all in there .. somehow.. terrific packing job.. +1 KMX !
kmx4-stuffed.JPG
kmx4-stuffed.JPG (45.48 KiB) Viewed 6772 times
I'm reminded of the micro-car with clowns that keep comming out.. 3 wheels.. a frame.. nuts, bolts, tools, .. it's all in there..... :shock:

Full color instructions/assembly manual..
kmx5-manual.JPG
kmx5-manual.JPG (42.09 KiB) Viewed 6772 times
3 wheels with parts partially installed, cables neatly zip tied safely into bundles, seat looks very good.... and comfy !
Attachments
kmx6-wheels-seat.JPG
kmx6-wheels-seat.JPG (44.9 KiB) Viewed 6772 times
ES site status page:
http://www.ypedal.com/ES/ES.htm
----------------
http://www.ypedal.com

User avatar
Ypedal   100 GW

100 GW
Posts: 12519
Joined: Dec 27 2006 12:55pm
Location: Moncton NB, Canada
Contact:

Re: KMX Cobra

Post by Ypedal » Apr 05 2012 12:26pm

Frame, nicely protected in bubble wrap.
kmx7-frame.JPG
kmx7-frame.JPG (53.73 KiB) Viewed 6772 times
Very cool candy orange paint:
kmx8-candy.JPG
kmx8-candy.JPG (49.89 KiB) Viewed 6772 times
this thing glows... i love it ! :P
ES site status page:
http://www.ypedal.com/ES/ES.htm
----------------
http://www.ypedal.com

User avatar
Ypedal   100 GW

100 GW
Posts: 12519
Joined: Dec 27 2006 12:55pm
Location: Moncton NB, Canada
Contact:

Re: KMX Cobra

Post by Ypedal » Apr 05 2012 12:33pm

8mm hex and 17mm wrench for the bolts that mount the front wheels brackets to the frame.
kmx9-parts.JPG
kmx9-parts.JPG (45.18 KiB) Viewed 6768 times
The box contains tools, but they are basic cheapies stamped metal that tend to round off nuts ... so i used my own.. :mrgreen:
kmx10-frontwheels.JPG
kmx10-frontwheels.JPG (48.58 KiB) Viewed 6768 times
front wheels on, i had to hold back the urge to just get with it and stick to the instructions.. as hard as that is to the average male.. i'm a firm believer in " try it and if all else fails read the manual "... but RTFM rules in this case was observed .
ES site status page:
http://www.ypedal.com/ES/ES.htm
----------------
http://www.ypedal.com

User avatar
Ypedal   100 GW

100 GW
Posts: 12519
Joined: Dec 27 2006 12:55pm
Location: Moncton NB, Canada
Contact:

Re: KMX Cobra

Post by Ypedal » Apr 05 2012 12:40pm

Bravo kmx for not pre-installing the derailleur hanger, many bikes arrive with bent hangers, and this can be a frustrating event to a newb resulting in a derailleur into the spokes ....

Neatly bagged and tapped to the rear dropouts..
kmx11-hanger.JPG
kmx11-hanger.JPG (55.42 KiB) Viewed 6768 times
ok.. 1st gripe... minor one tho..
kmx12-cable-mounts.JPG
kmx12-cable-mounts.JPG (46.79 KiB) Viewed 6768 times
:evil:

These are made of stiff plastic that will not give, zero bend, they just snap, i tried being gentle, i wiggled and rocked .. and tried my best but snap..

then i tried lube.. :P
kmx13-lube.JPG
kmx13-lube.JPG (42.18 KiB) Viewed 6768 times
but nope.. broke a 2nd one.. :|

Then i got the flat file and opened up the gaps so the rest went as expected, what's going on here is that the brake and shifter cables are not the same diameter, brake cables are larger.... but the mounts are all the same size.

not a big deal tho.. a zip tie and a dab of hot glue will fix this. more on that later.
ES site status page:
http://www.ypedal.com/ES/ES.htm
----------------
http://www.ypedal.com

User avatar
Ypedal   100 GW

100 GW
Posts: 12519
Joined: Dec 27 2006 12:55pm
Location: Moncton NB, Canada
Contact:

Re: KMX Cobra

Post by Ypedal » Apr 05 2012 12:43pm

Seat went on easily.. so did the rear wheel and derailleur..

The chain guides however, gave me some grief, i sat there and scratched my head a while and googles, and youtube searched for video's of how this is supposed to be.. but it seems there have been various changes over the years and nowhere could i find my setup explained for dummies... the diagram in the manual shows how it goes but not in detail....
Attachments
kmx14-chaintubes.JPG
kmx14-chaintubes.JPG (65.35 KiB) Viewed 6766 times
ES site status page:
http://www.ypedal.com/ES/ES.htm
----------------
http://www.ypedal.com

User avatar
Ypedal   100 GW

100 GW
Posts: 12519
Joined: Dec 27 2006 12:55pm
Location: Moncton NB, Canada
Contact:

Re: KMX Cobra

Post by Ypedal » Apr 05 2012 12:45pm

so for the next guy who has to figure this out.. hopefully you find this picture.. not 100% sure if this is how it goes.. but it's how i did it ! :)
Attachments
kmx15-chain-guide2.JPG
kmx15-chain-guide2.JPG (61.53 KiB) Viewed 6765 times
ES site status page:
http://www.ypedal.com/ES/ES.htm
----------------
http://www.ypedal.com

User avatar
Ypedal   100 GW

100 GW
Posts: 12519
Joined: Dec 27 2006 12:55pm
Location: Moncton NB, Canada
Contact:

Re: KMX Cobra

Post by Ypedal » Apr 05 2012 12:49pm

So. after all that.. here she is :
kmx16-done.JPG
kmx16-done.JPG (74.04 KiB) Viewed 6764 times
kmx16-done2.JPG
kmx16-done2.JPG (76.19 KiB) Viewed 6764 times
kmx16-done3.JPG
kmx16-done3.JPG (66.82 KiB) Viewed 6764 times
Above, as you can see, the chain is too long ( meant for longest possible boom position, but i got short legs.. )

So i removed a few links, adjusted the seat to be a bit more upright.. and went for my first test ride !
ES site status page:
http://www.ypedal.com/ES/ES.htm
----------------
http://www.ypedal.com

User avatar
Ypedal   100 GW

100 GW
Posts: 12519
Joined: Dec 27 2006 12:55pm
Location: Moncton NB, Canada
Contact:

Re: KMX Cobra

Post by Ypedal » Apr 05 2012 12:58pm

sorry for all the replies to my one review, it's how i organize my picture archive and re-size process.. :lol:

Ok. so it's cold and cloudy, and windy, holiday tomorrow so work let me out early and i jumped at the opertunity to get home and go for my first test ride.. i had it built last night but it was raining and i did not want to dirty up a brand new bike on day 1 lol..

Front brakes not yet adjusted, but i got rear, so good enough for a test ride..

Seat, way comfortable, you could go all day on this thing and not have a sore ass.. hell.. i see myself going out on late night rides with a case of beer..

There are quite a few adjustments that can be made on this, steering arms can go in or out, adjust radial, but i set it up roughly good enough and kicked off...

oh my, this is FUN !!.. i zipped around the yard getting used to the feel, it has the turning radius of a school bus, but once electrified ( and you can bet it's getting electrified shortly !! ) it will be a good thing at speed..

it gets plenty of looks, cars slow down and stare as they roll by.. people out here are not used to these machines.. and attention is of no short supply....

15 minutes of pedaling up and down my street and my legs are jello.. i predict great soreness..... more to come ! 8)
ES site status page:
http://www.ypedal.com/ES/ES.htm
----------------
http://www.ypedal.com

User avatar
ohzee   1 MW

1 MW
Posts: 1715
Joined: Jul 20 2011 1:13pm
Location: Columbus Ohio USA

Re: KMX Cobra

Post by ohzee » Apr 05 2012 1:07pm

She sure is pretty.. One day id love to have one of those.. Just limited on where id feel safe riding it.
Look forward to watching your progress.

motorino magnet   100 W

100 W
Posts: 188
Joined: Nov 29 2011 3:04pm

Re: KMX Cobra

Post by motorino magnet » Apr 05 2012 1:41pm

Nice spring project

You know a lot about ebikes and I was wondering why you chose that model?

I don't see any suspension .

Is the seat so comfortable and does it have some "road smoothing " capacity?

Noise in the chain ?

Watching with interest.

Cheers

User avatar
Doctorbass   100 GW

100 GW
Posts: 7425
Joined: Apr 08 2007 2:24am
Location: Quebec, Canada East
Contact:

Re: KMX Cobra

Post by Doctorbass » Apr 05 2012 1:47pm

Nice !!!!

I laugh when I have read you said “after 15 minutes my legs are like jello!” … lol… it happened the exact same thing for me the first day I tried it !

Then I discovered that the tire pressure + the angle between the two front wheel is critical !

If they are not well adjusted you can double or more your effort to pedal!!

I adjusted mine with two little cheap laser pointer that I installed to have the beam just on the edge of the side back and side front of the tires and than I adjusted the angle to get the same distance between the two beam spot on the wall on the front of the trike.

Or you can trial and error.

Btw when I saw that Recumpense installed a sterring damper on his trike I immediately boght one for mine.. but I never installed it .. at 80km/h this thing is still stable and have zero wobble

I installed my 5304 hub motor with my torque arm that I soldered directly to the steel frame using my battery trike as the welder source ! It worked great!

I wish you great weather for this long weekend Ypedal so you’ll appreciate it as soon as you wish!

Doc
CURRENT PROJECT: 2WD duo MXUS/Max-E ebike 32kW
http://endless-sphere.com/forums/viewto ... =3&t=65764
-Fastest speed record 117 km/h on flat
-Fastest 1/4 mile@ 114km/h on flat and 16.316 sec
-Succeded to haul a 19200 pounds schoolbus!
113kmh Gianthttp://www.evalbum.com/3406
Mongoosehttp://www.evalbum.com/1947
YOUTUBE---https://m.youtube.com/user/Doctorbasss
http://twitter.com/DocbassMelancon
I speak FRENCH and english

User avatar
Ypedal   100 GW

100 GW
Posts: 12519
Joined: Dec 27 2006 12:55pm
Location: Moncton NB, Canada
Contact:

Re: KMX Cobra

Post by Ypedal » Apr 05 2012 1:53pm

Unlike a bicycle seat that supports a small portion of your rear end only, this cradle distributes your body weight across the entire surface of your back and rear end evenly, suspended between 3 wheels vs on top of 2 inline, not the same..

Suspension would be ideal, but this is priced right and the rear dropouts are flat steel and nicely thick ( i was expecting thicker... but they are ok ) .. i also know knoxie, steveo, doctorbass , FFR trikes, recumpence, and quite a few more have converted KMX with success so the geometry, bits and pieces work..
ES site status page:
http://www.ypedal.com/ES/ES.htm
----------------
http://www.ypedal.com

User avatar
Ypedal   100 GW

100 GW
Posts: 12519
Joined: Dec 27 2006 12:55pm
Location: Moncton NB, Canada
Contact:

Re: KMX Cobra

Post by Ypedal » Apr 05 2012 1:57pm

Doc, thx for the laser idea, i have a few ( drives the dog insane!!, hilarious ), i have messed with it a bit and have it pretty close.. using a tape measure across the spoke nipples from front to back.. tires can certainly use more pressure..

front brakes are on my priority list however.
ES site status page:
http://www.ypedal.com/ES/ES.htm
----------------
http://www.ypedal.com

melodious   100 kW

100 kW
Posts: 1154
Joined: Aug 26 2011 8:57am
Location: East Coast, U.S.A.

Re: KMX Cobra

Post by melodious » Apr 05 2012 2:24pm

Houston, we have a problem...

We just lost another upright rider. :lol:

Enjoi your ride!
Surly Ogre rigid 29er, rear 10T MAC @ 50V 25AH & 40A: 30mph road/gravel/hill machine
42" dual diagonal Eskateboard @6s & 90mm wheels
Next: eMTB @10-12s & 8"-12" pneumatic wheels; Got Strapped? d-(',')z

motorino magnet   100 W

100 W
Posts: 188
Joined: Nov 29 2011 3:04pm

Re: KMX Cobra

Post by motorino magnet » Apr 05 2012 2:37pm

I'm excited too!

What does she cost landed and delivered into Canada-like me?

I'm wondering whether to buy the Cobra or the Typhoon or the Tornado....


I'm 6' 5" and 250 lbs

cheaper one looks good to me?

just came back from a three hour tour of my regular bike and my AZZ is numb...neck and wrists are sore too!


Thank god for drinkable ethanol :shock:

User avatar
The fingers   100 GW

100 GW
Posts: 6330
Joined: Mar 11 2012 11:22pm
Location: Desert Pacific Cali USA

Re: KMX Cobra

Post by The fingers » Apr 05 2012 2:43pm

Now I know what my dream bike looks like!
Black Schwinn High Sierra
Blue Schwinn Cruiser 5
Blue Schwinn High Plains
Black Fiore Cruzer 5: Amped Warp Drive 26" Front DD/SLA kit
http://ghostbikes.org/
http://www.rideofsilence.org/main.php
Hebrews 9:27

User avatar
Sacman   10 kW

10 kW
Posts: 750
Joined: May 27 2008 3:42am
Location: Corona & Irvine, California, USA

Re: KMX Cobra

Post by Sacman » Apr 05 2012 2:48pm

That looks SWEET Gaston! Can't wait till you put the electrics on it and start blasting around town. :mrgreen:

User avatar
Pure   10 kW

10 kW
Posts: 743
Joined: Jan 31 2009 11:54pm
Location: Jacksonville, FL

Re: KMX Cobra

Post by Pure » Apr 05 2012 3:07pm

Very cool ypedalman.

So for the front brakes, What keeps one from pulling more than the other? Is it as simple as adjusting the cable tension?
Mongoose DH
X5304
60V20Ah LiFePO4

I'm polymerized tree sap and you're an inorganic adhesive, so whatever verbal projectile you launch in my direction is reflected off of me, returns to its original trajectory and adheres to you. So there!

kevo   100 W

100 W
Posts: 296
Joined: Sep 15 2009 9:40pm

Re: KMX Cobra

Post by kevo » Apr 05 2012 3:23pm

Excellent photos and build YPedal. I was sitting on the fence between the KMX trike and Lightning P38. EIther way the recumbents are amazing and we look forward to your reviews!
Thanks Justin of http://ebikes.ca for your amazing talents, dedication and contributions to ES!
Post licensed under "Open Source" http://creativecommons.org/licenses/by-nc-nd/3.0/

User avatar
recumpence   100 GW

100 GW
Posts: 5286
Joined: Apr 19 2008 8:33am
Location: On Earth right now. That can change at any time, though..........

Re: KMX Cobra

Post by recumpence » Apr 05 2012 5:52pm

Glad you got it all figured out.

Yes, the chain routing is a freakin pain. But, it is better than the 2010 models.

Matt
1% of the world's population can think "Outside the box". The rest are firmly stuck within the box. Where are you?

User avatar
Sacman   10 kW

10 kW
Posts: 750
Joined: May 27 2008 3:42am
Location: Corona & Irvine, California, USA

Re: KMX Cobra

Post by Sacman » Apr 05 2012 6:19pm

Ypedal wrote:
kmx16-done3.JPG

I couldn't help but notice ... that chain guard (TUBE) covers about 70% of the entire chain length.
Doesn't that add a lot of friction working against the rider's pedal power (not that it'll matter once you put your motor in there)? :mrgreen:
And does the chain rattle in the tube?

User avatar
oatnet   10 MW

10 MW
Posts: 2331
Joined: Apr 26 2007 3:03pm
Location: SoCal, USA

Re: KMX Cobra

Post by oatnet » Apr 05 2012 10:10pm

Nice KMX, Y!

Now I've seen the "before" pictures, I'm ready to see you molest it. :mrgreen:

-JD
Member 117 of 26,000+

153v DUNE BUGGY © 164v Vectrix E-Moto © 72v Norco A-line/x5403 © 60v Specialized Enduro Comp/BMC © 72v x5tracycle © 48v TF IO/BMC © 36v Kepler FrictionDrive © Spot-Welding a123 © Pelican Front Packs © Vectrix Battery Replacement © MORE !!


Image大鸡巴 Motors
Knowledge is acquired through experience, everything else is just information - Albert Einstein
"Cheater?" I'm not competing, I'm Commuting!

User avatar
Ypedal   100 GW

100 GW
Posts: 12519
Joined: Dec 27 2006 12:55pm
Location: Moncton NB, Canada
Contact:

Re: KMX Cobra

Post by Ypedal » Apr 05 2012 10:41pm

Ok.. many replies to cover..

melodious , yes and no, the trike should be ok certain trips, but there are places i go that a trike will not be safe to use, so the e-BMX and the other 2 wheelers will remain in service....

motorino magnet , cost, check with recumpence, shipping is what really makes a difference, i paid retail 1650 $ but got a really good deal on shipping :wink: .. at 6ft 5 and 250 you are at the upper limit of these things, wheel size is the biggest concern, 20/24 is what my ideal setup required so that's what i got.. but depending on hub or chain drive and all that, determines what you need, the frames appear identical across the various models, it's a matter of wheel size and components ( brake, shifters etc. ) .

The fingers, information is key, take the time to read up on the details and go from there, i decided on the KMX knowing it would electrify, and the square tubes make easy mounting of various things..

Sacman , hell yeah, i'm going to ride around for a few days to get the thing dialed in, then comes the X5304 in 24" i have in a box ready to go.. along with an 18 fet controller for 24s lipo and 100 amps.. *note to self.. contact doctorbass and order another set of dropout plates....

Very cool ypedalman.

Pure : " So for the front brakes, What keeps one from pulling more than the other? Is it as simple as adjusting the cable tension? "

That, was interesting, the bike comes complete but not tuned up, the brake pads needed adjusting so that the calipers would not rub, once that was done, i pulled in all the barrel adjusters on the calipers and brake lever ends, pulled out the slack from teh cables, then using a rubber band to apply a fixed pressure on the brake lever i adjusted the barrels so that both wheels would come to a stop from a light manual spin equally.. then removed the rubber band and they are both engaging equally..

I'm sure there are better ways.. but that's how i did it without looking it up online. :P
ES site status page:
http://www.ypedal.com/ES/ES.htm
----------------
http://www.ypedal.com

Post Reply