MH RYZ (derbi 50cc)

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guiga   100 mW

100 mW
Posts: 45
Joined: May 27 2018 11:54am

MH RYZ (derbi 50cc)

Post by guiga » Mar 05 2021 6:43am

Hi everyone , just wanna show up what im doing at the moment.
Bougth a motorhispnia 50cc bike it has the same frame as derbi senda 50cc but the frame is made of steel.
My goal is try to make less heavier then original with a lill more power of course.

mortorhispania 50cc frame modified (im not a welder guy so spare me lol)
QS 4KW as direct drive with 10t front sprocket and rear sprocket 59t
KLS 7250 NR (thats what Kellys called cause it does flux weakening)
400amsp ant bms
20s 12p 21700 cells( still unknow with brand)
Wheels with rim size modified from 18x2,15 to 17x1.85 and 21x1.16 to 19x1.10
suspension from a pitbike that i have (800mm and 320mm)
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guiga   100 mW

100 mW
Posts: 45
Joined: May 27 2018 11:54am

Re: MH RYZ (derbi 50cc)

Post by guiga » Mar 06 2021 8:51am

Damm , the bolt nut was hard but my impact tool did the job but the sprocket broke my removel tool lol so
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any ideias how to remove the sprocket from motor?.

hugok   10 mW

10 mW
Posts: 22
Joined: Mar 05 2021 5:40am

Re: MH RYZ (derbi 50cc)

Post by hugok » Mar 06 2021 9:18am

Get a better removal tool!

I'm a bit jealous of your chassis, I'm building on the old Rieju Drac and have no good place for batteries.

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guiga   100 mW

100 mW
Posts: 45
Joined: May 27 2018 11:54am

Re: MH RYZ (derbi 50cc)

Post by guiga » Mar 06 2021 5:46pm

The delta box style frame is bether for battery placement but if you do your own battery pack then you can shape in any form to fit the chasis.

guiga   100 mW

100 mW
Posts: 45
Joined: May 27 2018 11:54am

Re: MH RYZ (derbi 50cc)

Post by guiga » Mar 08 2021 8:26am

The controller arrived! Need to thanks Fany from Kelly controllers for great support. The controllers come well packed and looks build with quality.
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guiga   100 mW

100 mW
Posts: 45
Joined: May 27 2018 11:54am

Re: MH RYZ (derbi 50cc)

Post by guiga » Mar 08 2021 12:48pm

Weld the motor supports. Now looking for a controller placement.
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MikeSnow   10 µW

10 µW
Posts: 6
Joined: Feb 05 2021 1:24am

Re: MH RYZ (derbi 50cc)

Post by MikeSnow » Mar 08 2021 2:16pm

The motor mount welds look more like my type of welding :lol:

guiga   100 mW

100 mW
Posts: 45
Joined: May 27 2018 11:54am

Re: MH RYZ (derbi 50cc)

Post by guiga » Mar 08 2021 5:12pm

Lol i hate it to but im still learning welding. They look ugly but they are strong enough. Still need clean and repairs missing welds.

hugok   10 mW

10 mW
Posts: 22
Joined: Mar 05 2021 5:40am

Re: MH RYZ (derbi 50cc)

Post by hugok » Mar 09 2021 1:20am

What kind of welder do you have? I have a cheap stick welder and when using 1.6mm electrodes I found it way easier to get a good weld. Now i got a cheap ass MIG with protection gas, havent tested it much but seems even easier to get a good weld.

guiga   100 mW

100 mW
Posts: 45
Joined: May 27 2018 11:54am

Re: MH RYZ (derbi 50cc)

Post by guiga » Mar 09 2021 2:35am

I used a stick welder with 3.2 mm electrodes at 110amps. Order already some 2mm to try. The welds was not finished and clean. I think the mig is probably the best option.

guiga   100 mW

100 mW
Posts: 45
Joined: May 27 2018 11:54am

Re: MH RYZ (derbi 50cc)

Post by guiga » Mar 09 2021 3:50pm

Controller mounts done , now need to figure out the battery design
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hugok   10 mW

10 mW
Posts: 22
Joined: Mar 05 2021 5:40am

Re: MH RYZ (derbi 50cc)

Post by hugok » Mar 10 2021 5:28am

I would have placed the controller where you have it in the first pictures since I would like to use the space where you have it now for batteries - but it all depends on the form of the battery.

Its also a matter of getting the weight of the batteries as close to the ground as possible to get a low center of gravity.

guiga   100 mW

100 mW
Posts: 45
Joined: May 27 2018 11:54am

Re: MH RYZ (derbi 50cc)

Post by guiga » Mar 10 2021 8:49am

I think i may go with 20s10p 21700 batteries. What do you guys think of this shape?
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guiga   100 mW

100 mW
Posts: 45
Joined: May 27 2018 11:54am

Re: MH RYZ (derbi 50cc)

Post by guiga » Mar 10 2021 8:52am

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guiga   100 mW

100 mW
Posts: 45
Joined: May 27 2018 11:54am

Re: MH RYZ (derbi 50cc)

Post by guiga » Mar 10 2021 8:56am

All the weigth gonna be in the midle of the bike and is also compact. Still lower center of gravity than original bike with full gas tank. I reckon the bike will weigth less then 70kg.
21700 samsung 40t cells? They are avaiable in nkon.nl store.

hugok   10 mW

10 mW
Posts: 22
Joined: Mar 05 2021 5:40am

Re: MH RYZ (derbi 50cc)

Post by hugok » Mar 10 2021 9:16am

It looks good! I didn't realize you would be able to fit the battery like that!

Have you decided which battery cell to use?

SlowCo   1 MW

1 MW
Posts: 1717
Joined: Jan 05 2015 5:43pm
Location: The Netherlands

Re: MH RYZ (derbi 50cc)

Post by SlowCo » Mar 10 2021 9:33am

Interesting build :thumb:
Will you be able to get it registered in Portugal as a road legal electric moped or motorcycle?

guiga   100 mW

100 mW
Posts: 45
Joined: May 27 2018 11:54am

Re: MH RYZ (derbi 50cc)

Post by guiga » Mar 10 2021 12:21pm

Hi , no chanse for road legal unfortanly. Thats Portugal! After installing the seat , i have to say i love , the mods i did to the frame chassis worked well. Gonna order 202cells 21700 samsung 40t .
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guiga   100 mW

100 mW
Posts: 45
Joined: May 27 2018 11:54am

Re: MH RYZ (derbi 50cc)

Post by guiga » Mar 11 2021 3:13pm

Been repairing welds and grinding so i can paint the frame. Damm its hard to grind in small spaces!
Looks so much bether with some paint on it.
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hugok   10 mW

10 mW
Posts: 22
Joined: Mar 05 2021 5:40am

Re: MH RYZ (derbi 50cc)

Post by hugok » Mar 12 2021 4:33am

Now it looks professional :bigthumb:

Looking forward to your battery build!

guiga   100 mW

100 mW
Posts: 45
Joined: May 27 2018 11:54am

Re: MH RYZ (derbi 50cc)

Post by guiga » Mar 12 2021 4:55pm

Motor and controller in place , still waiting for batteries to come. Next gonna mount some front suspension and wheels.
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guiga   100 mW

100 mW
Posts: 45
Joined: May 27 2018 11:54am

Re: MH RYZ (derbi 50cc)

Post by guiga » Mar 13 2021 9:04am

Some progress. Had to adapt wheels suspension , etc.
Not easy task but have to be done and voila!
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EVOXY6768   10 mW

10 mW
Posts: 28
Joined: Jun 28 2020 9:31pm

Re: MH RYZ (derbi 50cc)

Post by EVOXY6768 » Mar 13 2021 1:15pm

Very nice build. That is going to be a weapon :bigthumb: How are you going to mod your motor sprocket to except a smaller 10t sprocket ?

guiga   100 mW

100 mW
Posts: 45
Joined: May 27 2018 11:54am

Re: MH RYZ (derbi 50cc)

Post by guiga » Mar 13 2021 2:02pm

Hi there , will be a 10 front sprocket wit 59 tooth rear sprocket so will be a 1x5.9 gear ratio on a 17 inch wheel.
What you guys reckon? bike under 70kg with a qs 138 4kw motor , kelly kls 7250 400 phase amps and 20s10p 21700 samsung batteries.
I notice that the controller only comes with a 150amps slow fuse so may not be so strong???

Elektrosherpa   10 W

10 W
Posts: 81
Joined: Feb 07 2021 8:19am

Re: MH RYZ (derbi 50cc)

Post by Elektrosherpa » Mar 13 2021 3:50pm

Looks cool. I like how you put the controller-looks a bit like an aircooled cylinder of combustion engine.

I am also converting a dirt bike, so I am watching such threads with special attention.

From your pictures, I got 2 questions:
Are you going to fix the motor only on ONE SIDE (sprocket side)?
And is there any reason why you drilled so many holes into the holder- but seem to be using only 2 of them?

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