Vintage Electric MX (YZ80)

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Rickard m
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Vintage Electric MX (YZ80)

Post by Rickard m » Dec 20, 2017 4:02 pm

Hi, I never got a dirt bike when I was young, but my dream was one of these:
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A few weeks ago I found these really cheap
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Some new parts arrived
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Started to fabricate
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Starting to look like a bike again :D
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Rube
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Re: Vintage Electric MX (YZ80)

Post by Rube » Dec 20, 2017 8:27 pm

Woohoo for nostalgic dreams, I rode one of these and a KX when I was growing up. Excellent fabrication skills, looks like it's going to be a very tidy build.
Last edited by Rube on Dec 20, 2017 9:31 pm, edited 1 time in total.

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skeetab5780
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Re: Vintage Electric MX (YZ80)

Post by skeetab5780 » Dec 20, 2017 8:32 pm

Ya nice fab skills and great bike. My first bike was a 1985 kx80 then a 1992 yz125

Cant wait to see the video!

Rickard m
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Re: Vintage Electric MX (YZ80)

Post by Rickard m » Dec 21, 2017 12:33 am

Thank You! Made in Japan, perfected in Sweden with parts from China :D

I don't know so much about this, just try and error, exited to try it out, see how things work out together. The build part is sooo fun, hopefully fun to drive too.

I went with the original size chain 428, the smallest front sprocket I found for 20mm axle was 11. The bikes came with 42 resp 49 theet. I choose 49, still feels small when I look at your other builds, but remember the rear tire is tiny... :roll: bigger rear ones I have found online.

The battery is 72v 30ah, How do I keep it alive as long as possible, charge often or only when emty? Now when it came it was 70,8v shall I charge before first ride? (There is no memory in these I assume)

AMM118
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Re: Vintage Electric MX (YZ80)

Post by AMM118 » Dec 22, 2017 12:10 am

Cool build bro!

Rickard m
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Re: Vintage Electric MX (YZ80)

Post by Rickard m » Dec 25, 2017 4:21 am

Merry christmas! Tried it for a short spin yesterday :D
[youtube]https://youtu.be/72pG6jHKTBM[/youtube]

My daughter i shouting that it is slippery and that I can fall. So I did after the video... :roll: the bike managed but my jeans broke on the knee :wink:

I think I would like to increase the throttle response, how do I do that? What parameter shall I adjust? (The golden motor controllers) I have an usb cable connected to the controller, but I have not managed to get it in the computer yet.

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Re: Vintage Electric MX (YZ80)

Post by dustNbone » Dec 25, 2017 8:27 am

Ahhh the old Whizzer 80. My first dirtbike was a 1992, aside from frequent top end rebuilds (pretty much par for these little 2 strokes ridden hard), it's always served me well. The only failure I ever had was when the Yamaha dealer didn't reassemble the airbox correctly and a steel washer found it's way into the (brand new) cylinder at high RPM. That ended poorly.

But I still have the bike, I've never been able to sell a motorcycle in my life :(

About your battery:

Lithium batteries don't have "memory" as such but they don't like being drained fully or left fully charged (or empty) for extended periods. A fully charged 72V battery should be around 84V, 70.4 is quite low so I'd give that a charge before you ride it. I'm surprised they shipped it at that voltage. Try to have it around 50% full for storage purposes.

Search around ES here and you'll find lots of solid info on battery care, real world experiences not theoreticals.

Best of luck and much fun with your new toy!

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gogo
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Re: Vintage Electric MX (YZ80)

Post by gogo » Dec 25, 2017 8:27 pm

If those swingarms are steel you could mount the motor on one to get more battery space.
"A conclusion is the place where you got tired of thinking." -Steven Wright

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fechter
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Re: Vintage Electric MX (YZ80)

Post by fechter » Dec 25, 2017 9:57 pm

Great sheet metal skills there.

For sure charge that battery up fully and watch it like a hawk toward end of charge. You want to make sure the cells are all balanced before you go out and discharge it. If you plan to not use if for more than a day or so, then a lower level of charge is good.
"One test is worth a thousand opinions"

Rickard m
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Re: Vintage Electric MX (YZ80)

Post by Rickard m » Dec 27, 2017 3:43 pm

I' sort of done now. Drilled a hole in the "gas tank" put in some cables with over lenght there.
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I also have the charging port under the noraml gas cap.
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Filling up takes longer time in the "future" :lol:
As you can see, I also printed out a storage container for the right side of the tank so I had something to screw the radiator shroud to.

Like I said prevously, I would like to get little better throttle response. But I have problems with conecting to the controller. I have the GM programe PI-800 and a programing USB-cable. But it won't connect. I have Window 10. Do I need some sort of extra driver? Where can I get that? ( i'm not good at computers(!)) :oops:
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But I'm very pleased with the looks, almost looks like the first advertising picture from 1983 that I started this tread with :cool:
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fechter
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Re: Vintage Electric MX (YZ80)

Post by fechter » Dec 27, 2017 8:09 pm

Yes, you need a driver for the USB cable. It should come from whoever made the cable.
You may also need to change the COM port setting in the programming software to match whatever number your computer assigns to that cable.
"One test is worth a thousand opinions"

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skeetab5780
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Re: Vintage Electric MX (YZ80)

Post by skeetab5780 » Dec 28, 2017 10:06 am

That thing looks so sweet! I love it

Keep the motor where it is!

Rickard m
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Re: Vintage Electric MX (YZ80)

Post by Rickard m » Jan 01, 2018 12:36 pm

Thank you!
I had two small piecis of the extruded aluminum cooling fins left, I guess you can't get to cool so I bended one piece to fit the motor and one piece can sit in front of the controller, is there some kind of glue that transfer heat? "steel epoxi"?
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I got hold of the cable driver from golden motors, The driver didn't work on my Windows 10 laptop but I tried on my old one from 2003 with XP, there it worked and I seemed to get connected now :D .

Like I said I want to get better response/ torque-feeling, want to optimize the parameters before I go into gearing/sprockets. Don't really know what could be optimized. (the battery I have is a 72V said to have: Maximum Continuous Discharge Current (A) 50A, instantaneous Maximum Discharge Current (A) 150A )

Please have a quick look at the print screen pictures below of what is say now, what do you recomend me to change? :
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Initally it said 200rpm/s on the acceleration, I changed that to 800rpm/s now. I assume that is a big difference if it have the power to do it.. I have not been able to test it yet since the rain have been pouring down the whole day.

So what else do you think, what will "enable" boost do? (sounds fun at least ) Is there where I shall set 150A since that is my maximum discharge current?

Otherwise I have also found a slightely bigger rear sprocket, 54 instead of my 49 I have now, I don't really need the top speed. I prefer to be able to lift the front wheel :twisted:

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Re: Vintage Electric MX (YZ80)

Post by Buk___ » Jan 01, 2018 3:13 pm

Rickard m wrote:
Jan 01, 2018 12:36 pm
is there some kind of glue that transfer heat? "steel epoxi"?
Something like Elecolit

Rickard m
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Re: Vintage Electric MX (YZ80)

Post by Rickard m » Jan 03, 2018 6:16 pm

Now I have tested the bike with 800rpm/s setting, big improvement. Starting to get funny now :twisted: obviously it is possible to go all the way to 1200rpm/s. I Shall try that next time. EDIT, tried but got error message when I entered greater than 800. Seems to be the limit any how. ((rpm/s):50.0 jÜxjÜ)

Also then I'm little comfused about the current settings. My battery is 72v and Maximum Continuous Discharge Current 50A, instantaneous Maximum Discharge Current 150A . Must the controller settings be Below that or is it recomended to have higher Numbers than the rated battery? And it just gives as much as possible? If I look in the available parameterns there is Also one called start, How long is the start current valid? (Standard value 15A seems low, or?) Difference between rated and maximum current? 190A resp. 210A as initial standard setting. (The controler Rated continuous current is 80A, Maximum phase current: 220A.) When do I get the motors Said 6kW peak power? During those 10 seconds Max duration as it says now? What/when is boost then? Shall I enable that? That is sat on 80A now,(disabled at the moment) diffrence to maximum? Could someone with better hang on these please give me some advice, Thank you!

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