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Thread: Derbi GP-1 Electric Conversion

  1. #46
    apriliaforum expert scottydog's Avatar
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    So the project hasn't been forgotten, but I did have some issues to contend with! But finally I got it all completed so will look at where I left off and put up some photos!
    Currently

    Honda MBX, Dream 50, Solo 50, NSR, CBR 150
    Moriwaki 80, Derbi GPR50

    In works

    Honda NSR (SP)
    Honda RVF150R / NR150 custom

    Previously

    Kawasaki AR80
    Honda RS125

  2. #47
    apriliaforum expert ToraTora's Avatar
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    Looking forward to it with excitement!

  3. #48
    apriliaforum expert scottydog's Avatar
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    I needed to fit the hub motor to the bike, so came up with this idea below. At first I went with a solid design, but realized it would be way easier to have the mounts laser cut and use an aluminium shim to fit tightly. So I drew up in CAD and had the second set of components laser cut.
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    Currently

    Honda MBX, Dream 50, Solo 50, NSR, CBR 150
    Moriwaki 80, Derbi GPR50

    In works

    Honda NSR (SP)
    Honda RVF150R / NR150 custom

    Previously

    Kawasaki AR80
    Honda RS125

  4. #49
    apriliaforum expert Rj_666's Avatar
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    Forgive a bunch of electric 'newb' questions -

    How do these hub motors stand up to environmentals?
    I like the look of the Bolt as well, but kind of the same question - how does that motor mounted low down, in the 'splash zone of the front wheel handle slop being sprayed up on it ?

    Strikes me one of the REALLY critical factors is the balance ... having a slug of batteries mounted up high seems problematic. Granted, having an AM6 mounted in the ame location is more or less equivalent, but what is the weight like on the batts ?
    =My Iron Maiden=
    1999 Aprilia RS50
    Doppler endo crank
    Barnett Clutch
    Stage6 24mm PWK clone w/powerjet
    Pre-mixing Trick 101 octane / Motul 800 @38:1
    Top Performance 8 petal Reed Block w/ Stuffer
    Top Performance TPR aluminum, 50 mm piston, 1 ring
    Yasuni R2 Carbon Exhaust
    13/43 final gearing
    AF1 spring upgrade & 'Martin77 / Mattology' preload adjusters
    DNM 'MT-Bag' 3 way adjustable rear shock absorber
    Mitas MC50 tyres
    Brembo RCS 14 front master / NG rotors / Ferodo pads

  5. #50
    apriliaforum expert scottydog's Avatar
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    So the hub motors come in various degrees of "quality". Mine is a reasonable level, but not the best. They do get rusty inside over time as moisture gets drawn in when heating and cooling. One of my hubs I stripped and sealed filling with thin oil for cooling and rust prevention.

    I agree with the weight so better to keep low. My finished scooter weights twenty-something kg more than the 50cc I used but is still 5 - 7 kg less than the 125cc version. I have the exact numbers somewhere. The plan in time is to replace the cells with much better ones which will shed 50lbs and place it lower, putting the bike at the same or slightly less than the 50cc original!
    Currently

    Honda MBX, Dream 50, Solo 50, NSR, CBR 150
    Moriwaki 80, Derbi GPR50

    In works

    Honda NSR (SP)
    Honda RVF150R / NR150 custom

    Previously

    Kawasaki AR80
    Honda RS125

  6. #51
    apriliaforum expert scottydog's Avatar
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    Once I got the bits made I inserted them and fitted into the swingarm as seen below.

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    Currently

    Honda MBX, Dream 50, Solo 50, NSR, CBR 150
    Moriwaki 80, Derbi GPR50

    In works

    Honda NSR (SP)
    Honda RVF150R / NR150 custom

    Previously

    Kawasaki AR80
    Honda RS125

  7. #52
    apriliaforum expert ToraTora's Avatar
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    When I was in high school we had a word to describe this sort of setup:

    Sano!

  8. #53
    apriliaforum expert scottydog's Avatar
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    Quote Originally Posted by ToraTora View Post
    When I was in high school we had a word to describe this sort of setup:

    Sano!
    Cool Tora! I just searched what Sano meant and yeah totally that is the way I always try to mod my bikes....... so they look factory like! At the moment everyone who has seen the bike says it looks like it came that way which is a massive compliment!

    I got two bonuses at this point of the build! One was that I scored a brand new hub motor for free! It isn't a super high quality one that I will go with later one, but it is plenty good to get the project rolling with a nice shiny new wheel!

    The other big score was when I realised the 3 bolt pattern on the hub drive looked just the same as my old Japanese style NSR. I had bought 3 styles of floating disks almost 20 years ago for my NSR at the time and never used them. The bikes were long since gone so they were just collecting dust! But now they have a perfect use and the final look fitted on the bike looks sweet!
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    Currently

    Honda MBX, Dream 50, Solo 50, NSR, CBR 150
    Moriwaki 80, Derbi GPR50

    In works

    Honda NSR (SP)
    Honda RVF150R / NR150 custom

    Previously

    Kawasaki AR80
    Honda RS125

  9. #54
    apriliaforum expert scottydog's Avatar
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    The one challenge with the hub drive is it is a 13" rim, where the standard rim on the GP-1 is a 14" one. So to keep the bike from looking funny I needed to match the outside diameter of the tyres.

    The 14" tyre is a 140/60 and on paper a 13" 130/70 is equal. I could have gone with a 140/70 in 13" also, looking a the photo it would look like the 140 wide 13 would be an even closer match? There is always another time! If I do this I will need to find an adjustable height shock as the bike is pretty tall as it is, so knocking 1/2" would not be a bad thing in my opinion!
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    Currently

    Honda MBX, Dream 50, Solo 50, NSR, CBR 150
    Moriwaki 80, Derbi GPR50

    In works

    Honda NSR (SP)
    Honda RVF150R / NR150 custom

    Previously

    Kawasaki AR80
    Honda RS125

  10. #55
    apriliaforum expert scottydog's Avatar
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    Been a while since the last post. The bike has been completed and just refining it for now for gradual improvements. Made a short vid some months back of an early test ride.

    Currently

    Honda MBX, Dream 50, Solo 50, NSR, CBR 150
    Moriwaki 80, Derbi GPR50

    In works

    Honda NSR (SP)
    Honda RVF150R / NR150 custom

    Previously

    Kawasaki AR80
    Honda RS125

  11. #56
    apriliaforum prov-nov
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    Wow, that's really nice. Id like to convert my Aprilia SR 50 Ditech to electric but looks like a lot of work...

  12. #57
    apriliaforum expert scottydog's Avatar
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    Quote Originally Posted by jolaine View Post
    Wow, that's really nice. Id like to convert my Aprilia SR 50 Ditech to electric but looks like a lot of work...
    Hey cheers! It was for sure a lot of work, I have everything to build a second but lost enthusiasm for it so just working on my 2T bikes for now! I think the SR50 would be a nice one, but would have bigger compromises as there is less space for batteries. Means you would have to use 18650 battery packs and probably lose the helmet storage. You could get a ready to go swingarm and motor kit though which is nice would probably drop in.

    As for the riding experience there is nothing like it! The low speed performance in traffic is perfect and the efficiency is really good so operating costs are low, expect to be 1/3 the cost of petrol costs. The other thing though is the insane acceleration, if you watch Tesla videos you'll get some idea of what I mean, overtaking is never an issue!
    Currently

    Honda MBX, Dream 50, Solo 50, NSR, CBR 150
    Moriwaki 80, Derbi GPR50

    In works

    Honda NSR (SP)
    Honda RVF150R / NR150 custom

    Previously

    Kawasaki AR80
    Honda RS125

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