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Thread: Converting pit bike to electric. Advice needed please

              
   
   
  1. #1
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    Converting pit bike to electric. Advice needed please

    Hello ,
    I want to convert the pit bike shown or similar to electric so that my 10 -11 year old son son can ride it without disturbing the neighbourhood. There are kids motorbikes out there for sale ready made but they are all too small for him and a bit "toyish".
    The pit bike is not very large about 120 lbs without the engine and my son is not heavy and I have a few questions about the conversion.

    1.) What sized motor wattage and voltage would be an ideal size to give it a good but safe turn of speed and make it perform well over cross country. I am thinking 36v 800w?

    2.) Can I use a twist throttle and speed controller etc kit suitable for an electric bicycle or quad bike. Obviously for this wattage.

    3.) If I keep the rear wheel exactly as it is would an ideal sprocket on the motor be 14 tooth or should it be less or more?
    Thanks
    pit bike.jpg

  2. #2
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    Has no one got any advice on this ?

  3. #3
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    Has no one got any advice on this ?

  4. #4
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    I will try another forum but I thought this one would be ideal for a project like mine.

  5. #5
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    Things tend to be a bit slow around here compared to a lot of forums. I'll give you my two cents, though:

    1. 36v, 800w would be good for a kid's pit bike. It'd be fun and manageable. Range is a question of total battery size, measured in Wh (watt-hours). Watt-hours is volts times amp-hours. You'll need to decide what kind of battery you use (lead is simple and cheap but heavy, lithium is expensive and can be complex but light and powerful). Since this is your first project and just for fun, I'd actually recommend lead. You could get (3) 12v, 18ah batteries and put them in series for 36v, which would get you about 650Wh. This would be plenty to putter around the neighborhood or pits for a few hours.

    2. If you find such a kit with throttle and speed controller rated for 800w, go for it. No reason it wouldn't work on a pit bike. There are plenty of kits of various wattages, but be warned that most a cheap Chinese imports. Functional, but often without a manual or documentation.

    3. That depends on a few factors. Use this calculator to figure it out: https://www.4qd.co.uk/road-speed-calculator/ I would guess that you'll want a pretty big gear ratio, like 5:1.

  6. #6
    Senior Member Stevo's Avatar
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    Exclamation

    For that bike, you could fit a ME 0909 and use a Axe 4834, which I happen to have and can give you a good deal on.
    Then use 6 Nissan leaf modules to power it. That would be fun toy, but still heavy. If you open up the sardine cans and change the pouch config, you could reduce the cost, weight and size of the battery pack. You would only need 3 leaf modules and connect the 12 pouches in series. You'll only end up with ~30 aHr, but only a 25 lb battery pack, roughly 9" x 12" x 5".
    Don't overvolt an ME909 to 60 volts. I'd keep it closer to 50 v and it should work well. Alot of power for that little pitbike for sure. It will get up to 50 mph no problem
    Last edited by Stevo; 4 Weeks Ago at 2051.
    Original build: http://vorworxemc.wix.com/vorworx
    Current rides: '96 Honda Ohlins VFR, '03 Cannondale C440R, '03 Cannondale Cannibal, '06 Yamaha 450 Wolverine 4x4

  7. #7
    Senior Member DRZ400's Avatar
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    Go to monster scooter parts and buy a 36v 600 watt scooter motor, 36v ESC and throttle. (3) 12v AGM 12ah batteries and a 36v 3amp charger. You will have to fab up a motor sprocket.
    2003 Ninja 250EX, Agni #95R, 6:1 Gearing, 11 Leaf Modules.
    Alltrax SPM72400, 400 amp Controller, all LED lighting
    2014 CRF450X Supermoto
    http://www.evalbum.com/1955
    http://www.evalbum.com/3337

  8. #8
    Senior Member DRZ400's Avatar
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    Better yet use hover board batteries. On ebay dirt cheap with BMS
    2003 Ninja 250EX, Agni #95R, 6:1 Gearing, 11 Leaf Modules.
    Alltrax SPM72400, 400 amp Controller, all LED lighting
    2014 CRF450X Supermoto
    http://www.evalbum.com/1955
    http://www.evalbum.com/3337

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