Version 2: https://www.thingiverse.com/thing:2901312

Video: https://www.youtube.com/watch?v=rbaiFQXlgCE
I made some designs for motorising a mountainboard, enjoy!

Please BEWARE that this board runs on 50 VOLTS which can be DANGEROUS working with if you don't take precautions.
Be safe and have fun!

Partslist
Hardware:

• a mountainboard (duh!)
  https://www.mbs.com/boards/10101-mbs-colt-90-mountainboard-constellation
• 10 tooth motor gear (2)
  http://www.ebay.com/itm/8mm-Bore-10-Teeth-10T-Metal-Pilot-Motor-Gear-Roller-Chain-Drive-Sprocket-/371683035348?hash=item568a0908d4
• 68 tooth wheel gear (2)
  http://www.ebay.com/itm/ATV-Quad-25H-68-Tooth-Rear-Chain-Sprocket-For-47cc-49cc-Pocket-Bike-Mini-Moto-/112000123860?hash=item1a13ba43d4
• chain
  http://www.robotshop.com/eu/en/andymark-25-single-strand-riveted-roller-chain-10-feet.html
• chain links (2)
  http://www.robotshop.com/eu/en/connecting-link-roller-chain-25.html
• m4 bolts 5cm (10)
• m5 locknuts (30)
• m8 locknuts (6)
• m5 threaded rod ~26cm (6)
• m5 bolts or rod 6cm (2)
• m8 threaded rod ~20 cm (2)

Electronics:

• vesc (2)
  http://diyelectricskateboard.com/diy-electric-skateboard-kits-parts/vesc-the-best-electric-skateboard-esc/
  http://shop.faradaymotion.com/shop/18-electronics/4-vesc-motor-controller/
• Turnigy SK3 192kv (or any other 12s brushless ~200kv motor) (2)
  i got this one: https://hobbyking.com/en_us/turnigy-aerodrive-sk3-6374-192kv-brushless-outrunner-motor.html
  here is another option: https://www.aliexpress.com/item/Maytech-6374-190KV-e-bike-electric-motor-longboard-motor/32666982968.html?ws_ab_test=searchweb201556_7,searchweb201602_4_10017_507_401,searchweb201603_1&btsid=bac5c47f-cf08-4292-b0fc-a6355c35e43c
• Batteries (make sure the C rating is high enough)
  i got 8 of these cause they were on sale at the time: https://hobbyking.com/en_us/multistar-high-capacity-3s-5200mah-multi-rotor-lipo-pack.html
• RC car radio
  https://hobbyking.com/en_us/hobbyking-gt2e-afhds-2a-2-4ghz-2-channel-radio-system.html

Remember to get wires, charger and connectors for the batteries if you don't have any.
I also recommend an antispark xt90 between the batteries and electronics.

Fjederhaek