Hi, I saw this kind of cart first from youtube posted by Daddy Handy. I made some changes I thought would be good for my son and can be more safe to drive.
Credits to    • DIY Go Kart Powered by Drill Motor  

Parts list I used to build this Go Kart
- Most parts recycled. Other hardware purchased from Lowes.

1. Dewalt Drill (or any drill)
2. 4X2 stud 6 ft 2 pieces ( I used left over wood from cement project)
3. A seat ( I used broken leg chair)
4. Electric wires ( to connect to switch with drill)
5. Electric wire connectors few.
6. Hand Air pump ( $5 hand air pump. I used broken pump)
7. A frisbee
8. 2 Springs
9. Three small eye hooks
10. 4 Wheels ( from Harbourfreight)
11.Tie wraps as needed.
12.1/2in-13 x 2-ft threaded rod 2pieces
13.1/2in pipe strap 4 Pieces
14.5/16-in x 4-in Lag Screw Eye 3 Piece
15.7/16-in Zinc-Plated Standard (SAE) Hex Nut 12Pieces
16.7/16-in x 1-1/4-in Zinc-Plated Standard (SAE) Flat Washer 8 Pieces