I always kinda liked the way these Crazy Karts work they look like fun. A few days ago I watched a Hoonigan video of them racing so I guess they are cool and I should build one. Gas Powered predator 79cc should work fine. I built the frame out of some old shelving 29" x 40" The real ones crazy kart Xl are about that size. The way the castors on the back work with the drift handle is they lay back a bit to keep it straight then when you want to drift you pull the bar and they come up and swivel easily. So I started building the engine frame with an old water pump bearing. Trying to keep it as tight around and short as possible. Its going well. I figured the gear ratio with a jackshaft to be about 8.5:1 with the 9.5" pocket bike tire on a 4" wheel would be about right.
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