What I need to make an off road go kart

[Kenny_McCormic]

A 1 inch (24.7mm) clutch is $60. A 3/4" (19.05mm) cluthc is only $30!

 

[BradenM]

A 1 inch (24.7mm) clutch is $60. A 3/4" (19.05mm) cluthc is only $30!

Lucky yanks...
If you were to work out the exchange rate, plus shipping to Australia, it wouldn't come out a hell of a lot cheaper, and considering my source is an importer, the difference would be their markup.

I got my Maxtorque 3/4 clutch for $75 AU; the shop probably imports it.

 

[thgrahamjr]

Go here and see if this helps, it's a pretty basic kart but you could get some ideas from it.
http://www.diygokarts.com/kart-plans/kart-plans-main.html