Hi mate try the following links:
dhz Mini Bikes | Pitbikes | Dirt Bike Parts & Accessories | DHZ Mini Moto | Buy Online Australia
Fire power minis http://www.firepowerminis.com/index.html
Carby: Mikuni 24mm or 26mm about %150 +p&h
Exhaust: fmf power core 4 about $180 +p&h
Bore: not quiet sure...