Social racing of pocket bikes - help please

Myself and some guys from work are considering buying pocket bikes. I'm not sure what's worthwhile. The local motorbike dealer says the cheap air cooled bikes sold on Ebay are rubbish. That maybe because he wants me to spent $1000 each and buy them off him. Are the air cooled bikes an adrenolin rush? Do the dirt bikes go rank in the dirt? Is there a huge amount of difference between air and water cooled bikes? What are they're suped up potentials?

wow 1k is alot for a air cooled cag coz u can probly get a brand new z1 from allballs racing for under 1k which is alot faster than a aircooled cag!

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selling pb and my bmx! pm me for more details and prices!

check out, www.ozminimoto.com.au
he has bike from $299
and f1 air or watercooled from $499
and original factory BLATA bikes fro $1650