New CDI

Hi everyone I am new to pocket bikes and i just purchased this CDI off ebay Race performance CDI 50cc-125cc dirt trail bike#MP527 (eBay item 290498088170 end time 08-May-11 13:31:20 AEST) : Cars, Bikes, Boats .. When i went to put it in, i realised that i couldnt find a previous CDI :S. I was wondering if it is possible to connect a CDI if there is none to begin with? And if you can, is it worth it? I tried to search for anything about CDI's and couldnt find anything.

This is the 49cc pocket bike i have.

NEW TUFFMOTO 49cc MINI MOTO DIRT TRAIL POCKET MINI BIKE (eBay item 350457788255 end time 26-Apr-11 18:00:10 AEST) : Cars, Bikes, Boats

this bike does not use a CDI box that you bought.

i like how its got a chain to drive a sprocket that then drives another chain.