Re: I only want one chain!! help !!
I think that would be a "scooter" or "motorcycle".
But in the off chance that you may be referring to jack shafts and shift kits, you will find they use three: one from engine to jack shaft, one from far-side of jack shaft to front pedal sprocket, then the standard chain that runs from pedal sprocket to rear wheel sprocket. Sick Bike Parts has these kits. He has quality parts. Research a bit to be sure it is what you want.
"There is nothing wrong with wanting a motorbike that is an extension of your personal taste and fashion sense; if you must ride somewhere, I say do it with style