Yeah thats what I thought Barnone, I keep looking for anything on that 400 you posted in Gardos thread but didn't really find anything of use.

That being said what could be done to this motor to pep it up a little other than a freeflowing exhaust and a rejet. Can there be any gains with a better intake/air filter? Has anyone done any work to the head, cam, ignition in one of these?

I really don't understand all the EPA restrictions with motorcycles. In the US it is not a primary source of transportation plus the fact that it's a tiny single cyliner. Compared to our cars and trucks how much polution can that little sucker spew out? It's funny cause here in NJ you don't have to get your bike inspected anymore. Anything goes, loud pipes, no checking your exhaust gasses if it's within "spec", probably could just run with just a horn and headlight, no signals.

Forgive my ignorance with regards to these motors, this is all new to me, China bikes that is.