umm, that is about as likely as turning a 2 stroke OS into a 4 stroke YS. they are different engines, the parts are different, and even if there is ANY overlap of common parts, it isn't a single part that makes it perform like a saito, it is the entire engine. besides, an asp 70 is closest to an os 70, not a saito.

besides, have you looked at the price of individual parts? it won't take long before you are WAY over the cost of the better engine anyway.