i guess if thats the attitude then why even bother with mopeds? For me its like haiku poetry, very specific format that enhances your creativity by forcing you to work with the constraints.
there are a lot of french 49cc bikes that will smoke anything you could ever dream of building in the 70cc range. I'm not assuming anything, my ciao is already faster than some kitted ciaos i've ridden, and the decomp valve is shot, its going to be darn zippy when i get that fixed.
no replacement for displacement is what mustang and camaro guys with 5 liter engines say right before getting schooled by 1.8 liter hondas. there is a replacement for displacement, its called volumetric efficiency. Plus, i'd rather spend time tuning than working... its just way more fun. But you are right, to each his own.
by the way, are you guys participating in the 50cc stock cylinder build off? I might take a trip down for that.