I got back from Slovakia where I bought couple of 8th bore pistons.
I installed one to my Supreme w/207 motor- bored old cylinder from MopedJay to that size= 41mm and could report better low end than before.
so far breaking it in so can't tell how much of speed improvement.
basically it gained a little over 5 cc = about 11% so it is not 60 or 80cc as another brands kits give you, but still better...
see the pic, I am offering the kit= piston w /two rings, spare ring, piston pin, two clips and cylinder gasket
it fits to 210 too
you would have to get the cylinder bored on your own- I think mopedjay might have more for sale...
I want $38.- shipped, my PP is my email
also- few new thyristors and HD coils for sale