Ive got a mk1 , 2 ,3 piston for older dt. It has ports which should suck the mixture it quiclky, but the bottom of the piston is larger ,but aslong as it doesnt hit the bottom should be cool.
http://motorbike.performanceenginecomponents.com/products/product.asp?id=250848 closer piston to bore clearance, for more compression, polished crown, you would see awesome results with a stage 3 SS tune, i plan to do that with this piston.
Sorry mate but i need help aswell , gonna get another piston as the ring on that piston is not fitting right , and sure im not going to rip my cylinder for them.
I need a dt125r 2.00 os , would like a gd piston crnt find them any were , found one cheap one but thats a NONO no nono no dnt fck with my heart :)