FALICON USA Stroker Crank 4.6mm for your ZX12, I imported the crank for USD$1 850 plus freight & vat. With STD pistons your ZX12 equates to a 1299cc powerhouse. Used with 2mm o/size 85mm pistons gets you a 1362cc monster engine. Use Carillo Rods or OEM Rods with a spacer plate under the cylinder/ The ZX12 is a very popular engine for modifications, speak to Piet at Pietspoed Workshop for further info and advice. He's been in the performance industry for 45yrs.