KOLVSATS JE KTM520 20.5 97M 13:1
KTM 520-525 / 640 Custom Stroker Piston
97mm bore (3.819")
20,5mm Compression height (.807")
20mm pin (.787")
13:1 Compression
2,3mm dome, (.090")
Plese veryfy spec for your needs, we have no great records of the design for this piston
But we want to remember that this was a 520 RFS engiene with 78mm crank it would make a 576cc long stroke.