Wossner Pistons have become our top choice at True Tech due to their quality, availability and customer support. This piston fits all KTM 300 models from 2006 to current. Size A is 71.94mm and size B is 71.95mm.
Always verify your piston clearance and ring end gap by measuring! Never assume!
Here is a video on how and why, and one on how pistons are sized.