Piston Size Choice

Currently rebuilding WR250. Have a bore measurement of 66.35 mm and trying to figure what size piston I need and which size from the Husky parts catalogue. I realise I need a 0.040 - 0.060mm clearance but which piston is this since the parts catalogue lists 3 diameter ie 64.345 - 64.355 etc. Is this number listed the cylinder bore measurement or the actual piston?

look on the bottom of the cylinder ( base gasket surface ) for a letter a thru f, this will tell you which piston to use. If your motor is wore out you may need a replate and piston.

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