It seems I've now bored and honed a lot of cylinders over my lifetime. All types of pistons (cast iron cylinders). Clearances from .001-.002 or .0015-.002 or .002-.003 or .0035 to .0045 and all types of other weird combinations. The bigger the piston, the more clearance, unless it's made of bla bla bla bla . . . there are so many different combinations of materials, sizes and finish. It's really a delicate balance. Get the bore straight and the correct surface finish (60 degree cross hatch) . . . It's the most important part of the motorcycle engine(of any engine) - it's this cylinder and piston combination that endures the heat, the speed, the force, the fuel, the oil, the wear . . . it makes the power. If overlooked and not done correctly - performance and reliability will suffer.