If the piston is new second hand as I suspect,I would as Spock says, use new rings,but if budget is lean, you could take the rings of the pistons, place them in the cylinder and check the end gaps. Use the piston to push the rings down the cylinder,about an inch,and make sure that the ring is level in the bore. Then use the ones with the narrowest gap. If a hone isn't available,use a bit of wet and dry sand paper and scuff it up in a circular motion.
Feeler gauges are the tool to measure the end gap, manual will tell you what the min and max gaps are. Cheers SpiritWalker.
Who walks into the Lions Den, and comes out alive?
12 inch apes
1986 A3 series 750
Slash cut stainless mufflers
170 rear tyre
Custom cyane blue paint, wheels included
Relocated regulator rectifier
Stainless washable oil filter
Six pack rack
LED indicators and flasher unit.
Oil pressure hot at 1000 rpm 20 psi, 4000 rpm 60 psi
Shows 67000 kms
Jets 38 idle Mains 120 changed to 40 idle 135 main.