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Option 1: Reinstall the old parts. If the clearance specifications are within recommended factory tolerances, you're safe to simply reassemble the upper end after cleaning and lubricating the parts. Option 2: Replace the rings only with a new ring set of the same size. If the clearances are toward the loose side of factory recommended tolerances, deglaze the cylinder with a hone, then install new rings. Option 3: Replace the Touring Bike Piston and rings with a new set of the same size. If the Touring Bike Piston is worn considerably and replacing it with the same size new Touring Bike Piston would decrease the clearance to factory tolerances again, you can save the cost of a bore job (up to $100.00 a hole) by this simple replacement. Again, you must deglaze the cylinder and use new rings. Option 4: Re-bore the cylinder, then install proper oversize Touring Bike Pistons and rings. To update an engine to peak performance, a bore job is called for. This requires re-machining the cylinder with a boring bar or special hone so it will accept a larger Touring Bike Piston. Always buy the new Touring Bike Piston first and take the Touring Bike Piston and cylinder to the machinist who is to do the job. Without the Touring Bike Piston, he can only guess how far to bore and hone the cylinder. If he has the Touring Bike Piston he can measure exactly.