Well that could be a very expensive venture. I'd suggest a strip, clean, and carefully measure everything to see if it still in tolerance before ordering anything up. By chance I have my Honda scooter apart with 45,000 miles on the clock as the motor seemed tired. I was going to pre-order new pistons and rings at some expense and possibly the valves too. In fact all I need are valve seals, a few other seals and gearbox bearings, and the tappets adjusting. The piston and rings and valves were perfect (still had machining marks on the piston wearing faces).

Stu