Once the piston leaves the cylinder it will need to be lightly honed, at the very minimum. Either leave the piston in place or pull two cylinder studs on the same side and you can split the cases with the piston left in place. Frankly, this is a good time to go through the engine. If you are capable of doing the teardown & reassembly, then you should be able to return the motor to mechanically new condition for around the same price of a PRC copy.
Trailbikes and dratv both sell decent bore-up kits and the cost is about the same as having your existing cylinder bored & honed, plus a piston kit. Those "too-good-to-be-true" dratv stock-type replacement heads are cheezy and have been known to have oil-control issues. A valve job shouldn't cost more than about $50, plus new valves & seals. You'll likely find a worn intake valve in yours.
The kickstart shaft is cheap enough. Replace the cam chain & plastic rollers, the clutch friction discs, seals, case & clutch cover screws, and any C-clips that were removed and for probably less than $350 in total parts (and valve job), you'll have returned your motor to factory-fresh mechanical condition.