Another vote here for staying away from Lil Red Barn parts. Not trying to bash the company, but I've had two engine refreshes (not full rebuild) in which we tried their pistons and rings and had engine noise after reassembly.
The fix was to install new OEM pistons and rings. They are expensive but if you can find them now, now is the time to buy. The CH18/20 pistons are NLA. Luckily, rods were a common component and are still available for a reasonable price.
I also replace the ignition coils on any engine refresh/rebuild.
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