320 is for sanding BALSA.

You take 320 to a chrome plated aluminum cylinder and you'll have the chrome so gouged up after 10 passes, it'll be ruined. You might not go through it in 10 passes, but I guarantee it'll be trashed within 10 seconds of firing it up with a new ring. That chrome will eat through the ring, and flake off, and grind itself into the piston, and behind the rings, and................ it'll just be a total disaster..........

Our model engines are not "honed" after the plating process. You ever had a brand new chrome plated engine apart? There ain't no dang cross hatches in that cylinder. It's mirror smooth. And there's no reason to "hone" or "scuff" or "knock the glaze off" ANY used cylinder with 320 grit paper for ANY reason...... EVER.

That might be "standard" procedure for ring replacement on a car engine with an iron cylinder, but NOT on a 2-stroke model engine with a chromed aluminum cylinder.

I'm tempted to edit or delete your posts because I KNOW your advice is poor and I don't want others to follow it. But just because I disagree with you doesn't make it right to delete your posts. FYI...... your advice is WRONG. DEAD WRONG.

If we were talking about an old iron cylinder, I might be inclined to agree with you. But this is a chromed cylinder. Bad advice. Very bad advice.