Pop on decel CAN be from too lean condition. More capable others can weigh in, but I'm suspicious with aftermarket pipes, that you need to get your jet sizes right. There's lots online about doing that, but depends on how much you want to do yourself. The later model Honda bikes do have the valves (air cut-off, I think) that essentially stops deceleration popping sound, so not sure about your model year. Too lean can do damage so it's probably worth checking it out.
From the pics, that's a very clean looking '83. Congrats, looks like fun.
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