Advice vs pros and cons of engine flush

Lifter Ticking is good when it's normal. Cuz then, when the ticking changes, you know something is wrong. lol.
Most of my old Mopes, over the years, were tickers, and I let them. It makes for low-rpm torque. until the tick changes, then I suspect a lobe going down, and start hunting for it.
But, if the tick is not a lifter, well, you better go investigate.

As regards flushing, I've only ever done it one time, and I guess it promptly filled the oil pick-up with debris, and a few miles later, the engine went down. So, notta chance would I recommend it. But, you can put a partial load of CC cleaner in there and pile on some miles. See what happens.