Most of the ebay engines are Chinese ones. So far the cases we've seen suggest that the Chinese-made genuine Briggs engines are not yet as durable as the American Briggs engines we are used to. I haven't seen enough reports on Chinese-made genuine Hondas to reach a view on their quality. The unapproved Chinese copies of Briggs and Honda engines so far seem to have fairly serious issues that lead to short operating lives, or a lot of new parts, or both. They don't necessarily run badly when new, but there are reports of early problems with fuel system and ignition parts, and rapid wear on starters and engine controls. Most likely all this will be sorted out in due course and the engines will become desirable, but we don't seem to be there yet, based on the reports both here and on other sites.
There may be an alternative to buying a new clutch-half if your existing one, from the Kirby-Lauson, turns out to be 3/4" bore. You may be able to bush it down to 5/8", depending on whether it has a captive cotter pin or a key and grubscrew. However that kind of rework mostly appeals to people who have a lathe at home and enjoy making things.
