I recently bought my first moped, a 1977 Puch Newport. After cleaning out the cylinder, carb, and exhaust, replacing the spark plug, and replacing the transmission fluid (among other things), I just started it for the first time today. It's a bit finicky at this point, but I can get it to run. The main issue is that the centrifugal clutch doesn't engage, so I have to keep the starter clutch lever depressed in order for it to keep running and not conk out.
Before I dive in and start looking around the clutch for potential problems, does anyone have any suggestions as to what could be causing this? Anything in particular I should be looking out for when I open it up?