Dave. . . Did you put the pump together using assembly lube so you'll have some suction to pull oil on initial cranking?
There was a time that scooters didn't have significant oil pressure at an idle.replaced cam plate. Put engine back together. Start engine oil lite is on(no pressure). pretty good tapping noise. rockers appear to not be gewtting any oil. will check oil pump next. Top 3 reasons for not oiling are.....?