Warmed up Revival
Pulled off side covers.
Removed Air Cleaner.
Removed all three screws, and drained the fluid.
Replaced lower drain screw and filled with Castrol Type F ATF until it started to drain out of the side screw hole.
Replaced and tighted all 3 screws
Replaced Air Cleaner and side cover
Drove for about 10 K no noticable difference.
Runs fine. Upshifts about 13 mph. But when decelerating or stopping at about 20 MPH until it down shifts to 1st at about 13, the Moped is jerky and shutters.
I am going to check the chain tension but I doubt that is it.
Local dealer (only one in about 200 miles) is a used car dealer and is absolutely no help.