fether=vogelfeder
was du meinst ist "spring"
in addition to the problems:
i do not exactly know HOW sluggish you baby is, but an automatic is always way sluggier than the handshifted models.
to the starting problem:
have you tried the standards:
-brakecleaner spray into the air-intake (faster start then?)
-what colour does the spark plug have?
the wheighs, you reduced, make the transmission way shorter. the reduction you made is not very much, but i must admit, i do not have an automatic
one thing i didn't get is:
when you start your vespa, it accelerates, stops accelerating, and then goes on? when reducing wheighs you need more engine-RPM to accelerate.