I am the proud new owner of a 1981 vespa si that i culled from a trash cleanup pile by my house. the moped is all there except for the variator and the engine/crankcase/carb. i am guessing they pulled the engine out and never got around to putting it back in. who knows. anyway, can anyone out there direct me on what and where to buy a good engine and variator for this bike? i have been looking at these polini parts but i do not know what fits what bikes (if only i could speak italian or dutch) i am willing to spend about $500 or so, and i would like the moped to go at least 40mph (if possible) anybody know of a place to get a beastly engine for this moped?