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One of my little winter projects was modifying a 225 Lambretta cylinder with a boost port and piston window, then adding a reed block to the induction. also a 62 stroke 110mmm rod crank so 238cc, a packing plate under the cylinder to get the port timing and squish right . . . . add a 28mm Dellorto and big bore exhaust. changed the drive sprockets from 15/46 to 17/47 to get 4.7 overall ratio ( so 72mph @7000 rpm.) and fitted a 5 plate composite clutch.
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