You can give a lowly 50cc Vespa a bit of extra pep with a big bore engine kit from Italian tuning firm Polini. This kit has a bore of 57.5mm, which, when combined with the standard 43mm stroke crankshaft, gives a far more lively 112cc. The kit consists of the cast iron cylinder, a new cylinder head, piston with rings and circlips, and a gasket set to seal it all up. It fits a wide range of 50cc Vespa machinery, including the three-wheeler Piaggio Apé. SRP is £168.
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