There’s no replacement for displacement when it comes to tuning engines, and the biggest gains come from smaller motors, as the percentage increase in swept volume is so much greater. To that end, the performance of a Vespa PX125 or 150 can now be improved with a 177cc alloy cylinder kit from VMC. The Nikasil-plated cylinder is given a 63mm bore which, when used with a standard 57mm crankshaft, gives the declared displacement. It uses a seven-port design with a boosted exhaust port (a large main exhaust port with a pair of smaller boost ports either side). A Meteor double-ring piston, aluminium head with eight fixing points and all gaskets are included for the £252 SRP.
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