Polini say their new 63mm aluminium cylinder kits for the Vespa PX 125/150 deliver reliable, consistent increases in power and improved service life.
Available in two displacements, with double-spark head and 8 connection points, newly re-designed transfers improve scavenging. Available with standard stroke of 57mm that gives 178cc displacement or a “racing” version with increased 60mm stroke for a displacement of 187cc, there is also a new balanced crankshaft available for the 60mm kit. The cylinder is air cooled, but thanks to the aluminium construction and the special design of the fins, the engine temperature remains lower.
The head is pre-configured for two spark plug holes, with the original lateral hole for an easier fitting or the “racing” central hole, which requires a slight modification of the shroud plastic. The Polini head has four additional mounting points for a stronger seal. The fins are bigger, for better heat dispersion, and the head gasket is produced with siliconised steel for the best seal between the head and cylinder.
Centering pins ensure a consistent squish band, the machined billet aluminium block has four connection points and the improved strength and seal optimises the exhaust flow and improves engine cooling.
Polini say that the latest design of their Evolution Hi-Speed 530 variator kit for the Yamaha T-Max 530 is a “masterpiece of technology, developed to maximise the performance of Yamaha’s maxi-scooter”.
The half pulley and the driven “Air Speed” half pulley are designed with different degrees to let the belt increase its speed; the compression spring, with anti-torsion EVO slider system, has a 34% increased load. Two series of lighter rollers are included in the package and a new patented lubricating system enables improved efficiency and performance with maximum reliability.
Also seen here is a new Maxi Hi-Speed variator for the Yamaha NMAX 125 that features the new lubricating system, a new polishing treatment for the sliding surfaces of the rollers, and a special tempered and ground case-hardened chrome-nickel steel bushing that allows constant grease distribution on the pin even during the hardest conditions of use. It is available with a compression spring which is 7% harder than stock and rollers with a coating made of a new mixture of nylon and aramidic fibres.
For E-bikes equipped with Bosch, Panasonic or Yamaha motors, the Polini Hi-Speed is an electronic device that allows the 25km/h limiter to be bypassed, increasing the pedal assist mode – keeping it active to 50 km/h. The connectors interface with the originals, maintaining the waterproof seal, and the assembly takes only a few minutes to install without opening the engine and without removing the original seals.
The device is completely invisible because it is housed in the interior space of the engine crankcase. It is completely reversible and you can return to the original configuration quickly, does not require any settings, is fully self-adjusting and self-recharging and it can be easily disconnected by unplugging the magneto placed outside the engine.
Finally, Polini “Black Collection” mufflers for the Sym GTS 125I Evo, Kawasaki J125, Kymco K-XCT 125i and Downtown 125I “feature a modern design, are very well finished and very reliable, and deliver increased power and response. Made of stainless steel, they include a lighter manifold than stock, which is ready to house the catalyser kit.
POLINI MOTORI SPA
www.polini.com
