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In contrast to other cylinders, the openings of the overflow channels in the cylinder base are already open. This requires adjusting the fan duct on the stator housing (explained in the instructions supplied with the cylinder). The cylinder base has a diameter of 61.3mm, so it is not necessary to enlarge the cylinder base bore in the engine housing.
The one-piece diffuser is manufactured with a width of around 66% towards durability. However, we would assume that the Zuera 135SS, due to the much more sporty exhaust geometry, is slightly above the Polini Evolution I in terms of performance.
Due to the angles of the overcurrent channels facing the exhaust, the Zuera 135SS certainly also supports exhaust systems that like to reach into higher speed regions.
Pinasco''s recommended pinch edge of 1 mm, recommended by Pinasco0 - 1.1mm can be adjusted using the 3 0.1mm cylinder base gaskets supplied. When it comes to cylinder-head gaskets, Pinasco is discreetly reticent, also with regard to the gasket and the connection to the exhaust. An exhaust gasket suitable for the Zuera SS135 is not included, nor are the required exhaust studs.
The PK125 exhaust gasket from Piaggio fits the flange. However, the outlet of the SS135 has a dimension of 35mm x 30mm. Therefore the PK125 exhaust gasket is not quite suitable due to the smaller inner diameter. Alternatively, you can also use the BGM exhaust gasket.
The bottom line is that Pinasco has created a sporty cylinder that offers good performance with little effort. Whether with SHB19, Polini CP carburettors and Piaggio or Polini banana or with a Keihin 28 and a Franz - the Pinasco SS135 can be elicited by the suitable environment of carburettor and exhaust, power ranges from moderate to sporty.
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