Polini 70 Evolution Kit for Booster/BW’S with Integrated Reed Valve

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  Polini 70 Evolution Kit for Booster/BW’S with Integrated Reed Valve

  The Polini Evolution 70cc cast iron cylinder kit is specifically designed for vertical Minarelli engines, such as MBK Booster and Yamaha BW'S

  - Reed valve housing integrated into the cylinder, with two dedicated ducts feeding the transfers for improved low-end torque
  - 4-petal reed valve included (compared to standard 2-petal) for faster, richer intake
  - Dedicated flow guide between intake manifold and reed valve to reduce turbulence and charge loss
  - 360° rotatable intake manifold, compatible with Polini CP carburetors from 17 to 24 mm (accepts OEM or open filters)
  - Racing head with copper gasket, dual-ring piston, and 0.2 / 0.3 mm base gaskets to adjust squish
  - 10 mm piston pin

  With a basic setup, the kit delivers around 14 real horsepower with a strong, linear torque curve across the full RPM range — clearly superior to traditional 70cc cast iron kits.

  RECOMMENDED SETUP:
  – Polini CP carburetor (19–24 mm)
  – Polini For Race or Scooter Team exhaust
  – Long gear transmission

  A Polini cylinder built for performance, without sacrificing low-end flexibility.

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