Polini 12 mm kits for Yamaha Minarelli models
Italian specialist Polini Motori has added to its range of upgrade, service and repair products for Yamaha scooters equipped with Minarelli engines (CY, MY, CW models) with this new 'Polini For Race' 12 mm crankshaft.
Designed, engineered and tested to improve and increase performance and durability, the billet aluminium, precision CNC-machined connecting rod can be used with 12 mm special pistons as an alternative to the original 10 mm piston pin. They are equipped with the connecting rod to be installed with the new improved piston pins.
"Perfectly balanced to reduce vibrations and power loss, they are thermically treated to increase their resistance. These 'Polini For Race' 12 mm crankshafts are designed for use with the cast iron 40 cc/70 cc cylinder kits in up to 14 hp applications. Available for horizontal and vertical applications".
Polini Motori is also announcing a new range of street and racing cylinder kits for the 12 mm CY, MY, and CW Minarelli engines that include a precision-machined cast iron cylinder with improved, reduced friction cylinder-piston sliding. The exhaust ports have been designed to work in line both with the Polini original and Scooter Team mufflers. The racing version has been designed to achieve racing performance and to work in line both with the Polini original and Scooter Team mufflers.
The piston is made from a high-grade, high silicon content alloy for maximum heat tolerance. The piston rings are made of strong, high carbon content and improved machining capacity spheroidal cast iron, which is highly resistant to wear, rebored and lapped.
The head is made in a special lightweight aluminium alloy with a high coefficient of heat exchange. The combustion chamber has been completely redesigned for a high compression ratio.
Polini cylinder kits for Yamaha Minarelli engines must be installed together with the crankshafts with connecting rods for 12 mm piston pins.
POLINI MOTORI SPA
