The 170cc cylinder is made of a special cast alloy and therefore even more wear-resistant and durable than the standard cylinder. The workmanship is typical Polini at a very high level.
The saturated increase in displacement brings a significant increase in power and torque and therefore a significant improvement of the driving values. The compression ratio has been increased to 11.2:1, thus contributing significantly to the achievement of sporty driving values. Polini states the increase in power, compared to the 125 Majesty, at about 60%.
After high mileage or a defect, the cylinder bore can be ground out and by means of an oversize piston the cylinder can then be restored to a new condition.
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