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Model ID: DY322
The DY322 is a compact, high-efficiency cylinder head designed specifically for the rigorous demands of 70cc small-displacement engines (common in Cub-type motorcycles and scooters). Designing for a small bore requires a completely different engineering approach than larger engines; simply shrinking a larger design results in poor airflow. The DY322 features specially narrowed intake runners designed to accelerate intake air velocity. This high-speed airflow ensures that fuel is atomized perfectly even at low RPMs, providing the "snappy" throttle response and reliable idling essential for city stop-and-go riding.
Thermal management is equally critical in small engines that are often ridden at wide-open throttle for extended periods. The DY322 utilizes a high-density fin pattern that maximizes cooling surface area relative to the head's compact volume. We also employ a hardened valve seat alloy specifically chosen to resist the recession caused by unleaded fuels in high-temperature environments. This combination of fluid dynamics and robust materials delivers a cylinder head that maximizes fuel economy—often exceeding 100mpg—while maintaining the durability required for commercial delivery and daily transport applications.
