Light weight, compactness and high power are the important characteristics of a motorcycle engine. Sufficient torque and response at low and middle speeds are required to enhance the drivability of a motorcycle. Recently, the global environmental problem has created a cry for resource and energy conservation. This has increased the needs for low fuel consumption engines.
Traditionally, Yamaha has employed the policy of placing importance on global environment as one of its management philosophies and challenged the development of various technologies. Among them is a technology (YTIS: Yamaha Tumble Induction Control System) which stabilizes combustion on a compact engine and attains both low fuel consumption and high performance at a time.
This technology creates tumble flow by the use of variable area intake ports and generates strong intake gas flow at a normal speed range, and thus achieves low fuel consumption by improving combustion with the generated strong intake gas flow, while it does not sacrifice the performance at high speeds. The technology also enables both low fuel consumption and good exhaust gas quality and in addition, it improves the drivability of a motorcycle. Attention should be paid to the fact that the effect provided by this technology is produced by an action other than that found when tumble flow is generated by modifying the port shape alone.
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