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When evaluating the sound generated by PWC (personal water craft), it is essential to study the measurement method for the PWC sound itself. However, it is equally important to identify the influence on the people in the neighbor of shoreline by being exposed to the sound from a group of PWC running around on waters. Such influence can be grasped in relation to the results of sensory evaluation. LAeq (equivalent continuous A-weighted sound level) was measured on PWC's running in various patterns and different numbers, while sensory evaluation was performed to obtain the data for the feelings the exposed persons would have about the sound. In this way the correlation between the sound pressure level and its perception by the people were analyzed. LAeq is the mixture of natural sound at the test site and the sound from the PWC(s) running in the predetermined patterns.

Most currently produced lean-burn engines can achieve good fuel economy, but must be further developed to gain better vehicle performance and driveability. Honda has developed a new lean-burn engine which incorporates 3-stage variable valve timing and lift mechanism, swirl promotion at low engine speed, and a new intake port configuration. This engine generates approximately 40% more power over our current lean burn engine and improves the dynamic performance of the vehicle. At the same time, it maintains a fuel consumption level equal to that of the current engine.