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"In March 1990, new standards were again introduced. An extra 110 cc were now allowed in a slightly larger (100 mm longer) bodyshell. These changes came at a time when the
Japanese economy was booming, so all manufacturers quickly developed new models to suit. The only 550 cc model to continue to be available for a while was the Mitsubishi Minica Dangan, which was only upsized five months later.[15] As a response to ever increasing power, a limit of 64 PS (47 kW; 63 hp) was also added. 64 PS happened to be the highest outputs to have been reached at the time, it is unknown if there are any other reasons that this number was selected. The regulation of horsepower has been suggested due to the fittment of turbochargers and superchargers to these tiny engines during the late 1980s in order to cope with the lack of horsepower and torque, and the installation of turbos and superchargers made the vehicles very fast and nimble relative to their size. Engine technology is also shared with Sport bikes, which are designed for rider enjoyment, and less so on fuel economy