Despite brisk business in the global market, Japanese motorcycle makers have for years watched their domestic sales slide.

With few signs of improvement, Honda Motor Co., Kawasaki Heavy Industries, Ltd., Suzuki Motor Corp. and Yamaha Motor Co. have recently started taking measures to reverse the downward trend. The four motorcycle makers launched a joint campaign this summer, holding special events and carrying joint advertisements.

Some experts say the manufacturers and their dealers need to upgrade their marketing strategies and promote their products as tools of leisure.