I was walking near my house. Japan is a great place to walk even at night. While I was coming back from a walk I passed a motorcycle shop. It was painted with bright yellow paint. It had signs for the biggest motorcycle makers in Japan.
My guess is Honda is the biggest followed by Yamaha. I have a Yamaha which I like. The other two lesser makers are Suzuki and Kawasaki. All throughout the city there are small bike shops. This is probably because 50 cc scooters need a placed to be sold and repaired. There are a lot of these on the road.
My Yamaha dealer is YSP. That is for Yamaha Sports Plaza. There are apparently Yamaha Area Service Shops. These are lesser shops and not so connected to Yamaha. Honda also has Honda Dream shops which are big.
Area Service Shop.