Hi there,
MX bikes are available in Japan in all sizes from 80-250cc. Bigger bikes are not popular and it is very difficult obtain. Naturally most of the MX's here are Japanese made and we seldom see an Aprilia, KTM etc.
The 125 and 250cc are the popular classes and these bikes can be found in relatively good condition, especially if they are newer models.
We buy these bikes from riders and at the bike auctions. Since there aren't that many of them, they take time to collect should you need more than one bike.
Parts are available for all Japanese makes and sizes. Please use parts number whenever possible and please give us your bike's frame number so that we can be sure we quote the correct year.