Motorrock in Japan makes some nice bikes, mostly SR400s and W650s.
They have some really nice parts as well.
Another cool company is Berry Bads Motorcycle.
Check out first the SR400 and then the W650.
These are without any question the most popular Japanese bikes to modify.
Well, still waiting for my shims, so no work done on my bike.
So get out and drive your bike this weekend, and if you can´t be good, be careful.
Remember, all other drivers are blind idiots and you are invisible.