Every jap bike I've owned in the last nineteen years has had problems.
1971 Honda CB350: drum brakes worked once then faded real bad, points bounced, leaked oil a little, electrics were crummy.
1985 Suzuki GS550ES: rear brake wasn't porperly adjusted by the dealer, ruined the disk (bike got stolen so it didn't matter)
1987 Kawasaki EX250: bad electrical parts.
1992 Yamaha XT600: Valve cover cracked just after the factory warranty expired, leaked oil everywhere. Bad electrics.Brakes suck.
1995 Kawasaki KLR650: Broken motor mounts at around 35000 miles.Brakes suck. Gas tank replaced under warrenty, bad leak. Faulty electrics
1998 Suzuki GSF1200S Bandit: Leaked oil right after I got it, gas tank leaked right after I got it. Both fixed under warrenty. Bad electrics replaced under warrenty. Speedometer went bad at 17000 miles, warrenty replaced. Valve cover still leaks a little oil, but I don't care anymore. Gas guage don't work anymore, another warrenty fix
ALL of my motorcycles have failed to run at one point or another due to faulty electrics.
My next bike might be a Buell.