Can't say much about the N400 thus far. Too new to determine. But many of the KTM 390 owners I know do have issues -- mostly the early 2015 or 2016 models. Do a quick google check about RC390 or Duke 390 reliability and you'll find stuff about overheating, head gasket, etc.hey guys! i been trying to pick my first bike. i almost decided on a rc390 but then i noticed they are having a lot of issues. hows the 400's been so far, its the first year for them so is there any crazy "bugs"?