1 - Factory address is on there website you can get it from there.., but I think you can find a good bike from market too..
2 - registration is managed by retailer and take a week not buyers headache mostly.
3 - Lose nuts issue is even in japanese bikes too... so one has to get over it .. ride it nice in running period and get any losend nut tight as soon as you find one and bike will adjust itself with weeks ...
4 - mostly people dont like the plug, chain cover and Fuel Guage ... according to me as I have come acccross five 2012~2013 models... fuel gauge and Chain cover are now improved but plug is still chinese which mostly is what people replace to get more OOMPH!