XJR400 INFORMATION

I may have found the wrong forum but I am looking to buy parts for my Yamaha XJR400 from Japan, ie

Uprated carburettor kit
530cc engine capacity increase kit
Performance exhaust

Can anybody point me in the correct direction eithet another forum or a retail outlet.

Webike Japan have not been helpful so far.

Also any Japanese XJR400 owners please contact me to swap storys.

Best Regards

Paul