Actually you can use the Dragstar 650 manual, it is almost same bike. You can actually convert the Dragstar 400 to 650 pretty easy.
Just a tip, the bike has also been sold as Yamaha Vstar 400 / 650 in some countries.
NorThai you around Khon Kaen I assume... I might be up a trip when I get home to say hello to John Gooding and Marco with his huge tank of a bike and do a ride. Have to let John test my Yammie, and have a fun time up in Isaan again. You should join for a ride and some nice scenery... What do you say Marco up for a tour to Chiang Mai maybe from Khon Kaen, meet up with NorThai, pick up you and go up and meet up with the fellers in Chiang Mai?
Tony will probably join, and maybe get Neng and Peter Dougal with me???
Cheers Bard