Highway 9 should be all asphalt.
BobS was out there last year & should be able to give you some more info, including travel times.
To get your bike across the Mekong River you need to put it in a boat, get on one of the big vehicle ferries that go over.
If the bike is in your name should be no trouble to get out of Thailand / into Laos.
Suggest you take a look at
https://www.gt-rider.com/crossingborders.html
for some more info.
Also take a look at the good Bat reports
http://board.gt-rider.com/topic.asp?TOP ... hichpage=1
and
http://board.gt-rider.com/topic.asp?TOP ... hichpage=1
Davidfl
Keep the power on