I was asked a question today, what bike carbs will work in a downdraught set-up, I thought Suzuki tl, but they all seem to be injected.

Not many ports are truly verticle so what about a X cross manifold

Yamaha yzf600r are mounted almost vertically on the bike. Picture on here http://www.yzf600r.com/phpBB2/viewtopic.php?f=4&t=59919. I bought two sets to use on a v6 but never finished the project before moving on to the next.

Carbed R1s to 2001 were as vertical as you'll get.

fzr 1000 genesis without phill collins
VTR1000 firestorm

Yamaha XZ550K Vision, two mikuni's bolted together, looks like a down draft weber with air horns.

R1 mounted correctly are only about 45 degrees, what I would call semi downdraft..I tried to down load a picture but failed.....

http://www.boggbros.co.uk/gallery.html

jacko

CBR600 carbs are normally vertical, give or take 10 degrees or so. I use mine at about 10 degrees above horizontal - doesn't seem to bother them!