I have a 20hp briggs and stratton ohv v twin motor that will not run right. Unless choke is pulled out it will not idle.

Hi,
Sounds like a dirty fuel system to me. Also, suggest that you view the YouTube video on the adjustment of the valves on the model engine at:
Lawn Mower Repair Valve Adjustment V-Twin - YouTube (http://www.youtube.com/watch?v=hGkn0jR9RJM&feature=related)
And as the Internet is known to have, there is another site with a pictoral tutorial of the cleaning of your carb in two parts at:
Disassembly, Cleaning and Repair of Briggs Intek V-twin Two-Barrel Nikki Carburetor - Part 1 (http://outdoorpowerinfo.com/repairs/briggs_intek_v-twin_carb.asp)
And:
Disassembly, Cleaning and Repair of Briggs Intek V-twin Two-Barrel Nikki Carburetor - Part 2 (http://outdoorpowerinfo.com/repairs/briggs_intek_v-twin_carb2.asp)
Peace,
Clarke