The New Billet Downdraft Carb for Kohler V-Twin motors 1.200" with a 1.530" butterfly size.  Accepts a 2 1/2"  clamp on air cleaner.  Universal bolt pattern to bolt directly to the plastice intake (our part # 52989 or preferred fuel injection manifold our part # 51580) Uses common Holley parts, comes with the #90 jet installed, the side hung holley float, air bleeds. Comes with a  brass needle & seat.  Run at 2-3# of fuel pressure.  This can be converted to methanol, but will require rejetting of the carb. 

If you have a stock governed motor with stock sized valves with a mechanical governor, you will need to fabricate linkages for proper operation. If you have larger valves and done a valve job you will see a difference.